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Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200609-17] OpenSSH: Denial of Service

Vulnerability Assessment Details

[GLSA-200609-17] OpenSSH: Denial of Service

Vulnerability Assessment Summary
OpenSSH: Denial of Service

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200609-17
(OpenSSH: Denial of Service)

Tavis Ormandy of the Google Security Team discovered a Denial of
Service vulnerability in the SSH protocol version 1 CRC compensation
attack detector.

Impact

A remote unauthenticated attacker may be able to trigger excessive CPU
usage by sending a pathological SSH message, denying service to other
legitimate users or processes.

Workaround

The system administrator may disable SSH protocol version 1 in
/etc/ssh/sshd_config.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4924

Solution:
All OpenSSH users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/openssh-4.3_p2-r5"

Network Security Threat Level: Medium

Networks Security ID:

Vulnerability Assessment Copyright: (C) 2006 Michel Arboi

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