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TITLE:
Usermin "shell" Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA21968

VERIFY ADVISORY:
http://secunia.com/advisories/21968/

CRITICAL:
Not critical

IMPACT:
DoS

WHERE:
Local system

SOFTWARE:
Usermin 1.x
http://secunia.com/product/3586/

DESCRIPTION:
Hendrik Weimer has discovered a vulnerability in Usermin, which can
be exploited by malicious users to cause a DoS (Denial of Service).

Input passed to the "shell" parameter in chfn/save.cgi is not
properly sanitised before being used as a parameter for the "chsh"
command. This can be exploited to change the login shell of the root
account to an invalid value by passing an empty "shell" parameter.

The vulnerability has been confirmed in version 1.180. Other versions
may also be affected.

SOLUTION:
Update to version 1.220 or later.

PROVIDED AND/OR DISCOVERED BY:
Hendrik Weimer

ORIGINAL ADVISORY:
http://www.osreviews.net/reviews/admin/usermin

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About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
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Secunia NEVER sends attached files with advisories.
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use those supplied by the vendor.

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