Advisory Details

May 9th, 2022

Cisco RV340 JSON RPC set-snmp Command Injection Remote Code Execution Vulnerability

ZDI-22-723
ZDI-CAN-15633

CVE ID CVE-2022-20801
CVSS SCORE 4.3, (AV:A/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:L)
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. Although authentication is required to exploit this vulnerability, the existing authentication mechanism can be bypassed.

The specific flaw exists within the handling of set-snmp JSON RPC requests. When parsing the usmUserPrivKey parameter, the process does not properly validate a user-supplied string before using it to execute a system call. An attacker can leverage this vulnerability to execute code in the context of the www-data user.

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-rv-cmd-inj-8Pv9JMJD
DISCLOSURE TIMELINE
  • 2022-01-07 - Vulnerability reported to vendor
  • 2022-05-09 - Coordinated public release of advisory
CREDIT Anonymous
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