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Scanning for SSH Can Cause a Crash - Cisco Systems

high Nessus Plugin ID 48967

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

While fixing vulnerabilities mentioned in the Cisco Security Advisory cisco-sa-20010627-ssh, a new vulnerability was introduced in some products. When an attacker tries to exploit the vulnerability VU#945216 (described in the CERT/CC Vulnerability Note at http://www.kb.cert.org/vuls/id/945216) the SSH module will consume too much of the processor's time, effectively causing a DoS. In some cases the device will reboot. In order to be exposed SSH must be enabled on the device.
It is possible to mitigate this vulnerability by preventing, or having control over, the SSH traffic.

Solution

Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-20020627-ssh-scan.

See Also

http://www.nessus.org/u?fab8dcf4

http://www.nessus.org/u?b9451893

Plugin Details

Severity: High

ID: 48967

File Name: cisco-sa-20020627-ssh-scanhttp.nasl

Version: 1.19

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: 7.1

Temporal Score: 5.3

Vector: CVSS2#AV:N/AC:M/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: 6/27/2002

Vulnerability Publication Date: 6/27/2002

Reference Information

CVE: CVE-2002-1024

BID: 5114