Detections
Analytics

Cisco CHAP Authentication Vulnerabilities - Cisco Systems

high Nessus Plugin ID 48944

Language:

Synopsis

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

Description

A serious security vulnerability (bug ID CSCdi91594) exists in PPP CHAP authentication in all "classic" Cisco IOS software versions (the software used on Cisco non-switch products with product numbers greater than or equal to 1000, on the AGS/AGS+/CGS/MGS, and on the CS-500, but not on Catalyst switches or on 7xx or 9xx routers) starting with the introduction of CHAP support in release 9.1(1). The vulnerability permits attackers with appropriate skills and knowledge to completely circumvent CHAP authentication. Other PPP authentication methods are not affected. A related vulnerability exists in Cisco IOS/700 software (the software used on 7xx routers). A configuration workaround exists for IOS/700, and a complete fix for 76x and 77x routers will be included in software version 4.1(2), due to be released by December, 1997. A fix for 75x routers is scheduled for the first half of 1998.

Solution

Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-19971001-chap.

See Also

http://www.nessus.org/u?cc6f64a7

http://www.nessus.org/u?180118a7

Plugin Details

Severity: High

ID: 48944

File Name: cisco-sa-19971001-chaphttp.nasl

Version: 1.12

Type: local

Family: CISCO

Published: 9/1/2010

Updated: 11/15/2018

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 6.1

CVSS v2

Risk Factor: High

Base Score: 7.5

Temporal Score: 5.5

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

Vulnerability Information

CPE: cpe:/o:cisco:ios

Required KB Items: Host/Cisco/IOS/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 10/1/1997

Vulnerability Publication Date: 10/1/1997

Reference Information

CVE: CVE-1999-0160

BID: 693