----------------------------------------------------------------------

Secunia is proud to announce the availability of the Secunia Software
Inspector.

The Secunia Software Inspector is a free service that detects insecure
versions of software that you may have installed in your system. When
insecure versions are detected, the Secunia Software Inspector also
provides thorough guidelines for updating the software to the latest
secure version from the vendor.

Try it out online:
http://secunia.com/software_inspector/

----------------------------------------------------------------------

TITLE:
Linux Kernel Various Vulnerabilities

SECUNIA ADVISORY ID:
SA23361

VERIFY ADVISORY:
http://secunia.com/advisories/23361/

CRITICAL:
Less critical

IMPACT:
DoS

WHERE:
>From local network

OPERATING SYSTEM:
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
Some vulnerabilities have been reported within the Linux kernel,
which can be exploited by malicious, local users and malicious people
to cause a DoS (Denial of Service).

1) An error within the "nlmclnt_mark_reclaim()" function in
clntlock.c of the NFS lockd can be exploited by malicious people to
cause a DoS by crashing the service.

2) The task switching implementation fails to save and restore EFLAGS
of process correctly. This can be exploited by malicious, local users
to crash applications and services by invoking a specially crafted
executable.

3) An error within the lock handling of the "sys_get_robust_list()"
and "sys_set_robust_list()" system calls for the SPARC and PowerPC
platforms can be exploited by malicious, local users to e.g. consume
all system resources, create unkillable processes, and render a
system unrebootable.

4) Problems within the alignment exception handling on SPARC and
PowerPC platforms can be exploited by malicious, local users to cause
a kernel crash.

5) An error within the implementation of the squashfs file system can
be exploited to cause a DoS by mounting a specially crafted squashfs
image and performing a read operation on the mounted file system.

6) If UNIX extensions are enabled, certain smbfs mount options are
ignored and a client silently mounts shares using the uid, gid and
mode options from the server.

SOLUTION:
Restrict access to trusted users only.

PROVIDED AND/OR DISCOVERED BY:
1) Matthias Andree
3, 4) Fabio Massimo Di Nitto
5) LMH
6) Bill Allombert

ORIGINAL ADVISORY:
http://www.ubuntu.com/usn/usn-395-1
http://www.us.debian.org/security/2006/dsa-1233

OTHER REFERENCES:
http://kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=47a5c6fa0e204a2b63309c648bb2fde36836c826
http://www.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=9b5b1f5bf9dcdb6f23abf65977a675eb4deba3c0

----------------------------------------------------------------------

About:
This Advisory was delivered by Secunia as a free service to help
everybody keeping their systems up to date against the latest
vulnerabilities.

Subscribe:
http://secunia.com/secunia_security_advisories/

Definitions: (Criticality, Where etc.)
http://secunia.com/about_secunia_advisories/


Please Note:
Secunia recommends that you verify all advisories you receive by
clicking the link.
Secunia NEVER sends attached files with advisories.
Secunia does not advise people to install third party patches, only
use those supplied by the vendor.

----------------------------------------------------------------------

Unsubscribe: Secunia Security Advisories
http://secunia.com/sec_adv_unsubscribe/?email=packet%40packetstormsecurity.org

----------------------------------------------------------------------