Arbitrary file corruption in Cisco IOS XE SD-WAN Software

1) Files or Directories Accessible to External Parties

EUVDB-ID: #VU51705

Risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-1434

CWE-ID: CWE-552 - Files or Directories Accessible to External Parties

Exploit availability: No

Description

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

The vulnerability exists in the CLI of Cisco IOS XE SD-WAN due to improper input validation. A local user can overwrite and corrupt arbitrary files on the system.

The vulnerability affects the following products with enabled SD-WAN:

• 1000 Series Integrated Services Routers (ISRs)
• 4000 Series ISRs
• ASR 1000 Series Aggregation Services Routers
• Cloud Services Router 1000V Series

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Cisco SD-WAN: 17.2.0

Cisco SD-WAN vEdge Routers: All versions

External links

http://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-iosxe-arbfile-FUxskKDE
http://bst.cloudapps.cisco.com/bugsearch/bug/CSCvu39228

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.

How the attacker can exploit this vulnerability?

The attacker would have to trick the victim to open a a specially crafted file.

The attacker would have to login to the system and perform certain actions in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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