Exposure of Resource to Wrong Sphere in Cisco IOS XE SD-WAN Software

1) Exposure of Resource to Wrong Sphere

EUVDB-ID: #VU56861

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-2021-34723

CWE-ID: N/A

Exploit availability: No

Description

The vulnerability allows a local user to overwrite arbitrary files on the system. 

The vulnerability exists due to insufficient validation of specific CLI command parameters. A local administrator can overwrite the content of the configuration database and gain root-level access to an affected device. 

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco IOS XE SD-WAN: 17.3.1a

Cisco 1000 Series Integrated Services Routers: All versions

Cisco 4000 Series Integrated Services Routers: All versions

Cisco ASR 1000 Series Aggregation Services Routers: All versions

Cisco Cloud Services Router 1000V Series: All versions

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxesdwan-arbfileov-MVOF3ZZn

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.