Debian DSA-1189-1 : openssh-krb5 - several vulnerabilities
High Nessus Plugin ID 22731
SynopsisThe remote Debian host is missing a security-related update.
DescriptionSeveral 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 :
- CVE-2006-4924 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.
- CVE-2006-5051 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.
SolutionUpgrade the openssh-krb5 packages.
For the stable distribution (sarge) these problems have been fixed in version 3.8.1p1-7sarge1.