Cisco IOS cTCP Denial of Service Vulnerability - Cisco Systems

high Nessus Plugin ID 49029

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Synopsis

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

Description

A series of TCP packets may cause a denial of service (DoS) condition on Cisco IOS devices that are configured as Easy VPN servers with the Cisco Tunneling Control Protocol (cTCP) encapsulation feature. Cisco has released free software updates that address this vulnerability. No workarounds are available; however, the IPSec NAT traversal (NAT-T) feature can be used as an alternative.

Solution

Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20090325-ctcp.

See Also

http://www.nessus.org/u?eb2462c6

http://www.nessus.org/u?57f2c886

Plugin Details

Severity: High

ID: 49029

File Name: cisco-sa-20090325-ctcphttp.nasl

Version: 1.20

Type: local

Family: CISCO

Published: 9/1/2010

Updated: 11/15/2018

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C

Vulnerability Information

CPE: cpe:/o:cisco:ios

Required KB Items: Host/Cisco/IOS/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 3/25/2009

Vulnerability Publication Date: 3/25/2009

Reference Information

CVE: CVE-2009-0635

BID: 34246

CWE: 399

CISCO-SA: cisco-sa-20090325-ctcp

CISCO-BUG-ID: CSCsr16693, CSCsu21828