(Pwn2Own) TP-Link Omada ER605 PPTP VPN username Command Injection Remote Code Execution Vulnerability
May 23rd, 2024
Vulnerability Details
This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of TP-Link Omada ER605 routers. Authentication is not required to exploit this vulnerability. However, devices are only vulnerable if configured to use a PPTP VPN with LDAP authentication.
The specific flaw exists within the handling of the username parameter provided to the /usr/bin/pppd endpoint. The issue results from the lack of proper validation of 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 root.
Additional Details
Fixed in firmware ER605 (UN) _V2_2. 2.4 Build 20240119
https://www.tp-link.com/en/support/download/er605/#Firmware
Disclosure Timeline
- 2023-11-09 - Vulnerability reported to vendor
- 2024-05-23 - Coordinated public release of advisory
- 2024-07-01 - Advisory Updated
Credit
Chris Anastasio @mufinnnnnnn
