CVE-2020-25705 Information disclosure in Siemens Lunux Based Products

High 7.4 Published 17 Nov 2020 Updated 4 Aug 2024

An attacker can bypass UDP source port randomization to scan open ports, exposing network topology information on affected Linux-based systems.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2020-25705?

CVE-2020-25705 is a high-severity vulnerability in Linux kernel, published on 17 Nov 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw allows an off-path remote attacker to effectively bypass source port UDP randomization. Software that relies on UDP source port randomization are indirectly affected as well on the Linux Based Products (RUGGEDCOM RM1224: All versions between v5.0 and v6.4, SCALANCE M-800: All versions between v5.0 and v6.4, SCALANCE S615: All versions between v5.0 and v6.4, SCALANCE SC-600: All versions prior to v2.1.3, SCALANCE W1750D: v8.3.0.1, v8.6.0, and v8.7.0, SIMATIC Cloud Connect 7: All versions, SIMATIC MV500 Family: All versions, SIMATIC NET CP 1243-1 (incl. SIPLUS variants): Versions 3.1.39 and later, SIMATIC NET CP 1243-7 LTE EU: Version

Weakness: CWE-330

Which versions are affected by CVE-2020-25705?

It affects 2 products.

Products include Linux kernel, Redhat Enterprise Linux.

How do I fix CVE-2020-25705?

Apply the vendor's patch.

Is CVE-2020-25705 being exploited?

There is no known exploitation of CVE-2020-25705 in the wild and no public exploit code.

Public exploit code: 2 proofs of concept on GitHub.

All Linux kernel vulnerabilities

Sources

Also known as A-174737972, ASB-A-174737972, DEBIAN-CVE-2020-25705, GHSA-33cf-w34p-g6pj, UBUNTU-CVE-2020-25705.