Detections
Analytics
Cisco IOS XE Software DNS NAT Protocol Application Layer Gateway DoS (cisco-sa-alg-dos-hbBS7SZE)
high Nessus Plugin ID 152176
Language:
Synopsis
The remote device is missing a vendor-supplied security patchDescription
According to its self-reported version, Cisco IOS-XE Software is affected by a denial of service vulnerability in the DNS Application Layer Gateway (ALG) functionality used by Network Address Translation (NAT). The vulnerability is due to a logic error that occurs when an affected device inspects certain DNS packets. An unauthenticated, remote attacker can exploit this, by sending crafted DNS packets through an affected device that is performing NAT for DNS packets, to cause the device to reload.Please see the included Cisco BID and Cisco Security Advisory for more information.
Solution
Upgrade to the relevant fixed version referenced in Cisco bug ID CSCvv65113See Also
http://www.nessus.org/u?f9821b8b
http://tools.cisco.com/security/center/viewErp.x?alertId=ERP-74408
Plugin Details
Severity: High
ID: 152176
File Name: cisco-sa-alg-dos-hbBS7SZE-iosxe.nasl
Version: 1.5
Type: combined
Family: CISCO
Published: 8/2/2021
Updated: 8/3/2021
Supported Sensors: Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.6
CVSS v2
Risk Factor: High
Base Score: 7.1
Temporal Score: 5.3
Vector: CVSS2#AV:N/AC:M/Au:N/C:N/I:N/A:C
CVSS Score Source: CVE-2021-1446
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: 3/24/2021
Vulnerability Publication Date: 3/24/2021
Reference Information
CVE: CVE-2021-1446