Advisory Details

February 22nd, 2022

(Pwn2Own) Cisco RV340 SSLVPN Stack-based Buffer Overflow Remote Code Execution Vulnerability

CVE ID	CVE-2022-20699
CVSS SCORE	9.8, AV:N/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 remote 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 SSL VPN service, which listens on TCP port 8443 by default. The issue results from the lack of proper validation of the length of user-supplied data prior to copying it to a fixed-length stack-based buffer. 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	2021-12-01 - Vulnerability reported to vendor 2022-02-22 - Coordinated public release of advisory
CREDIT	Flashback Team: Pedro Ribeiro (@pedrib1337) && Radek Domanski (@RabbitPro)

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