Cisco IOS Software Layer 2 Tunneling Protocol (L2TP) Denial of Service Vulnerability

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Synopsis :

The remote device is missing a vendor-supplied security patch.

Description :

A vulnerability exists in the Cisco IOS software implementation of
Layer 2 Tunneling Protocol (L2TP), which affects limited Cisco IOS
software releases.
Several features enable the L2TP mgmt daemon process within Cisco IOS
software, including but not limited to Layer 2 virtual private networks
(L2VPN), Layer 2 Tunnel Protocol Version 3 (L2TPv3), Stack Group
Bidding Protocol (SGBP) and Cisco Virtual Private Dial-Up Networks
(VPDN). Once this process is enabled the device is vulnerable.
This vulnerability will result in a reload of the device when
processing a specially crafted L2TP packet.
Cisco has released free software updates that address this
vulnerability.
Workarounds that mitigate this vulnerability are available.

See also :

http://www.nessus.org/u?022d1ac3
http://www.nessus.org/u?c0738c28

Solution :

Apply the relevant patch referenced in Cisco Security Advisory
cisco-sa-20080924-l2tp.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)
CVSS Temporal Score : 6.4
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: CISCO

Nessus Plugin ID: 49021 (cisco-sa-20080924-l2tphttp.nasl)

Bugtraq ID: 31358

CVE ID: CVE-2008-3813