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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
Franz Filz discovered that some socket calls permit causing inconsistent
reference counts on loadable modules, which permits local users to cause
a denial of service.
"Solar Designer" discovered that arithmetic computations in netfilter's
do_replace() function can lead to a buffer overflow and the execution of
arbitrary code. However, the operation requires CAP_NET_ADMIN rights,
which is only an issue in virtualization systems or fine grained access
"Solar Designer" discovered a race condition in netfilter's
do_add_counters() function, which permits information disclosure of kernel
memory by exploiting a race condition. Likewise, it requires CAP_NET_ADMIN
David Howells discovered that the s390 assembly version of the
strnlen_user() function incorrectly returns some string size values.
It was discovered that the ftruncate() function of XFS can expose
unallocated blocks, which permits information disclosure of previously deleted
It was discovered that some NFS file operations on handles mounted with
O_DIRECT can force the kernel into a crash.
It was discovered that the code to configure memory policies permits
tricking the kernel into a crash, thus permiting denial of service.
It was discovered by Cliff Wickman that perfmon for the IA64
architecture permits users to trigger a BUG() assert, which permits
denial of service.
Intel EM64T systems were discovered to be susceptible to a local
DoS due to an endless recursive fault related to a bad ELF entry
Alan and Gareth discovered that the ia64 platform had an
incorrectly declared die_if_kernel() function as "does never
return" which could be exploited by a local attacker resulting in
a kernel crash.
The Linux kernel did not properly handle uncanonical return
addresses on Intel EM64T CPUs, reporting exceptions in the SYSRET
instead of the next instruction, causing the kernel exception
handler to run on the user stack with the wrong GS. This may result
in a DoS due to a local user changing the frames.
AMD64 machines (and other 7th and 8th generation AuthenticAMD
processors) were found to be vulnerable to sensitive information
leakage, due to how they handle saving and restoring the FOP, FIP,
and FDP x87 registers in FXSAVE/FXRSTOR when an exception is
pending. This permits a process to acertain portions of the state
of floating point instructions of other processes.
Marco Ivaldi discovered that there was an unintended information
disclosure permiting remote attackers to bypass protections against
Idle Scans (nmap -sI) by abusing the ID field of IP packets and
bypassing the zero IP ID in DF packet countermeasure. This was a
result of the ip
Solution : http://www.debian.org/security/2006/dsa-1103
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is (C) 2006 Michel Arboi
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