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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 local root exploits have been discovered recently in the Linux
kernel. This security advisory updates the PA-RISC kernel 2.4.18 for
Debian GNU/Linux. The Common Vulnerabilities and Exposures project
identifies the following problems that are fixed with this update:
An integer overflow in brk() system call (do_brk() function) for
Linux permits a local attacker to gain root rights. Fixed
upstream in Linux 2.4.23.
Paul Starzetz discovered a flaw in bounds checking in mremap() in
the Linux kernel (present in version 2.4.x and 2.6.x) which may
permit a local attacker to gain root rights. Version 2.2 is not
affected by this bug. Fixed upstream in Linux 2.4.24.
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 missing function
return value check of internal functions a local attacker can gain
root rights. Fixed upstream in Linux 2.4.25 and 2.6.3.
Please note that the source package has to include a lot of updates in
order to compile the package, which wasn't possible with the old
For the stable distribution (woody) these problems have been fixed in
version 62.1 of kernel-image-2.4.18-hppa.
For the unstable distribution (sid) these problems have been fixed in
version 2.4.25-1 of kernel-image-2.4.25-hppa.
We recommend that you upgrade your Linux kernel packages immediately.
Solution : http://www.debian.org/security/2004/dsa-475
Network Security Threat Level: High
Networks Security ID: 9138, 9356, 9686
Vulnerability Assessment Copyright: This script is (C) 2005 Michel Arboi
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