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slords |
1.1.2.1 |
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| 2 |
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https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2012-0057 |
| 3 |
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| 4 |
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http://git.php.net/?p=php-src.git;a=commitdiff;h=b2287a42a0dfd8fe392051d8f25531051cd86322 |
| 5 |
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http://git.php.net/?p=php-src.git;a=commitdiff;h=192511f75d915c723384da17b6ca265971727132 |
| 6 |
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http://git.php.net/?p=php-src.git;a=commitdiff;h=c9b5d92821db7335632f8578871e2b75ac018f2a |
| 7 |
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http://git.php.net/?p=php-src.git;a=commitdiff;h=777a29fce22a741fedb69c83c3e7c2129372ee0e |
| 8 |
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| 9 |
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--- php-5.3.3/ext/xsl/php_xsl.c.cve0057 |
| 10 |
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+++ php-5.3.3/ext/xsl/php_xsl.c |
| 11 |
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@@ -141,6 +141,13 @@ zend_object_value xsl_objects_new(zend_c |
| 12 |
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} |
| 13 |
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/* }}} */ |
| 14 |
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| 15 |
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+PHP_INI_BEGIN() |
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+/* Default is not allowing any write operations. |
| 17 |
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+ XSL_SECPREF_CREATE_DIRECTORY | XSL_SECPREF_WRITE_NETWORK | XSL_SECPREF_WRITE_FILE == 44 |
| 18 |
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+*/ |
| 19 |
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+PHP_INI_ENTRY("xsl.security_prefs", "44", PHP_INI_ALL, NULL) |
| 20 |
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+PHP_INI_END() |
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+ |
| 22 |
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/* {{{ PHP_MINIT_FUNCTION |
| 23 |
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*/ |
| 24 |
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PHP_MINIT_FUNCTION(xsl) |
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@@ -167,6 +174,14 @@ PHP_MINIT_FUNCTION(xsl) |
| 26 |
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REGISTER_LONG_CONSTANT("XSL_CLONE_NEVER", -1, CONST_CS | CONST_PERSISTENT); |
| 27 |
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REGISTER_LONG_CONSTANT("XSL_CLONE_ALWAYS", 1, CONST_CS | CONST_PERSISTENT); |
| 28 |
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| 29 |
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+ REGISTER_LONG_CONSTANT("XSL_SECPREF_NONE", XSL_SECPREF_NONE, CONST_CS | CONST_PERSISTENT); |
| 30 |
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+ REGISTER_LONG_CONSTANT("XSL_SECPREF_READ_FILE", XSL_SECPREF_READ_FILE, CONST_CS | CONST_PERSISTENT); |
| 31 |
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+ REGISTER_LONG_CONSTANT("XSL_SECPREF_WRITE_FILE", XSL_SECPREF_WRITE_FILE, CONST_CS | CONST_PERSISTENT); |
| 32 |
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+ REGISTER_LONG_CONSTANT("XSL_SECPREF_CREATE_DIRECTORY", XSL_SECPREF_CREATE_DIRECTORY, CONST_CS | CONST_PERSISTENT); |
| 33 |
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+ REGISTER_LONG_CONSTANT("XSL_SECPREF_READ_NETWORK", XSL_SECPREF_READ_NETWORK, CONST_CS | CONST_PERSISTENT); |
| 34 |
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+ REGISTER_LONG_CONSTANT("XSL_SECPREF_WRITE_NETWORK", XSL_SECPREF_WRITE_NETWORK, CONST_CS | CONST_PERSISTENT); |
| 35 |
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+ REGISTER_LONG_CONSTANT("XSL_SECPREF_DEFAULT", XSL_SECPREF_DEFAULT, CONST_CS | CONST_PERSISTENT); |
| 36 |
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+ |
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REGISTER_LONG_CONSTANT("LIBXSLT_VERSION", LIBXSLT_VERSION, CONST_CS | CONST_PERSISTENT); |
| 38 |
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REGISTER_STRING_CONSTANT("LIBXSLT_DOTTED_VERSION", LIBXSLT_DOTTED_VERSION, CONST_CS | CONST_PERSISTENT); |
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@@ -175,6 +190,8 @@ PHP_MINIT_FUNCTION(xsl) |
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REGISTER_STRING_CONSTANT("LIBEXSLT_DOTTED_VERSION", LIBEXSLT_DOTTED_VERSION, CONST_CS | CONST_PERSISTENT); |
| 42 |
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#endif |
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| 44 |
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+ REGISTER_INI_ENTRIES(); |
| 45 |
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+ |
| 46 |
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return SUCCESS; |
| 47 |
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} |
| 48 |
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/* }}} */ |
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@@ -258,6 +275,8 @@ PHP_MSHUTDOWN_FUNCTION(xsl) |
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xsltCleanupGlobals(); |
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+ UNREGISTER_INI_ENTRIES(); |
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+ |
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return SUCCESS; |
| 56 |
