CVE-2020-7593 Memory corruption in LOGO! 8 BM (incl. SIPLUS variants)

Critical 9.8 Published 14 Jul 2020 Updated 4 Aug 2024

A remote unauthenticated attacker can trigger a buffer overflow in the web server to achieve remote code execution on Siemens LOGO! 8 BM devices.

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-2020-7593?

CVE-2020-7593 is a critical memory corruption vulnerability in Siemens AG LOGO! 8 BM (incl. SIPLUS variants), published on 14 Jul 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A vulnerability has been identified in LOGO! 8 BM (incl. SIPLUS variants) (V1.81.01 - V1.81.03), LOGO! 8 BM (incl. SIPLUS variants) (V1.82.01), LOGO! 8 BM (incl. SIPLUS variants) (V1.82.02). A buffer overflow vulnerability exists in the Web Server functionality of the device. A remote unauthenticated attacker could send a specially crafted HTTP request to cause a memory corruption, potentially resulting in remote code execution.

Weakness: CWE-120

Which versions are affected by CVE-2020-7593?

It affects 1 product.

Products include Siemens Logo\! 8 Bm Firmware.

How do I fix CVE-2020-7593?

No fix has been published for CVE-2020-7593 yet. Limit exposure of the affected software until one is available.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2020-7593 being exploited?

There is no known exploitation of CVE-2020-7593 in the wild and no public exploit code.

Sources

Also known as GHSA-x26m-wcf2-85xw.