Advisory Details

March 25th, 2020

(Pwn2Own) TP-Link Archer A7 Protection Mechanism Failure Firewall Bypass Vulnerability

ZDI-20-338
ZDI-CAN-9663

CVE ID CVE-2020-10887
CVSS SCORE 8.1, (AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H)
AFFECTED VENDORS TP-Link
AFFECTED PRODUCTS Archer A7
VULNERABILITY DETAILS

This vulnerability allows a firewall bypass 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 IPv6 connections. The issue results from the lack of proper filtering of IPv6 SSH connections. An attacker can leverage this in conjunction with other vulnerabilities to execute code in the context of root.

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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