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} |
| 57 |
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/* }}} */ |
| 58 |
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--- php-5.3.3/ext/xsl/php_xsl.h.cve0057 |
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+++ php-5.3.3/ext/xsl/php_xsl.h |
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@@ -32,6 +32,7 @@ extern zend_module_entry xsl_module_entr |
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#include <libxslt/xsltInternals.h> |
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#include <libxslt/xsltutils.h> |
| 63 |
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#include <libxslt/transform.h> |
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+#include <libxslt/security.h> |
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#if HAVE_XSL_EXSLT |
| 66 |
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#include <libexslt/exslt.h> |
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#include <libexslt/exsltconfig.h> |
| 68 |
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@@ -43,6 +44,15 @@ extern zend_module_entry xsl_module_entr |
| 69 |
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#include <libxslt/extensions.h> |
| 70 |
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#include <libxml/xpathInternals.h> |
| 71 |
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| 72 |
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+#define XSL_SECPREF_NONE 0 |
| 73 |
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+#define XSL_SECPREF_READ_FILE 2 |
| 74 |
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+#define XSL_SECPREF_WRITE_FILE 4 |
| 75 |
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+#define XSL_SECPREF_CREATE_DIRECTORY 8 |
| 76 |
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+#define XSL_SECPREF_READ_NETWORK 16 |
| 77 |
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+#define XSL_SECPREF_WRITE_NETWORK 32 |
| 78 |
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+/* Default == disable all write access == XSL_SECPREF_WRITE_NETWORK | XSL_SECPREF_CREATE_DIRECTORY | XSL_SECPREF_WRITE_FILE */ |
| 79 |
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+#define XSL_SECPREF_DEFAULT 44 |
| 80 |
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+ |
| 81 |
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typedef struct _xsl_object { |
| 82 |
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zend_object std; |
| 83 |
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void *ptr; |
| 84 |
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--- php-5.3.3/ext/xsl/tests/bug54446.phpt.cve0057 |
| 85 |
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+++ php-5.3.3/ext/xsl/tests/bug54446.phpt |
| 86 |
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@@ -0,0 +1,95 @@ |
| 87 |
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+--TEST-- |
| 88 |
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+Bug #54446 (Arbitrary file creation via libxslt 'output' extension) |
| 89 |
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+--SKIPIF-- |
| 90 |
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+<?php |
| 91 |
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+if (!extension_loaded('xsl')) die("skip Extension XSL is required\n"); |
| 92 |
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+?> |
| 93 |
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+--FILE-- |
| 94 |
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+<?php |
| 95 |
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+include("prepare.inc"); |
| 96 |
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+ |
| 97 |
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+$outputfile = dirname(__FILE__)."/bug54446test.txt"; |
| 98 |
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+if (file_exists($outputfile)) { |
| 99 |
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+ unlink($outputfile); |
| 100 |
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+} |
| 101 |
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+ |
| 102 |
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+$sXsl = <<<EOT |
| 103 |
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+<xsl:stylesheet version="1.0" |
| 104 |
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+ xmlns:xsl="http://www.w3.org/1999/XSL/Transform" |
| 105 |
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+ xmlns:sax="http://icl.com/saxon" |
| 106 |
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+ extension-element-prefixes="sax"> |
| 107 |
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+ |
| 108 |
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+ <xsl:template match="/"> |
| 109 |
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+ <sax:output href="$outputfile" method="text"> |
| 110 |
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+ <xsl:value-of select="'0wn3d via PHP and libxslt ...'"/> |
| 111 |
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+ </sax:output> |
| 112 |
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+ </xsl:template> |
| 113 |
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+ |
| 114 |
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+</xsl:stylesheet> |
| 115 |
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+EOT; |
| 116 |
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+ |
| 117 |
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+$xsl->loadXML( $sXsl ); |
