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TITLE:
OpenSSH Signal Handling Vulnerability

SECUNIA ADVISORY ID:
SA22173

VERIFY ADVISORY:
http://secunia.com/advisories/22173/

CRITICAL:
Highly critical

IMPACT:
DoS, System access

WHERE:
>From remote

SOFTWARE:
OpenSSH 3.x
http://secunia.com/product/101/
OpenSSH 4.x
http://secunia.com/product/5653/

DESCRIPTION:
Mark Dowd reported a vulnerability in OpenSSH, which can be exploited
by malicious people to cause a DoS (Denial of Service) and potentially
compromise of a vulnerable system.

The vulnerability is caused due to a race condition within the signal
handling. This can be exploited to crash the OpenSSH server and
potentially allows the execution of arbitrary code.

The vulnerability has been reported in version 4.3. Prior versions
may also be affected.

SOLUTION:
Update to OpenSSH 4.4.

PROVIDED AND/OR DISCOVERED BY:
Mark Dowd

ORIGINAL ADVISORY:
http://openssh.org/txt/release-4.4

OTHER REFERENCES:
http://rhn.redhat.com/errata/RHSA-2006-0697.html

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About:
This Advisory was delivered by Secunia as a free service to help
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vulnerabilities.

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