Lucene search

K
gentooGentoo FoundationGLSA-200609-17
HistorySep 27, 2006 - 12:00 a.m.

OpenSSH: Denial of service

2006-09-2700:00:00
Gentoo Foundation
security.gentoo.org
16

7.8 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:L/Au:N/C:N/I:N/A:C

0.912 High

EPSS

Percentile

98.8%

Background

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

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:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=net-misc/openssh-4.3_p2-r5"
OSVersionArchitecturePackageVersionFilename
Gentooanyallnet-misc/openssh< 4.3_p2-r5UNKNOWN

7.8 High

CVSS2

Access Vector

NETWORK

Access Complexity

LOW

Authentication

NONE

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

COMPLETE

AV:N/AC:L/Au:N/C:N/I:N/A:C

0.912 High

EPSS

Percentile

98.8%

Related for GLSA-200609-17