| 118 |
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+ |
| 119 |
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+# START XSLT |
| 120 |
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+$proc->importStylesheet( $xsl ); |
| 121 |
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+ |
| 122 |
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+# TRASNFORM & PRINT |
| 123 |
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+print $proc->transformToXML( $dom ); |
| 124 |
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+ |
| 125 |
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+ |
| 126 |
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+if (file_exists($outputfile)) { |
| 127 |
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+ print "$outputfile exists, but shouldn't!\n"; |
| 128 |
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+} else { |
| 129 |
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+ print "OK, no file created\n"; |
| 130 |
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+} |
| 131 |
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+ |
| 132 |
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+#SET NO SECURITY PREFS |
| 133 |
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+ini_set("xsl.security_prefs", XSL_SECPREF_NONE); |
| 134 |
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+ |
| 135 |
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+# TRASNFORM & PRINT |
| 136 |
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+print $proc->transformToXML( $dom ); |
| 137 |
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+ |
| 138 |
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+ |
| 139 |
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+if (file_exists($outputfile)) { |
| 140 |
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+ print "OK, file exists\n"; |
| 141 |
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+} else { |
| 142 |
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+ print "$outputfile doesn't exist, but should!\n"; |
| 143 |
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+} |
| 144 |
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+ |
| 145 |
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+unlink($outputfile); |
| 146 |
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+ |
| 147 |
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+#SET SECURITY PREFS AGAIN |
| 148 |
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+ini_set("xsl.security_prefs", XSL_SECPREF_WRITE_FILE | XSL_SECPREF_WRITE_NETWORK | XSL_SECPREF_CREATE_DIRECTORY); |
| 149 |
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+ |
| 150 |
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+# TRASNFORM & PRINT |
| 151 |
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+print $proc->transformToXML( $dom ); |
| 152 |
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+ |
| 153 |
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+if (file_exists($outputfile)) { |
| 154 |
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+ print "$outputfile exists, but shouldn't!\n"; |
| 155 |
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+} else { |
| 156 |
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+ print "OK, no file created\n"; |
| 157 |
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+} |
| 158 |
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+ |
| 159 |
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+ |
| 160 |
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+--EXPECTF-- |
| 161 |
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+Warning: XSLTProcessor::transformToXml(): runtime error: file %s line %s element output in %s on line %d |
| 162 |
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+ |
| 163 |
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+Warning: XSLTProcessor::transformToXml(): File write for %s/bug54446test.txt refused in %s on line %s |
| 164 |
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+ |
| 165 |
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+Warning: XSLTProcessor::transformToXml(): runtime error: file %s line %d element output in %s on line %d |
| 166 |
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+ |
| 167 |
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+Warning: XSLTProcessor::transformToXml(): xsltDocumentElem: write rights for %s/bug54446test.txt denied in %s on line %d |
| 168 |
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+OK, no file created |
| 169 |
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+OK, file exists |
| 170 |
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+ |
| 171 |
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+Warning: XSLTProcessor::transformToXml(): runtime error: file %s line %s element output in %s on line %d |
| 172 |
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+ |
| 173 |
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+Warning: XSLTProcessor::transformToXml(): File write for %s/bug54446test.txt refused in %s on line %s |
| 174 |
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+ |
| 175 |
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+Warning: XSLTProcessor::transformToXml(): runtime error: file %s line %d element output in %s on line %d |
| 176 |
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+ |
| 177 |
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+Warning: XSLTProcessor::transformToXml(): xsltDocumentElem: write rights for %s/bug54446test.txt denied in %s on line %d |
