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Cisco NX-OS Software OSPF LSA Manipulation (cisco-sa-20170727-ospf)

medium Nessus Plugin ID 131396

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Synopsis

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

Description

According to its self-reported version, Cisco NX-OS Software is affected by a vulnerability involving the Open Shortest Path First (OSPF) Routing Protocol Link State Advertisement (LSA) database. An unauthenticated, remote attacker can exploit this, by injecting crafted OSPF LSA type 1 packets, to cause the targeted router to flush its routing table and propagate the crafted OSPF LSA type 1 update through the OSPF AS domain, allowing the attacker to intercept or black-hole traffic. Successful exploitation of this vulnerability requires that an attacker first accurately determine certain parameters within the LSA database on the target router.

Please see the included Cisco BIDs and Cisco Security Advisory for more information.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID(s) CSCvf28683 and CSCve47401.

See Also

http://www.nessus.org/u?5c4d1c57

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCve47401

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCvf28683

Plugin Details

Severity: Medium

ID: 131396

File Name: cisco-sa-20170727-ospf-nxos.nasl

Version: 1.10

Type: combined

Family: CISCO

Published: 11/27/2019

Updated: 1/24/2022

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 2.5

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3

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

CVSS Score Source: CVE-2017-6770

CVSS v3

Risk Factor: Medium

Base Score: 4.2

Temporal Score: 3.7

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:nx-os

Required KB Items: Host/Cisco/NX-OS/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 7/27/2017

Vulnerability Publication Date: 8/7/2017

Reference Information

CVE: CVE-2017-6770

BID: 100005