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
Paul Starzetz and Wojciech Purczynski of isec.pl
discovered a critical
security vulnerability in the memory management code of Linux inside
the mremap(2) system call. Due to flushing the TLB (Translation
Lookaside Buffer, an address cache) too early it is possible for an
attacker to trigger a local root exploit.
The attack vectors for 2.4.x and 2.2.x kernels are exclusive for the
respective kernel series, though. We formerly believed that the
exploitable vulnerability in 2.4.x does not exist in 2.2.x which is
still true. However, it turned out that a second (sort of)
vulnerability is indeed exploitable in 2.2.x, but not in 2.4.x, with a
different exploit, of course.
For the stable distribution (woody) this problem has been fixed in
version 2.2.10-13woody1 of 2.2 kernel images for the powerpc/apus
architecture and in version 2.2.10-2 of Linux 2.2.10 source.
For the unstable distribution (sid) this problem will be fixed soon
with the 2.4.20 kernel-image package for powerpc/apus. The old 2.2.10
kernel image will be removed from Debian unstable.
You are strongly advised to switch to the fixed 2.4.17 kernel-image
package for powerpc/apus from woody until the 2.4.20 kernel-image
package is fixed in the unstable distribution.
We recommend that you upgrade your Linux kernel package.
Vulnerability matrix for CVE-2004-0077
Solution : http://www.debian.org/security/2004/dsa-466
Network Security Threat Level: High
Networks Security ID: 9686
Vulnerability Assessment Copyright: This script is (C) 2005 Michel Arboi
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