CVE-2020-36178 Command injection in n/a

Critical 9.8 Published 6 Jan 2021 Updated 4 Aug 2024

Attackers can execute arbitrary OS commands on TP-Link TL-WR840N routers via IP address fields in the web interface due to unsafe system calls.

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-2020-36178?

CVE-2020-36178 is a critical command injection vulnerability in n/a, published on 6 Jan 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

oal_ipt_addBridgeIsolationRules on TP-Link TL-WR840N 6_EU_0.9.1_4.16 devices allows OS command injection because a raw string entered from the web interface (an IP address field) is used directly for a call to the system library function (for iptables). NOTE: oal_ipt_addBridgeIsolationRules is not the only function that calls util_execSystem.

Weakness: CWE-78

Which versions are affected by CVE-2020-36178?

It affects 1 product.

Products include Tp-Link Tl-Wr840n Firmware.

How do I fix CVE-2020-36178?

No fix has been published for CVE-2020-36178 yet. Limit exposure of the affected software until one is available.

Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.

Is CVE-2020-36178 being exploited?

There is no known exploitation of CVE-2020-36178 in the wild and no public exploit code.

Sources

Also known as GHSA-qqg6-4j54-68gr.