CVE-2020-24987 Auth bypass in n/a

Critical 9.8 Published 4 Sep 2020 Updated 4 Aug 2024

Remote attackers can execute arbitrary code on Tenda AC18 routers by bypassing authentication in the logincheck function when the admin UI is configured to use RADIUS.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2020-24987?

CVE-2020-24987 is a critical authentication bypass vulnerability in n/a, published on 4 Sep 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Tenda AC18 Router through V15.03.05.05_EN and through V15.03.05.19(6318) CN devices could cause a remote code execution due to incorrect authentication handling of vulnerable logincheck() function in /usr/lib/lua/ngx_authserver/ngx_wdas.lua file if the administrator UI Interface is set to "radius".

Weakness: CWE-287

Which versions are affected by CVE-2020-24987?

It affects 1 product.

Products include Tendacn Ac18 Firmware.

How do I fix CVE-2020-24987?

No fix has been published for CVE-2020-24987 yet. Limit exposure of the affected software until one is available.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2020-24987 being exploited?

There is no known exploitation of CVE-2020-24987 in the wild and no public exploit code.

Sources

Also known as GHSA-q9jc-x24x-r9x9.