Multiple vulnerabilities in Cisco IOS XR Software for Cisco 8000 and Network Convergence System 540 Series Routers

Published: 2021-09-09

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2021-34708 CVE-2021-34709
CWE-ID	CWE-347
Exploitation vector	Local
Public exploit	N/A
Vulnerable software Subscribe	Cisco 8000 Series Routers Hardware solutions / Routers & switches, VoIP, GSM, etc Cisco Network Convergence System 540 Series Routers Hardware solutions / Routers & switches, VoIP, GSM, etc
Vendor

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU56424

Risk: Low

CVSSv3.1: 5.8 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-34708

CWE-ID: CWE-347 - Improper Verification of Cryptographic Signature

Exploit availability: No

Description

The vulnerability allows a local administrator to execute arbitrary code on the system.

The vulnerability exists due to an unsigned script within the ISO that is not verified when the install request is being processed. A local administrator can modify an ISO image and execute arbitrary code on the affected device.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco 8000 Series Routers: before 7.3.15

Cisco Network Convergence System 540 Series Routers: before 7.4.1

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-lnt-QN9mCzwn

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.

2) Improper Verification of Cryptographic Signature

EUVDB-ID: #VU56425