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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 and remote vulnerabilities have been discovered in the
Linux kernel that may lead to a denial of service or the execution of
arbitrary code. The Common Vulnerabilities and Exposures project
identifies the following problems:
Alexander Nyberg discovered that the ptrace() system call does not
properly verify addresses on the amd64 architecture which can be
exploited by a local attacker to crash the kernel.
A problem in the offset handling in the xattr file system code for
ext3 has been discovered that may permit users on 64-bit systems
that have access to an ext3 filesystem with extended attributes to
cause the kernel to crash.
A vulnerability has been discovered in the ptrace() system call on
the amd64 architecture that permits a local attacker to cause the
kernel to crash.
A vulnerability has been discovered in the stack segment fault
handler that could permit a local attacker to cause a stack exception
that will lead the kernel to crash under certain circumstances.
Ilja van Sprundel discovered a race condition in the IA32 (x86)
compatibility execve() systemcall for amd64 and IA64 that permits
local attackers to cause the kernel to panic and possibly execute
Balazs Scheidler discovered that a local attacker could call
setsockopt() with an invalid xfrm_user policy message which would
cause the kernel to write beyond the boundaries of an array and
Vladimir Volovich discovered a bug in the zlib routines which are
also present in the Linux kernel and permits remote attackers to
crash the kernel.
Another vulnerability has been discovered in the zlib routines
which are also present in the Linux kernel and permits remote
attackers to crash the kernel.
A null pointer dereference in ptrace when tracing a 64-bit
executable can cause the kernel to crash.
Andreas Gruenbacher discovered a bug in the ext2 and ext3 file
systems. When data areas are to be shared among two inodes not
all information were compared for equality, which could expose
wrong ACLs for files.
Chad Walstrom discovered that the ipt_recent kernel module to stop
SSH bruteforce attacks could cause the kernel to crash on 64-bit
An error in the NAT code permits remote attackers to cause a denial
of service (memory corruption) by causing two packets for the same
protocol to be NATed at the same time, which leads to memory
The following matrix explains which kernel version for which architecture
fix the problems mentioned above:
We recommend that you upgrade your kernel package immediately and
reboot the machine.
Solution : http://www.debian.org/security/2005/dsa-921
Network Security Threat Level: High
Networks Security ID: 14477
Vulnerability Assessment Copyright: This script is (C) 2006 Michel Arboi
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