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.
Vulnerability Assessment Details
Detailed Explanation for this Vulnerability Assessment
Several remote vulnerabilities have been discovered in OpenSSH, a free
implementation of the Secure Shell protocol, which may lead to denial of
service and potentially the execution of arbitrary code. The Common
Vulnerabilities and Exposures project identifies the following problems:
Tavis Ormandy of the Google Security Team discovered a denial of
service vulnerability in the mitigation code against complexity
attacks, which might lead to increased CPU consumption until a
timeout is triggered. This is only exploitable if support for
SSH protocol version 1 is enabled.
Mark Dowd discovered that insecure signal handler usage could
potentially lead to execution of arbitrary code through a double
free. The Debian Security Team doesn't believe the general openssh
package without Kerberos support to be exploitable by this issue.
However, due to the complexity of the underlying code we will
issue an update to rule out all eventualities.
For the stable distribution (sarge) these problems have been fixed in
For the unstable distribution (sid) these problems have been fixed in
version 4.3p2-4 of openssh. openssh-krb5 will soon be converted towards
a transitional package against openssh.
We recommend that you upgrade your openssh-krb5 packages.
Solution : http://www.debian.org/security/2006/dsa-1189
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is (C) 2007 Michel Arboi
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