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TWiki Restricted Content Access and Denial of Service Advisory Available in Danish 

Secunia Advisory: SA19410  
Release Date: 2006-03-27

Critical:
Moderately critical
Impact: Security Bypass
DoS
Where: From remote
Solution Status: Vendor Patch

Software:TWiki

CVE reference:CVE-2006-1386 (Secunia mirror)
CVE-2006-1387 (Secunia mirror)

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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).

The vulnerability and the security issue will also be fixed in the upcoming 4.0.2 version.

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



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.

9 Related Secunia Security Advisories

1. TWiki CGI Session File Unspecified Perl Code Execution
2. TWiki Authentication Bypass Vulnerability
3. TWiki "filename" Parameter Disclosure of Sensitive Information
4. TWiki "TYPEOF" Arbitrary Command Execution Vulnerability
5. TWiki Multiple File Extensions File Upload Vulnerability
6. TWiki Registration Account Override Vulnerability
7. TWiki "%INCLUDE" Shell Command Injection Vulnerability
8. TWiki "rev" Shell Command Injection Vulnerability
9. TWiki "Search.pm" Shell Command Injection Vulnerability


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If you have new information regarding this Secunia advisory or a product in our database, please send it to us using either our web form or email us at vuln@secunia.com.

Ideas, suggestions, and other feedback are most welcome.








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