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Secunia Security Advisory 17749

Secunia Security Advisory 17749
Posted Nov 30, 2005
Authored by Secunia | Site secunia.com

Secunia Security Advisory - Jack Louis has discovered a vulnerability in Webmin, which can be exploited by malicious people to cause a DoS (Denial of Service).

tags | advisory, denial of service
SHA-256 | ca6b7947ce29da38dd256fa5d64059a6f9636922e5e0de30e8ba9a8c394eff17

Secunia Security Advisory 17749

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TITLE:
Webmin "miniserv.pl" Format String Denial of Service Vulnerability

SECUNIA ADVISORY ID:
SA17749

VERIFY ADVISORY:
http://secunia.com/advisories/17749/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From remote

SOFTWARE:
Webmin 1.x
http://secunia.com/product/1115/

DESCRIPTION:
Jack Louis has discovered a vulnerability in Webmin, which can be
exploited by malicious people to cause a DoS (Denial of Service).

The vulnerability is caused due to a format string error in the
"miniserv.pl" script when logging failed authentication attempts.
This can be exploited to consume a large amount of CPU and memory
resources on a vulnerable system by attempting to login with a
specially crafted username.

It has also been reported that the format string error in the Perl
script can be exploited for code execution purposes. However, this
has not been shown.

The vulnerability has been confirmed in version 1.240. Other versions
may also be affected.

SOLUTION:
Filter traffic to the Webmin web interface (by default port 10000) or
edit the source code to ensure that input is not logged insecurely to
the syslog.

PROVIDED AND/OR DISCOVERED BY:
Jack Louis, Dyad Security

ORIGINAL ADVISORY:
http://www.dyadsecurity.com/webmin-0001.html

----------------------------------------------------------------------

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
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

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