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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
Olof Johansson reported a local DoS (Denial of Service) vulnerability
on the PPC970 platform. Unpriveleged users can hang the system by
executing the "attn" instruction, which was not being disabled at boot.
Kirill Korotaev reported a local DoS (Denial of Service) vulnerability
on the ia64 and sparc architectures. A user could cause the system to
crash by executing a malformed ELF binary due to insufficient verification
of the memory layout.
ADLab Venustech Info Ltd reported a potential remote DoS (Denial of
Service) vulnerability in the IP over ATM subsystem. A remote system
could cause the system to crash by sending specially crafted packets
that would trigger an attempt to free an already-freed pointer
resulting in a system crash.
Martin Schwidefsky reported a potential leak of sensitive information
on s390 systems. The copy_from_user function did not clear the remaining
bytes of the kernel buffer after receiving a fault on the userspace
address, resulting in a leak of uninitialized kernel memory. A local user
could exploit this by appending to a file from a bad address.
Fabio Massimo Di Nitto reported a potential remote DoS (Denial of Service)
vulnerability on powerpc systems. The alignment exception only
checked the exception table for -EFAULT, not for other errors. This can
be exploited by a local user to cause a system crash (panic).
Bill Allombert reported that various mount options are ignored by smbfs
when UNIX extensions are enabled. This includes the uid, gid and mode
options. Client systems would silently use the server-provided settings
instead of honoring these options, changing the security model. This
update includes a fix from Haroldo Gamal that forces the kernel to honor
these mount options. Note that, since the current versions of smbmount
always pass values for these options to the kernel, it is not currently
possible to activate unix extensions by omitting mount options. However,
this behavior is currently consistent with the current behavior of the
next Debian release, 'etch'.
The following matrix explains which kernel version for which architecture
fix the problems mentioned above:
The following matrix lists additional packages that were rebuilt for
compatibility with or to take advantage of this update:
We recommend that you upgrade your kernel package immediately and reboot
the machine. If you have built a custom kernel from the kernel source
package, you will need to rebuild to take advantage of these fixes.
Solution : http://www.debian.org/security/2006/dsa-1237
Network Security Threat Level: High
Networks Security ID:
Vulnerability Assessment Copyright: This script is (C) 2006 Michel Arboi
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