CVE-2023-25556 Auth bypass in Merten INSTABUS Tastermodul 1fach System M 625199
Attackers with local access can compromise KNX devices by exploiting weak authentication that accepts keys shorter than seven digits.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-25556?
CVE-2023-25556 is a high-severity authentication bypass vulnerability in Schneider Electric Merten INSTABUS Tastermodul 1fach System M 625199, published on 18 Apr 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A CWE-287: Improper Authentication vulnerability exists that could allow a device to be compromised when a key of less than seven digits is entered and the attacker has access to the KNX installation.
Weakness: CWE-287
Which versions are affected by CVE-2023-25556?
It affects 7 products.
Products include Schneider-Electric Merten Instabus Tastermodul 1fach System M Firmware, Schneider-Electric Merten Instabus Tastermodul 2fach System M Firmware, Schneider-Electric Merten Jalousie-\/Schaltaktor Reg-K\/8x\/16x\/10 M. Hb Firmware, Schneider-Electric Merten Knx Argus 180\/2\,20m Up System Firmware, Schneider-Electric Merten Knx Schaltakt.2x6a Up M.2 Eing. Firmware, Schneider-Electric Merten Knx Uni-Dimmaktor Ll Reg-K\/2x230\/300 W Firmware and 1 more.
How do I fix CVE-2023-25556?
No fix has been published for CVE-2023-25556 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-2023-25556 being exploited?
There is no known exploitation of CVE-2023-25556 in the wild and no public exploit code.
Sources
Also known as GHSA-q53x-4f23-hq3j.