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TITLE:
Linux Kernel ASN.1 BER Decoding Vulnerability

SECUNIA ADVISORY ID:
SA30580

VERIFY ADVISORY:
http://secunia.com/advisories/30580/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

OPERATING SYSTEM:
Linux Kernel 2.4.x
http://secunia.com/product/763/
Linux Kernel 2.6.x
http://secunia.com/product/2719/

DESCRIPTION:
A vulnerability has been reported in the Linux Kernel, which can be
exploited by malicious people to cause a DoS (Denial of Service) and
potentially compromise a vulnerable system.

The vulnerability is caused due to an error within the ASN.1 BER
decoder of the cifs and ip_nat_snmp_basic modules when calculating
the buffer size. This can be exploited to cause a crash or
potentially execute arbitrary code by sending specially crafted BER
encoded data to a vulnerable system.

The vulnerability is reported in versions prior to 2.4.36.6 of the
2.4 branch and prior to version 2.6.25.5 of the 2.6 branch.

SOLUTION:
Update to a fixed version.

Linux Kernel 2.4 branch:
Update to version 2.4.36.6 or later.

Linux Kernel 2.6 branch:
Update to version 2.6.25.5 or later.

PROVIDED AND/OR DISCOVERED BY:
Wei Wang, McAfee

ORIGINAL ADVISORY:
http://kernel.org/pub/linux/kernel/v2.4/ChangeLog-2.4.36.6
http://kernel.org/pub/linux/kernel/v2.6/ChangeLog-2.6.25.5

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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.

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