Security restrictions bypass in SNMP Management Plane in Cisco IOS XR

1) Improper access control

EUVDB-ID: #VU50375

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1243

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a remote attacker to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to improper access restrictions in the Local Packet Transport Services (LPTS) programming of the SNMP with the management plane protection feature of Cisco IOS XR Software. A remote non-authenticated attacker can bypass implemented security restrictions and connect to SNMP server despite the management plane protection.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XR: before 7.2.12

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-snmp-7MKrW7Nq
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvt93184

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.