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Cisco IOS DFS Access List Leakage - Cisco Systems

high Nessus Plugin ID 48945

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

Errors in certain Cisco IOS software versions for certain routers can cause IP datagrams to be output to network interfaces even though access lists have been applied to filter those datagrams. This applies to routers from the Cisco 7xxx family only, and only when those routers have been configured for distributed fast switching (DFS). There are two independent vulnerabilities, which have been given Cisco bug IDs CSCdk35564 and CSCdk43862. Each vulnerability affects only a specialized subset of DFS configurations. Affected configurations are not believed to be extremely common, but neither are they extremely rare. More details of affected configurations are in the "Who is Affected" section of this document. These vulnerabilities may permit users to send packets to parts of the customer's network for which they are not authorized. This may permit unauthorized access or other attacks on customer computer systems or data. Cisco does not know of any incidents in which these vulnerabilities have actually been exploited by attackers. Neither vulnerability affects any Cisco product other than routers in the 70xx or 75xx series. Of 70xx routers, only routers with the optional route-switch processor (RSP) card are affected. Additional configuration conditions apply.

Solution

Apply the relevant patch referenced in Cisco Security Advisory cisco-sa-19981105-ios-dfs-acl.

See Also

http://www.nessus.org/u?860d3da1

http://www.nessus.org/u?d1c7b10c

Plugin Details

Severity: High

ID: 48945

File Name: cisco-sa-19981105-ios-dfs-aclhttp.nasl

Version: 1.14

Type: local

Family: CISCO

Published: 9/1/2010

Updated: 11/15/2018

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: High

Base Score: 7.5

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

Patch Publication Date: 11/5/1998

Vulnerability Publication Date: 11/5/1998

Reference Information

CVE: CVE-1999-1464, CVE-1999-1465