| 178 |
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+OK, no file created |
| 179 |
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+--CREDITS-- |
| 180 |
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+Christian Stocker, chregu@php.net |
| 181 |
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+ |
| 182 |
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--- php-5.3.3/ext/xsl/tests/bug54446_with_ini.phpt.cve0057 |
| 183 |
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+++ php-5.3.3/ext/xsl/tests/bug54446_with_ini.phpt |
| 184 |
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@@ -0,0 +1,95 @@ |
| 185 |
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+--TEST-- |
| 186 |
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+Bug #54446 (Arbitrary file creation via libxslt 'output' extension with php.ini setting) |
| 187 |
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+--SKIPIF-- |
| 188 |
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+<?php |
| 189 |
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+if (!extension_loaded('xsl')) die("skip Extension XSL is required\n"); |
| 190 |
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+?> |
| 191 |
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+--FILE-- |
| 192 |
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+<?php |
| 193 |
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+include("prepare.inc"); |
| 194 |
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+ |
| 195 |
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+$outputfile = dirname(__FILE__)."/bug54446test.txt"; |
| 196 |
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+if (file_exists($outputfile)) { |
| 197 |
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+ unlink($outputfile); |
| 198 |
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+} |
| 199 |
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+ |
| 200 |
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+$sXsl = <<<EOT |
| 201 |
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+<xsl:stylesheet version="1.0" |
| 202 |
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+ xmlns:xsl="http://www.w3.org/1999/XSL/Transform" |
| 203 |
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+ xmlns:sax="http://icl.com/saxon" |
| 204 |
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+ extension-element-prefixes="sax"> |
| 205 |
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+ |
| 206 |
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+ <xsl:template match="/"> |
| 207 |
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+ <sax:output href="$outputfile" method="text"> |
| 208 |
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+ <xsl:value-of select="'0wn3d via PHP and libxslt ...'"/> |
| 209 |
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+ </sax:output> |
| 210 |
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+ </xsl:template> |
| 211 |
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+ |
| 212 |
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+</xsl:stylesheet> |
| 213 |
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+EOT; |
| 214 |
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+ |
| 215 |
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+$xsl->loadXML( $sXsl ); |
| 216 |
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+ |
| 217 |
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+# START XSLT |
| 218 |
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+$proc->importStylesheet( $xsl ); |
| 219 |
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+ |
| 220 |
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+# TRASNFORM & PRINT |
| 221 |
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+print $proc->transformToXML( $dom ); |
| 222 |
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+ |
| 223 |
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+ |
| 224 |
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+if (file_exists($outputfile)) { |
| 225 |
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+ print "$outputfile exists, but shouldn't!\n"; |
| 226 |
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+} else { |
| 227 |
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+ print "OK, no file created\n"; |
| 228 |
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+} |
| 229 |
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+ |
| 230 |
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+#SET NO SECURITY PREFS |
| 231 |
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+ini_set("xsl.security_prefs", XSL_SECPREF_NONE); |
| 232 |
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+ |
| 233 |
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+# TRASNFORM & PRINT |
| 234 |
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+print $proc->transformToXML( $dom ); |
| 235 |
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+ |
| 236 |
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+ |
| 237 |
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+if (file_exists($outputfile)) { |
| 238 |
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+ print "OK, file exists\n"; |
| 239 |
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+} else { |
| 240 |
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+ print "$outputfile doesn't exist, but should!\n"; |
| 241 |
