Cisco IOS XE TL1 Request Handling RCE (cisco-sa-20161102-tl1)

critical Nessus Plugin ID 94680

Synopsis

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

Description

According to its self-reported version and model, the Cisco IOS XE software running on the remote ASR device is affected by a remote code execution vulnerability in the Transaction Language 1 (TL1) code due to an overflow condition caused by improper bounds checking on certain input when handling TL1 requests. An unauthenticated, remote attacker can exploit this, via a specially crafted request to the TL1 port, to cause a denial of service condition or the execution of arbitrary code.

Solution

Upgrade to the relevant fixed version referenced in Cisco bug ID CSCuy15175. Alternatively, as a mitigation, deploy infrastructure access control lists (iACLs) to prevent TL1 packets from reaching the device.

See Also

http://www.nessus.org/u?1cb66121

https://bst.cloudapps.cisco.com/bugsearch/bug/CSCuy15175

Plugin Details

Severity: Critical

ID: 94680

File Name: cisco-sa-20161102-tl1.nasl

Version: 1.7

Type: combined

Family: CISCO

Published: 11/10/2016

Updated: 5/3/2024

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 5.9

CVSS v2

Risk Factor: Critical

Base Score: 10

Temporal Score: 7.4

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A: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: CVSS:3.0/E:U/RL:O/RC:C

Vulnerability Information

CPE: cpe:/o:cisco:ios_xe

Required KB Items: Host/Cisco/IOS-XE/Version

Exploit Ease: No known exploits are available

Patch Publication Date: 11/2/2016

Vulnerability Publication Date: 11/2/2016

Reference Information

CVE: CVE-2016-6441

BID: 94072

CISCO-SA: cisco-sa-20161102-tl1

IAVA: 2017-A-0002-S

CISCO-BUG-ID: CSCuy15175