Improper access control in Cisco Systems, Inc products - CVE-2021-34724

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Main Vulnerability Database Vulnerabilities #VU56835

Improper access control in Cisco Systems, Inc products - CVE-2021-34724

Published: September 23, 2021


Vulnerability identifier: #VU56835
CSH Severity: Low
CVSS v4: 8.3 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-34724
CWE-ID: CWE-284
Exploitation vector: Local access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a local user to gain unauthorized access to otherwise restricted functionality.

The vulnerability exists due to insufficient file system protection and the presence of a sensitive file in the bootflash directory. A local administrator can overwrite an installer file stored in the bootflash directory with arbitrary commands to read and write changes to the configuration database on the affected device.


Affected software

Cisco 1000 Series Integrated Services Routers
Cisco 4000 Series Integrated Services Routers
Cisco ASR 1000 Series Aggregation Services Routers
Cisco Cloud Services Router 1000V Series
Cisco IOS XE SD-WAN

How to mitigate CVE-2021-34724

Install updates from vendor's website.

Cisco IOS XE SD-WAN - addressed in versions 17.3.3, 17.3.4a, 17.4.2, 17.5.1a

External References

Related Security Bulletins