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phpBB "Allow HTML" Script Insertion Security Issue
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Secunia Advisory:
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SA18125
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Release Date:
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2005-12-19
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Last Update:
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2006-04-14
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Critical:
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Less critical
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Impact:
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Cross Site Scripting
Exposure of system information
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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: | phpBB 2.x
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| | CVE reference: | CVE-2006-0063 (Secunia mirror)
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Description:
Maksymilian Arciemowicz has discovered a security issue in phpBB, which can be exploited by malicious people to conduct script insertion attacks.
Input passed in the message body when posting isn't properly sanitised before being used. This can be exploited to inject arbitrary JavaScript code, which will be executed in a user's browser session in context of an affected site when the malicious post is viewed.
Example:
<B C=">" onmouseover="[code]" X="<B "> H E L O </B>
Successful exploitation requires that "Allow HTML" is enabled (not default setting).
It is also possible to disclose the full path to "admin/admin_disallow.php" by accessing it directly with the "setmodules" parameter set to "1" (requires that "register_globals" is enabled).
The security issue has been confirmed in version 2.0.18 and has been inadequately fixed in version 2.0.19 (it is possible to bypass the fix by using single-quote characters instead of double-quote characters). Prior versions may also be affected.
Solution:
Update to version 2.0.20.
Set "Allow HTML" to "No".
Provided and/or discovered by:
Maksymilian Arciemowicz
Changelog:
2006-01-02: Updated "Solution" section.
2006-01-06: The security issue was inadequate fixed. Updated "Solution" section.
2006-01-09: Added CVE reference.
2006-04-14: Updated "Description" and "Solution" sections.
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Please note: The information that this Secunia Advisory is based on comes from a third party unless stated otherwise.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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