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TITLE:
Cisco Intrusion Prevention System Jumbo Frames Denial of Service

SECUNIA ADVISORY ID:
SA30767

VERIFY ADVISORY:
http://secunia.com/advisories/30767/

CRITICAL:
Moderately critical

IMPACT:
Security Bypass, DoS

WHERE:
>From remote

OPERATING SYSTEM:
Cisco Intrusion Prevention System (IPS) 5.x
http://secunia.com/product/5600/

SOFTWARE:
Cisco Intrusion Prevention System (IPS) 6.x
http://secunia.com/product/18819/

DESCRIPTION:
A vulnerability has been reported in Cisco Intrusion Prevention
System, which can be exploited by malicious people to cause a DoS
(Denial of Service) or bypass certain security restrictions.

The vulnerability is caused due to an unspecified error in the
processing of Jumbo Ethernet frames received on a Gigabit network
interface and can be exploited to trigger a kernel panic.

Successful exploitation requires that the Gigabit network interface
is configured for inline mode. 

NOTE: On platforms that continue to forward network traffic after a
kernel panic takes place, the vulnerability will result in the
bypassing of configured access controls and detection rules. 

The vulnerability is reported in versions prior to 5.1(8)E2 and
6.0(5)E2.

SOLUTION:
Reportedly, fixed versions 5.1(8)E2 and 6.0(5)E2 will be available
soon.

The vendor recommends disabling Jumbo Ethernet support. Please see
vendor's advisory for more details.

PROVIDED AND/OR DISCOVERED BY:
The vendor credits HD Moore of BreakingPoint Systems.

ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20080618-ips.shtml

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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:
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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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