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phpBB "Referer" Header Session ID Disclosure
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Secunia Advisory:
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SA18693
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Release Date:
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2006-02-06
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Last Update:
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2008-04-15
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Popularity:
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11,930 views
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Critical:
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Less critical
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Impact:
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Hijacking
Cross Site Scripting
Exposure of sensitive information
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Where:
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From remote
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Solution Status:
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Vendor Workaround
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| Software: | phpBB 2.x
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| CVE reference: | CVE-2006-0437
CVE-2006-0438
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Description:
Maksymilian Arciemowicz has discovered a vulnerability in phpBB, which can be exploited by malicious people to disclose sensitive information.
The problem is that the session ID is included in the "Referer" HTTP header when sending certain requests for external avatar images and certain BBcode referencing external web sites (e.g. when performing various moderation actions, like splitting a thread). This can e.g. be exploited to disclose a user's session ID by tricking the user into performing an affected operation.
This is related to:
SA16868
Successful exploitation may open up for various cross-site request forgery and cross-site scripting attacks.
The vulnerability is confirmed in version 2.0.19 and 2.0.23. Other versions may also be affected.
Solution:
Disable support for external avatar images and BBcode IMG tags.
Reportedly fixed in the SVN repository.
Provided and/or discovered by:
Maksymilian Arciemowicz. Additional information provided by NBBN.
Changelog:
2006-04-14: Updated "Solution" section.
2008-03-20: Updated advisory with additional information provided by NBBN. Added version 2.0.23 and 3.0.0 as affected.
2008-04-15: Updated "Description" and "Solution" sections. According to the vendor, SIDs are not sensitive information in version 3.x. Leaked SIDs can therefore not be used to conduct further attacks.
Original Advisory:
http://securityreason.com/achievement_securityalert/31
Other References:
SA16868:
http://secunia.com/advisories/16868/
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About this Secunia Advisory
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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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