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+} |
| 242 |
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+ |
| 243 |
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+unlink($outputfile); |
| 244 |
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+ |
| 245 |
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+#SET SECURITY PREFS AGAIN |
| 246 |
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+ini_set("xsl.security_prefs", XSL_SECPREF_WRITE_FILE | XSL_SECPREF_WRITE_NETWORK | XSL_SECPREF_CREATE_DIRECTORY); |
| 247 |
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+ |
| 248 |
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+# TRASNFORM & PRINT |
| 249 |
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+print $proc->transformToXML( $dom ); |
| 250 |
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+ |
| 251 |
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+if (file_exists($outputfile)) { |
| 252 |
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+ print "$outputfile exists, but shouldn't!\n"; |
| 253 |
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+} else { |
| 254 |
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+ print "OK, no file created\n"; |
| 255 |
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+} |
| 256 |
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+ |
| 257 |
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+ |
| 258 |
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+--EXPECTF-- |
| 259 |
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+Warning: XSLTProcessor::transformToXml(): runtime error: file %s line %s element output in %s on line %d |
| 260 |
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+ |
| 261 |
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+Warning: XSLTProcessor::transformToXml(): File write for %s/bug54446test.txt refused in %s on line %s |
| 262 |
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+ |
| 263 |
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+Warning: XSLTProcessor::transformToXml(): runtime error: file %s line %d element output in %s on line %d |
| 264 |
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+ |
| 265 |
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+Warning: XSLTProcessor::transformToXml(): xsltDocumentElem: write rights for %s/bug54446test.txt denied in %s on line %d |
| 266 |
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+OK, no file created |
| 267 |
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+OK, file exists |
| 268 |
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+ |
| 269 |
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+Warning: XSLTProcessor::transformToXml(): runtime error: file %s line %s element output in %s on line %d |
| 270 |
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+ |
| 271 |
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+Warning: XSLTProcessor::transformToXml(): File write for %s/bug54446test.txt refused in %s on line %s |
| 272 |
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+ |
| 273 |
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+Warning: XSLTProcessor::transformToXml(): runtime error: file %s line %d element output in %s on line %d |
| 274 |
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+ |
| 275 |
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+Warning: XSLTProcessor::transformToXml(): xsltDocumentElem: write rights for %s/bug54446test.txt denied in %s on line %d |
| 276 |
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+OK, no file created |
| 277 |
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+--CREDITS-- |
| 278 |
|
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+Christian Stocker, chregu@php.net |
| 279 |
|
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+ |
| 280 |
|
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--- php-5.3.3/ext/xsl/xsltprocessor.c.cve0057 |
| 281 |
|
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+++ php-5.3.3/ext/xsl/xsltprocessor.c |
| 282 |
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@@ -475,6 +475,9 @@ static xmlDocPtr php_xsl_apply_styleshee |
| 283 |
|
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zval *doXInclude, *member; |
| 284 |
|
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zend_object_handlers *std_hnd; |
| 285 |
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FILE *f; |
| 286 |
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+ int secPrefsError = 0; |
| 287 |
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+ int secPrefsValue; |
| 288 |
|
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+ xsltSecurityPrefsPtr secPrefs = NULL; |
| 289 |
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| 290 |
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node = php_libxml_import_node(docp TSRMLS_CC); |
| 291 |
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|
| 292 |
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@@ -531,11 +534,56 @@ static xmlDocPtr php_xsl_apply_styleshee |
| 293 |
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} |
| 294 |
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efree(member); |
| 295 |
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|
| 296 |
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- newdocp = xsltApplyStylesheetUser(style, doc, (const char**) params, NULL, f, ctxt); |
| 297 |
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+ |
| 298 |
