7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
10 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
0.002 Low
EPSS
Percentile
58.9%
**ATTENTION:**Remotely exploitable/Low skill level to exploit.
Vendor: Schweitzer Engineering Laboratories, Inc. (SEL)
Equipment: SEL-3620, SEL-3622
Vulnerability: Improper Access Control
The following versions of SEL-3620 and SEL-3622, an Ethernet Security Gateway, are affected:
This behavior could result in unauthorized communications through the SEL-3620 and SEL-3622 to configured NAT port forwarding destinations.
SEL has determined that, when NAT port forwarding is not used, all routed traffic is filtered properly through the firewall access control lists. If NAT port forwarding is required, SEL recommends that users of affected products contact their SEL Sales Representative or Customer Service Representative to obtain a no-cost firmware upgrade CD-ROM packet including upgrade instructions.
Contact can be made at the following location:
<https://selinc.com/support/?categories.Sales>
NCCIC/ICS-CERT recommends that users take defensive measures to minimize the risk of exploitation of this vulnerability. Specifically, users should:
ICS-CERT reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures.
ICS-CERT also provides a section for control systems security recommended practices on the ICS-CERT web page. Several recommended practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies.
Additional mitigation guidance and recommended practices are publicly available in the ICSβCERT Technical Information Paper, ICS-TIP-12-146-01BβTargeted Cyber Intrusion Detection and Mitigation Strategies, that is available for download from the ICS-CERT web site.
Organizations observing any suspected malicious activity should follow their established internal procedures and report their findings to ICS-CERT for tracking and correlation against other incidents.
No known public exploits specifically target this vulnerability.
The device does not properly enforce access control while configured for NAT port forwarding, which may allow for unauthorized communications to downstream devices.
CVE-2017-7928 has been assigned to this vulnerability. A CVSS v3 base score of 7.2 has been assigned; the CVSS vector string is (AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N).
Jason Holcomb with Revolutionary Security discovered the vulnerability and has tested the patch.
Critical Infrastructure Sector: Energy
Countries/Areas Deployed: Worldwide
Company Headquarters Location: Pullman, Washington
web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2017-7928
cwe.mitre.org/data/definitions/284.html
public.govdelivery.com/accounts/USDHSCISA/subscriber/new?topic_id=USDHSCISA_138
selinc.com/support/?categories.Sales
twitter.com/CISAgov
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www.first.org/cvss/calculator/3.0#CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:L/A:N
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7.5 High
CVSS2
Attack Vector
NETWORK
Attack Complexity
LOW
Authentication
NONE
Confidentiality Impact
PARTIAL
Integrity Impact
PARTIAL
Availability Impact
PARTIAL
AV:N/AC:L/Au:N/C:P/I:P/A:P
10 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
CHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
0.002 Low
EPSS
Percentile
58.9%