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TITLE:
Nortel VPN Routers IKE Packet Handling Denial of Service

SECUNIA ADVISORY ID:
SA15548

VERIFY ADVISORY:
http://secunia.com/advisories/15548/

CRITICAL:
Moderately critical

IMPACT:
DoS

WHERE:
>From remote

OPERATING SYSTEM:
Nortel VPN Routers
http://secunia.com/product/2426/

DESCRIPTION:
NTA-Monitor has reported a vulnerability in Nortel VPN Routers, which
can be exploited by malicious people to cause a DoS (Denial of
Service).

The vulnerability is caused due to an error in the handling of IKE
packets and can be exploited via a specially crafted IKE packet
containing a malformed ISAKMP header.

Successful exploitation causes the VPN router to crash or reboot.

The vulnerability has been reported in the 600, 1010, 1050, 1100,
1600, 1700, 1740, 2600, 2700, 4500, 4600, and 5000 models.

SOLUTION:
Upgrade to version 5.05.200 or install patched version of 4.76, 4.85,
4.90, or 5.00 when available.

PROVIDED AND/OR DISCOVERED BY:
Roy Hills, NTA-Monitor.

ORIGINAL ADVISORY:
NTA-Monitor:
http://www.nta-monitor.com/news/vpn-flaws/nortel/vpn-router-dos/

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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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