Cisco ASA VPN Denial of Service (CSCua91108)

Medium Nessus Plugin ID 72485

Synopsis

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

Description

A vulnerability in the VPN authentication code that handles parsing of the username from the certificate on the Cisco ASA firewall could allow an unauthenticated, remote attacker to cause a reload of the affected device.

The vulnerability is due to parallel processing of a large number of Internet Key Exchange (IKE) requests for which username-from-cert is configured. An attacker could exploit this vulnerability by sending a large number of IKE requests when the affected device is configured with the username-from-cert command. An exploit could allow the attacker to cause a reload of the affected device, leading to a denial of service (DoS) condition.

Solution

Apply the relevant patch referenced in Cisco Bug Id CSCua91108.

See Also

http://www.nessus.org/u?19ce2807

Plugin Details

Severity: Medium

ID: 72485

File Name: cisco-sn-CSCua91108-asa.nasl

Version: 1.3

Type: local

Family: CISCO

Published: 2014/02/13

Updated: 2018/11/15

Dependencies: 12634

Risk Information

Risk Factor: Medium

CVSS v2.0

Base Score: 5.4

Temporal Score: 4

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

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: cpe:/a:cisco:adaptive_security_appliance_software

Required KB Items: Host/Cisco/ASA, Host/Cisco/ASA/model

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2013/10/21

Vulnerability Publication Date: 2013/10/21

Reference Information

CVE: CVE-2013-5544

BID: 63262

CISCO-BUG-ID: CSCua91108