Advisory Details

March 25th, 2020

(Pwn2Own) TP-Link Archer A7 tmpServer Command Injection Remote Code Execution Vulnerability

ZDI-20-339
ZDI-CAN-9662

CVE ID CVE-2020-10886
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 remote attackers to execute arbitrary code on affected installations of TP-Link Archer A7 AC1750 routers. Authentication is not required to exploit this vulnerability.

The specific flaw exists within the tmpServer service, which listens on TCP port 20002. 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 the current process.
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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