CVE-2019-6855 Auth bypass in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10)
Attackers can bypass authentication between EcoStruxure Control Expert and Modicon controllers, allowing unauthorized access to industrial control systems.
- 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-2019-6855?
CVE-2019-6855 is a high-severity authentication bypass vulnerability in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10), published on 6 Jan 2020. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Incorrect Authorization vulnerability exists in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10), which could cause a bypass of the authentication process between EcoStruxure Control Expert and the M340 and M580 controllers.
Weakness: CWE-863
Which versions are affected by CVE-2019-6855?
It affects 23 products.
Products include Schneider-Electric Ecostruxure Control Expert, Schneider-Electric Modicon M340 Bmxp341000 Firmware, Schneider-Electric Modicon M340 Bmxp342000 Firmware, Schneider-Electric Modicon M340 Bmxp3420102 Firmware, Schneider-Electric Modicon M340 Bmxp342020 Firmware, Schneider-Electric Modicon M340 Bmxp3420302 Firmware and 17 more.
How do I fix CVE-2019-6855?
No fix has been published for CVE-2019-6855 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-2019-6855 being exploited?
There is no known exploitation of CVE-2019-6855 in the wild and no public exploit code.
Other vulnerabilities in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20) , and Modicon M580 (all versions prior to V3.10)
- CVE-2022-37300 Auth bypass in EcoStruxure Control Expert
- CVE-2020-28212 Auth bypass in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions)
- CVE-2020-7475 Code injection in EcoStruxure Control Expert (all versions prior to 14.1 Hot Fix), Unity Pro (all versions), Modicon M340 (all versions prior to V3.20), Modicon M580 (all versions prior to V3.10)
- CVE-2023-27976 Other in EcoStruxure Control Expert
- CVE-2020-28213 Code injection in PLC Simulator on EcoStruxureª Control Expert (now Unity Pro) (all versions)
Sources
Also known as GHSA-f79p-hq3g-prjw.