Cisco IOS XE Software NAT Session Initiation Protocol Application Layer Gateway DoS (cisco-sa-20190925-sip-alg)

high Nessus Plugin ID 129780

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Synopsis

The remote device is missing a vendor-supplied security patch

Description

According to its self-reported version, Cisco IOS XE Software is affected by a denial of service (DoS) vulnerability in the Network Address Translation (NAT) Session Initiation Protocl (SIP) Application Layer Gateway (ALG). This allows an unauthenticated, remote attacker to cause an affected device to reload. The vulnerability is due to improper processing of transient SIP packets on which NAT is performed on an affected device. An attacker can exploit this vulnerability by using UDP port 5060 to send crafted SIP packets through an affected device that is performing NAT for SIP packets. A successful exploit could allow an attacker to cause the device to reload, resulting in a DoS condition.

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 CSCvn65912

Plugin Details

Severity: High

ID: 129780

File Name: cisco-sa-20190925-sip-alg.nasl

Version: 1.9

Type: local

Family: CISCO

Published: 10/10/2019

Updated: 1/8/2021

Supported Sensors: Nessus

Risk Information

VPR

Risk Factor: Low

Score: 3.6

CVSS v2

Risk Factor: High

Base Score: 7.8

Temporal Score: 5.8

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

CVSS Score Source: CVE-2019-12646

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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: 9/25/2019

Vulnerability Publication Date: 9/25/2019

Reference Information

CVE: CVE-2019-12646

CWE: 399

CISCO-SA: cisco-sa-20190925-sip-alg

IAVA: 2019-A-0352-S

CISCO-BUG-ID: CSCvn65912

Detections

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