CVE-2017-6026 Weak cryptography in Schneider Electric Modicon PLCs
Insufficiently random session numbers in Schneider Electric Modicon PLCs allow attackers to compromise active user sessions.
- 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-2017-6026?
CVE-2017-6026 is a critical vulnerability in Schneider Electric Modicon PLCs, published on 30 Jun 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A Use of Insufficiently Random Values issue was discovered in Schneider Electric Modicon PLCs Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The session numbers generated by the web application are lacking randomization and are shared between several users. This may allow a current session to be compromised.
Weakness: CWE-330
Which versions are affected by CVE-2017-6026?
It affects 2 products.
Products include Schneider-Electric Modicon M241 Firmware, Schneider-Electric Modicon M251 Firmware.
How do I fix CVE-2017-6026?
No fix has been published for CVE-2017-6026 yet. Limit exposure of the affected software until one is available.
Is CVE-2017-6026 being exploited?
There is no known exploitation of CVE-2017-6026 in the wild and no public exploit code.
Public exploit code: 1 Exploit-DB entry.
Other vulnerabilities in Schneider Electric Modicon PLCs
Sources
Also known as GHSA-c4x2-m5w5-m3rx.