Vulnerability Assessment & Network Security Forums



If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.


Home >> Browse Vulnerability Assessment Database >> Gentoo Local Security Checks >> [GLSA-200611-06] OpenSSH: Multiple Denial of Service vulnerabilities


Vulnerability Assessment Details

[GLSA-200611-06] OpenSSH: Multiple Denial of Service vulnerabilities

Vulnerability Assessment Summary
OpenSSH: Multiple Denial of Service vulnerabilities

Detailed Explanation for this Vulnerability Assessment
The remote host is affected by the vulnerability described in GLSA-200611-06
(OpenSSH: Multiple Denial of Service vulnerabilities)


Tavis Ormandy of the Google Security Team has discovered a
pre-authentication vulnerability, causing sshd to spin until the login
grace time has been expired. Mark Dowd found an unsafe signal handler
that was vulnerable to a race condition. It has also been discovered
that when GSSAPI authentication is enabled, GSSAPI will in certain
cases incorrectly abort.

Impact

The pre-authentication and signal handler vulnerabilities can cause a
Denial of Service in OpenSSH. The vulnerability in the GSSAPI
authentication abort could be used to acertain the validity of
usernames on some platforms.

Workaround

There is no known workaround at this time.

References:
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5051
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-5052
http://www.openssh.com/txt/release-4.4


Solution:
All OpenSSH users should upgrade to the latest version:
# emerge --sync
# emerge --ask --oneshot --verbose ">=net-misc/openssh-4.4_p1-r5"


Network Security Threat Level: Medium


Networks Security ID:

Vulnerability Assessment Copyright: (C) 2006 Michel Arboi

Cables, Connectors

Dell PowerEdge R720 Server Dual E5-2690 v2 10C 3.0GHz 128GB 4x 1TB SAS 3.5in 8B
$6320.0
Dell PowerEdge R720 Server Dual E5-2690 v2 10C 3.0GHz 128GB 4x 1TB SAS 3.5in 8B pictureHP 251-a120 (1TB HDD, AMD A6-6310 APU, 1.80GHz, 4GB) Black Desktop Computer
$125.0
HP 251-a120 (1TB HDD, AMD A6-6310 APU, 1.80GHz, 4GB) Black Desktop Computer  pictureDell Precision T1650 Intel Core i7-3770 3.4GHz 16GB DDR3 256GB 1TB Window 7 Pro
$419.99
Dell Precision T1650 Intel Core i7-3770 3.4GHz 16GB DDR3 256GB 1TB Window 7 Pro pictureSeagate Laptop SSHD 1TB,Internal,5400RPM,2.5" (ST1000LM014) SSHD
$75.0
Seagate Laptop SSHD 1TB,Internal,5400RPM,2.5


Discussions

No Discussions have been posted on this vulnerability.