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Insecure Library Loading
Moderately critical

TWiki Restricted Content Access and Denial of Service

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Release Date:  2006-03-27    Views:  11,679

Secunia Advisory SA19410

Where:

From remote

Impact:

Security Bypass, DoS

Solution Status:

Vendor Patch

Software:

CVE Reference(s):

Description


A vulnerability and a security issue have been reported in TWiki, which can be exploited by malicious people to cause a DoS (Denial of Service) and bypass certain security restrictions.

1) The problem is that it is possible to view restricted content via the rdiff and preview scripts.

Example:
http://[host]/bin/preview/[restricted content]/WebHome?action=foo

The security issue has been reported in releases TWikiRelease04x00x01 and TWikiRelease04x00x00.

2) An error in the handling of circular references for the "%INCLUDE" statement can be exploited to cause an infinite recursion and consume a large amount of memory resources on a vulnerable system by supplying a URL which references itself.

The vulnerability has been reported in the following releases:
* TWikiRelease04x00x01
* TWikiRelease04x00x00
* TWikiRelease04Sep2004
* TWikiRelease03Sep2004
* TWikiRelease02Sep2004
* TWikiRelease01Sep2004
* TWikiRelease01Feb2003
* TWikiRelease01Dec2001
* TWikiRelease01Sep2001


Solution:
Apply patches (see vendor advisories).

Further details available to Secunia VIM customers

Provided and/or discovered by:
The vendor credits:
1) Sergej Zagursky and Steffen Poulsen
2) Kenneth Lavrsen

Original Advisory:
1) http://twiki.org/cgi-bin/view/Codev/SecurityAlertTWiki4RdiffPreviewAccess
2) http://twiki.org/cgi-bin/view/Codev/SecurityAdvisoryDosAttackWithInclude

Deep Links:
Links available to Secunia VIM customers

Do you have additional information related to this advisory?

Please provide information about patches, mitigating factors, new versions, exploits, faulty patches, links, and other relevant data by posting comments to this Advisory. You can also send this information to vuln@secunia.com

Subject: TWiki Restricted Content Access and Denial of Service

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