Cisco NX-OS OTV GRE Packet Header Parameter Handling RCE (cisco-sa-20161005-otv)

critical Nessus Plugin ID 94109

Synopsis

The remote device is affected by a buffer overflow vulnerability.

Description

According to its version and configuration, the Cisco NX-OS software running on the remote device is affected by a remote code execution vulnerability in the Overlay Transport Virtualization (OTV) generic routing encapsulation (GRE) feature due to improper validation of the size of OTV packet header parameters. An unauthenticated, remote attacker can exploit this, via long parameters in a packet header, to cause a denial of service condition or the execution of arbitrary code.

Solution

Upgrade to the relevant fixed version referenced in Cisco advisory cisco-sa-20161005-otv. Alternatively, as a workaround, configure an Access Control List (ACL) to drop malformed OTV control packets.

See Also

http://www.nessus.org/u?c3d6721f

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCuy95701

Plugin Details

Severity: Critical

ID: 94109

File Name: cisco-sa-20161005-otv-nxos.nasl

Version: 1.10

Type: combined

Family: CISCO

Published: 10/18/2016

Updated: 11/14/2019

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: AV:N/AC:L/Au:N/C:C/I:C/A:C

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

CVSS v3

Risk Factor: Critical

Base Score: 9.8

Temporal Score: 8.5

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

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

Vulnerability Information

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

Required KB Items: Host/Cisco/NX-OS/Version, Host/Cisco/NX-OS/Device, Host/Cisco/NX-OS/Model

Exploit Ease: No known exploits are available

Patch Publication Date: 10/5/2016

Vulnerability Publication Date: 10/5/2016

Reference Information

CVE: CVE-2016-1453

BID: 93409

CISCO-BUG-ID: CSCuy95701

CISCO-SA: cisco-sa-20161005-otv