Privilege escalation in Cisco IOS XR Software for Cisco 8000 Series Routers and Network Convergence System 540 Series Routers

1) OS Command Injection

EUVDB-ID: #VU50373

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1370

CWE-ID: CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to improper input validation within the CLI command of Cisco IOS XR Software for the Cisco 8000 Series Routers and Network Convergence System 540 Series Routers running NCS540L software images. A local user can run a specially crafted command and execute arbitrary code on the system with root privileges.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco ASR 9000 Series Aggregation Services Routers: before 7.2.1.15i.BASE

Cisco 8000 Series Routers: before 7.2.1.15i.BASE

Cisco Network Convergence System 5000 Series: before 7.2.1.15i.BASE

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxr-pe-QpzCAePe
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvs35027

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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