Insufficient Randomization in Schneider Electric Modicon PLCs
CVE-2017-6026

9.1CRITICAL

Key Information:

Vendor
Schneider Electric
Status
Schneider Electric Modicon Plcs
Vendor
CVE Published:
30 June 2017

Summary

A vulnerability exists in Schneider Electric's Modicon PLCs, specifically in the M241 and M251 models, where session numbers generated by the web application lack sufficient randomization. This deficiency causes session identifiers to be shared among multiple users, significantly increasing the likelihood of a session being commandeered by unauthorized parties. Users on older firmware versions are particularly at risk, as this issue can jeopardize the integrity and confidentiality of user sessions, potentially allowing malicious actors to exploit the vulnerability for unauthorized access.

Affected Version(s)

Schneider Electric Modicon PLCs Schneider Electric Modicon PLCs

References

https://ics-cert.us-cert.gov/advisories/ICSA-17-089-02
x_refsource_MISC
http://www.securityfocus.com/bid/97254
vdb-entryx_refsource_BID
https://www.exploit-db.com/exploits/45918/
exploitx_refsource_EXPLOIT-DB

EPSS Score

14% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
9.1
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.