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PHP4 ZVAL Reference Counter Overflow and Cross-Site Scripting
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Secunia Advisory:
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SA24356
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Release Date:
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2007-03-05
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Last Update:
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2007-05-04
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Popularity:
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8,282 views
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Critical:
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Less critical
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Impact:
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Security Bypass
Cross Site Scripting
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Where:
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Local system
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Solution Status:
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Partial Fix
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| Software: | PHP 4.4.x
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| CVE reference: | CVE-2007-1287
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Description:
Stefan Esser has discovered some vulnerabilities in PHP4, which can be exploited by malicious, local users to bypass certain security restrictions, and by malicious people to conduct cross-site scripting attacks.
1) The vulnerability is caused due to an integer overflow in the handling of ZVAL structures. This can be exploited to corrupt memory and execute arbitrary code therefore bypassing security restrictions like the "disable_functions" directive.
The vulnerability is confirmed in version 4.4.6. Other versions may also be affected.
2) Input passed via array parameters is not properly sanitised before being returned to the user within a "phpinfo()" call. This can be exploited to execute arbitrary HTML and script code in a user's browser session in context of an affected site via a script calling "phpinfo()".
This is related to:
SA17371 (vulnerability #3)
SA19599 (vulnerability #1)
The vulnerability is confirmed in version 4.4.6 and also reported in versions 4.4.3 through 4.4.6. Other versions may also be affected.
Solution:
Update to version 4.4.7 to fix vulnerability #2. Grant only trusted users access to affected systems. PHP scripts calling "phpinfo()" should not be publicly accessible on production systems.
Provided and/or discovered by:
Stefan Esser
Changelog:
2007-03-05: Updated "Description" section. Added information about phpinfo() vulnerability.
2007-03-09: Added CVE reference.
2007-05-04: Updated "Solution" section.
Original Advisory:
PHP:
http://www.php.net/releases/4_4_7.php
MOPB:
1) http://www.php-security.org/MOPB/MOPB-01-2007.html
2) http://www.php-security.org/MOPB/MOPB-08-2007.html
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
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