Advisory Details

March 25th, 2020

(Pwn2Own) TP-Link Archer A7 SSH Port Forwarding Authentication Bypass Vulnerability

ZDI-20-340
ZDI-CAN-9664

CVE ID CVE-2020-10888
CVSS SCORE 5.9, AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
AFFECTED VENDORS TP-Link
AFFECTED PRODUCTS Archer A7
VULNERABILITY DETAILS

This vulnerability allows remote attackers to bypass authentication on affected installations of TP-Link Archer A7 AC1750 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the handling of SSH port forwarding requests during initial setup. The issue results from the lack of proper authentication prior to establishing SSH port forwarding rules. An attacker can leverage this vulnerability to escalate privileges to resources normally protected from the WAN interface.
ADDITIONAL DETAILS

Fixed in version A7(US)_V5_200220
DISCLOSURE TIMELINE
  • 2019-11-19 - Vulnerability reported to vendor
  • 2020-03-25 - Coordinated public release of advisory
CREDIT F-Secure Labs - Mark Barnes, Toby Drew, Max Van Amerongen, and James Loureiro
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