vulnwire
6.5med

CVE-2017-6030

Schneider Electric Modicon PLCs Predictable Value Range from Previous Values

Published 9 y ago · modified 4 mo ago · JSON

CVSS
6.5
v3.1 · CNA
CISA KEV
No
not known exploited
EPSS
2.2%
percentile 82%
Public exploits
0
none known

A predictable value range from previous values issue was discovered in Schneider Electric Modicon PLCs Modicon M221, firmware versions prior to Version 1.5.0.0, Modicon M241, firmware versions prior to Version 4.0.5.11, and Modicon M251, firmware versions prior to Version 4.0.5.11. The affected products generate insufficiently random TCP initial sequence numbers that may allow an attacker to predict the numbers from previous values. This may allow an attacker to spoof or disrupt TCP connections.

CISA SSVC assessment

Exploitation
none
Automatable
yes
Technical impact
partial
Assessed
5 mo ago

Exploit prediction (EPSS)

2.18% probability of exploitation in the next 30 days, higher than 82% of all scored CVEs.

CVSS scores

Assigned byVersionScoreVector
CISA ADP3.16.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
NVD3.16.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
CNA3.16.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
NVD2.06.4AV:N/AC:L/Au:N/C:N/I:P/A:P

Affected products

  • Schneider Electric Modicon M221
  • Schneider Electric Modicon M241
  • Schneider Electric Modicon M251

Classification

Weakness
  • CWE-343 Predictable Value Range from Previous Values
  • CWE-331 Insufficient Entropy

References

  • ics-cert.us-cert.gov /advisories/ICSA-17-089-02 · x_refsource_MISC, x_transferred
  • securityfocus.com /bid/97254 · vdb-entry, x_refsource_BID, x_transferred
  • github.com /cisagov/CSAF/blob/develop/csaf_files/OT/white/2017/icsa-17-089-02.json

Sources

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