Advisory Details

February 22nd, 2022

(Pwn2Own) Cisco RV340 utility-ping-request Insecure Temporary File Local Privilege Escalation Vulnerability

ZDI-22-420
ZDI-CAN-15946

CVE ID CVE-2022-20702
CVSS SCORE 7.0, (AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS Cisco
AFFECTED PRODUCTS RV340
VULNERABILITY DETAILS

This vulnerability allows local attackers to escalate privileges on affected installations of Cisco RV340 routers. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the utility-ping-request script. The issue results from the creation of a temporary file with insecure permissions. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary 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
  • 2021-12-10 - Vulnerability reported to vendor
  • 2022-02-22 - Coordinated public release of advisory
CREDIT Jeongun Baek of Diffense
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