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TWiki Authentication Bypass Vulnerability
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Secunia Advisory:
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SA23189
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Release Date:
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2006-12-01
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Last Update:
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2006-12-04
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Popularity:
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6,975 views
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Critical:
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Moderately critical
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Impact:
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Security Bypass
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: | TWiki
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Subscribe:
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| CVE reference: | CVE-2006-6071
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Description:
A vulnerability has been reported in TWiki, which can be exploited by malicious people to disclose certain sensitive information.
The vulnerability exists due to an error when handling failed login attempts. This can be exploited to bypass authentication and view content in access restricted topics by canceling a login attempt with a valid user name.
Successful exploitation requires that "ErrorDocument 401" is set to a TWiki topic, that ApacheLogin with TWiki-4.0 is used with sessions enabled or SessionPlugin is used for older versions, and TWiki is running on Apache 1.3.
The vulnerability is reported in versions TWikiRelease01Sep2004 through TWikiRelease04Sep2004 with SessionPlugin, and 4.0.0 through 4.0.5.
Solution:
Restrict access to the TWiki installation.
As a hotfix the vendor recommends to change the "ErrorDocument" line in httpd.conf or .htaccess, which prevents current attacks, but might not be a complete fix (see vendor advisory for details).
Provided and/or discovered by:
The vendor credits George Clark.
Changelog:
2006-12-04: Added CVE reference.
Original Advisory:
http://twiki.org/cgi-bin/view/Codev/SecurityAlert-CVE-2006-6071
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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.
Secunia collects, validates, and verifies all vulnerability reports issued by security research groups, vendors, and others.
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