(Pwn2Own) Cisco RV340 Firmware Update Missing Integrity Check Remote Code Execution Vulnerability

February 22nd, 2022
ZDI-22-408 ZDI-CAN-15611

CVE ID

CVE-2022-20703

CVSS Score

8.8 AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Cisco

Affected Products

RV340

Vulnerability Details

This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of Cisco RV340 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of firmware updates. The issue results from the lack of proper validation of a firmware image when performing an upgrade. An attacker can leverage this vulnerability to execute code in the context of root.

Additional Details

Cisco has issued an update to correct this vulnerability. More details can be found at:
https://tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-smb-mult-vuln-KA9PK6D

Disclosure Timeline

  • 2021-11-24 - Vulnerability reported to vendor
  • 2022-02-22 - Coordinated public release of advisory

Credit

Bien Pham (@bienpnn) from Team Orca of Sea Security (security.sea.com)

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