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+ secPrefsValue = INI_INT("xsl.security_prefs"); |
| 299 |
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+ |
| 300 |
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+ /* if securityPrefs is set to NONE, we don't have to do any checks, but otherwise... */ |
| 301 |
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+ if (secPrefsValue != XSL_SECPREF_NONE) { |
| 302 |
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+ secPrefs = xsltNewSecurityPrefs(); |
| 303 |
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+ if (secPrefsValue & XSL_SECPREF_READ_FILE ) { |
| 304 |
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+ if (0 != xsltSetSecurityPrefs(secPrefs, XSLT_SECPREF_READ_FILE, xsltSecurityForbid)) { |
| 305 |
|
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+ secPrefsError = 1; |
| 306 |
|
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+ } |
| 307 |
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+ } |
| 308 |
|
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+ if (secPrefsValue & XSL_SECPREF_WRITE_FILE ) { |
| 309 |
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+ if (0 != xsltSetSecurityPrefs(secPrefs, XSLT_SECPREF_WRITE_FILE, xsltSecurityForbid)) { |
| 310 |
|
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+ secPrefsError = 1; |
| 311 |
|
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+ } |
| 312 |
|
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+ } |
| 313 |
|
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+ if (secPrefsValue & XSL_SECPREF_CREATE_DIRECTORY ) { |
| 314 |
|
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+ if (0 != xsltSetSecurityPrefs(secPrefs, XSLT_SECPREF_CREATE_DIRECTORY, xsltSecurityForbid)) { |
| 315 |
|
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+ secPrefsError = 1; |
| 316 |
|
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+ } |
| 317 |
|
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+ } |
| 318 |
|
|
+ if (secPrefsValue & XSL_SECPREF_READ_NETWORK) { |
| 319 |
|
|
+ if (0 != xsltSetSecurityPrefs(secPrefs, XSLT_SECPREF_READ_NETWORK, xsltSecurityForbid)) { |
| 320 |
|
|
+ secPrefsError = 1; |
| 321 |
|
|
+ } |
| 322 |
|
|
+ } |
| 323 |
|
|
+ if (secPrefsValue & XSL_SECPREF_WRITE_NETWORK) { |
| 324 |
|
|
+ if (0 != xsltSetSecurityPrefs(secPrefs, XSLT_SECPREF_WRITE_NETWORK, xsltSecurityForbid)) { |
| 325 |
|
|
+ secPrefsError = 1; |
| 326 |
|
|
+ } |
| 327 |
|
|
+ } |
| 328 |
|
|
+ |
| 329 |
|
|
+ if (0 != xsltSetCtxtSecurityPrefs(secPrefs, ctxt)) { |
| 330 |
|
|
+ secPrefsError = 1; |
| 331 |
|
|
+ } |
| 332 |
|
|
+ } |
| 333 |
|
|
+ |
| 334 |
|
|
+ if (secPrefsError == 1) { |
| 335 |
|
|
+ php_error_docref(NULL TSRMLS_CC, E_WARNING, "Can't set libxslt security properties, not doing transformation for security reasons"); |
| 336 |
|
|
+ } else { |
| 337 |
|
|
+ newdocp = xsltApplyStylesheetUser(style, doc, (const char**) params, NULL, f, ctxt); |
| 338 |
|
|
+ } |
| 339 |
|
|
if (f) { |
| 340 |
|
|
fclose(f); |
| 341 |
|
|
} |
| 342 |
|
|
+ |
| 343 |
|
|
xsltFreeTransformContext(ctxt); |
| 344 |
|
|
+ if (secPrefs) { |
| 345 |
|
|
+ xsltFreeSecurityPrefs(secPrefs); |
| 346 |
|
|
+ } |
| 347 |
|
|
|
| 348 |
|
|
if (intern->node_list != NULL) { |
| 349 |
|
|
zend_hash_destroy(intern->node_list); |
| 350 |
|
|
--- php-5.3.3/php.ini-development.cve0057 |
| 351 |
|
|
+++ php-5.3.3/php.ini-development |
| 352 |
|
|
@@ -1890,6 +1890,12 @@ ldap.max_links = -1 |
| 353 |
|
|
[dba] |
| 354 |
|
|
;dba.default_handler= |
| 355 |
|
|
|
| 356 |
|
|
+[xsl] |
| 357 |
|
|
+; Write operations from within XSLT are disabled by default. |
| 358 |
|
|
+; XSL_SECPREF_CREATE_DIRECTORY | XSL_SECPREF_WRITE_NETWORK | XSL_SECPREF_WRITE_FILE = 44 |
| 359 |
|
|
+; Set it to 0 to allow all operations |
| 360 |
|
|
+;xsl.security_prefs = 44 |
| 361 |
|
|
+ |
| 362 |
|
|
; Local Variables: |
| 363 |
|
|
; tab-width: 4 |
| 364 |
|
|
; End: |
| 365 |
|
|
--- php-5.3.3/php.ini-production.cve0057 |
| 366 |
|
|
+++ php-5.3.3/php.ini-production |
| 367 |
|
|
@@ -1897,6 +1897,12 @@ ldap.max_links = -1 |
| 368 |
|
|
[dba] |
| 369 |
|
|
;dba.default_handler= |
| 370 |
|
|
|
| 371 |
|
|
+[xsl] |
| 372 |
|
|
+; Write operations from within XSLT are disabled by default. |
| 373 |
|
|
+; XSL_SECPREF_CREATE_DIRECTORY | XSL_SECPREF_WRITE_NETWORK | XSL_SECPREF_WRITE_FILE = 44 |
| 374 |
|
|
+; Set it to 0 to allow all operations |
| 375 |
|
|
+;xsl.security_prefs = 44 |
| 376 |
|
|
+ |
| 377 |
|
|
; Local Variables: |
| 378 |
|
|
; tab-width: 4 |
| 379 |
|
|
; End: |
| 380 |
|
|
--- php-5.3.3/UPGRADING.cve0057 |
| 381 |
|
|
+++ php-5.3.3/UPGRADING |
| 382 |
|
|
@@ -150,6 +150,15 @@ UPGRADE NOTES - PHP 5.3 |
| 383 |
|
|
|
| 384 |
|
|
- SplObjectStorage now has ArrayAccess support. It is also now possible to |
| 385 |
|
|
store associative information with objects in SplObjectStorage. |
| 386 |
|
|
+ |
| 387 |
|
|
+===================== |
| 388 |
|
|
+4.1 New in PHP 5.3.9 |
| 389 |
|
|
+===================== |
| 390 |
|
|
+ |
| 391 |
|
|
+- Write operations within XSLT (for example with the extension sax:output) are |
| 392 |
|
|
+ disabled by default. You can define what is forbidden with the INI option |
| 393 |
|
|
+ xsl.security_prefs. This option will be marked as deprecated in 5.4 again. |
| 394 |
|
|
+ Use the method XsltProcess::setSecurityPrefs($options) there. |
| 395 |
|
|
|
| 396 |
|
|
============= |
| 397 |
|
|
5. Deprecated |
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| 
Revision Log
| 
Revision Graph
