Detections
Analytics
Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway DoS (cisco-sa-alg-dos-KU9Z8kFX)
high Nessus Plugin ID 165762
Language:
Synopsis
The remote device is missing a vendor-supplied security patchDescription
A vulnerability in the DNS application layer gateway (ALG) functionality that is used by Network Address Translation (NAT) in Cisco IOS XE Software could allow an unauthenticated, remote attacker to cause an affected device to reload. This vulnerability is due to a logic error that occurs when an affected device inspects certain TCP DNS packets. An attacker could exploit this vulnerability by sending crafted DNS packets through the affected device that is performing NAT for DNS packets. A successful exploit could allow the attacker to cause the device to reload, resulting in a denial of service (DoS) condition on the affected device.Please see the included Cisco BIDs and Cisco Security Advisory for more information.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCwa78096See Also
http://www.nessus.org/u?89f41eff
https://tools.cisco.com/security/center/viewErp.x?alertId=ERP-74745
Plugin Details
Severity: High
ID: 165762
File Name: cisco-sa-alg-dos-KU9Z8kFX-iosxe.nasl
Version: 1.5
Type: combined
Family: CISCO
Published: 10/7/2022
Updated: 10/10/2022
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Medium
Score: 4.4
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-2022-20837
CVSS v3
Risk Factor: High
Base Score: 8.6
Temporal Score: 7.5
Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/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, Host/Cisco/IOS-XE/Model
Exploit Ease: No known exploits are available
Patch Publication Date: 9/28/2022
Vulnerability Publication Date: 9/28/2022
Reference Information
CVE: CVE-2022-20837