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Moodle KSES HTML Filter Bypass Vulnerability
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Secunia Advisory:
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SA30986
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Release Date:
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2008-07-09
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Last Update:
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2008-09-10
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Popularity:
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1,504 views
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Critical:
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Highly critical
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Impact:
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System access
Security Bypass
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Where:
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From remote
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Solution Status:
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Vendor Patch
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| Software: | Moodle 1.8.x
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| CVE reference: | CVE-2008-1502
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Description:
Some vulnerabilities have been reported in Moodle, which can be exploited by malicious people to bypass certain security restrictions.
1) Vulnerabilities are caused due to insufficient filtering functions within /lib/kses.php and lib/weblib.php and can be exploited to bypass HTML filtering policies.
2) Input passed to a call to "preg_replace()" with the "e" modifier in kses.php is not properly sanitised before being used. This can be exploited to inject and execute arbitrary PHP code.
The vulnerabilities are reported in versions prior to 1.8.5.
Solution:
Update to version 1.8.5 or upgrade to version 1.9.
The vendor recommends to use the option "Use HTML Purifier" in version 1.9.
Provided and/or discovered by:
Lukasz Pilorz, Allegro.pl, additional information from zurlich.lpt
Changelog:
2008-09-10: Added vulnerability #2. Raised criticality. Added link to "Original Advisory" section.
Original Advisory:
Moodle:
http://moodle.org/mod/forum/discuss.php?d=95031
http://milw0rm.com/exploits/6356
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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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