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TITLE:
Cisco IOS Next Hop Resolution Protocol Buffer Overflow

SECUNIA ADVISORY ID:
SA26360

VERIFY ADVISORY:
http://secunia.com/advisories/26360/

CRITICAL:
Moderately critical

IMPACT:
DoS, System access

WHERE:
>From local network

REVISION:
1.1 originally posted 2007-08-09

OPERATING SYSTEM:
Cisco IOS 12.x
http://secunia.com/product/182/
Cisco IOS R12.x
http://secunia.com/product/50/

DESCRIPTION:
A vulnerability has been reported in Cisco IOS, which can be
exploited by malicious people to cause a DoS (Denial of Service) or
compromise a vulnerable system.

The vulnerability is caused due to a boundary error in the
implementation of the Next Hop Resolution Protocol. This can be
exploited to cause a buffer overflow by sending a specially crafted
NHRP packet containing an invalid total length in the fixed header.

Successful exploitation requires that support for the Next Hop
Resolution Protocol is enabled.

SOLUTION:
Apply updated versions or vendor workarounds (please see the vendor
advisory for details).

PROVIDED AND/OR DISCOVERED BY:
The vendor credits Martin Kluge.

CHANGELOG:
2007-08-09: Updated "Description" section with additional
information.

ORIGINAL ADVISORY:
http://www.cisco.com/warp/public/707/cisco-sa-20070808-nhrp.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
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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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