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[ GLSA 200609-17 ] OpenSSH: Denial of Service
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GLSA
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Joined: 12 May 2004
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PostPosted: Wed Sep 27, 2006 6:26 pm    Post subject: [ GLSA 200609-17 ] OpenSSH: Denial of Service Reply with quote

Gentoo Linux Security Advisory

Title: OpenSSH: Denial of Service (GLSA 200609-17)
Severity: normal
Exploitable: remote
Date: September 27, 2006
Bug(s): #148228
ID: 200609-17

Synopsis

A flaw in the OpenSSH daemon allows remote unauthenticated attackers to cause a Denial of Service.

Background

OpenSSH is a free suite of applications for the SSH protocol, developed and maintained by the OpenBSD project.

Affected Packages

Package: net-misc/openssh
Vulnerable: < 4.3_p2-r5
Unaffected: >= 4.3_p2-r5
Architectures: All supported architectures


Description

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.

Resolution

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


References

CVE-2006-4924


Last edited by GLSA on Thu Sep 28, 2006 4:17 am; edited 1 time in total
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