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Family: Debian Local Security Checks --> Category: infos
[DSA1103] DSA-1103-1 kernel-source-2.6.8 Vulnerability Scan
Vulnerability Scan Summary
DSA-1103-1 kernel-source-2.6.8
Detailed Explanation for this Vulnerability Test
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:
Franz Filz discovered that some socket calls permit causing inconsistent
reference counts on loadable modules, which allows 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
control systems.
"Solar Designer" discovered a race condition in netfilter's
do_add_counters() function, which allows information disclosure of kernel
memory by exploiting a race condition. Likewise, it requires CAP_NET_ADMIN
rights.
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 allows information disclosure of previously deleted
files.
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 allows
tricking the kernel into a crash, thus allowing denial of service.
It was discovered by Cliff Wickman that perfmon for the IA64
architecture allows users to trigger a BUG() assert, which allows
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
address.
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 allows 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 allowing 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
Threat Level: High
Click HERE for more information and discussions on this network vulnerability scan.
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