PT-2017-10926 · Coppia Technology · Snap7 Server

Martin T · Published 2017-11-17 · Updated 2017-12-02 · CVE-2017-1000230

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Snap7 Server version 1.4.1

Description The issue allows for a denial of service attack when the ItemCount field of the ReadVar or WriteVar functions in the S7 protocol implementation is provided with unexpected input, causing the Snap7 Server to crash.

Recommendations For Snap7 Server version 1.4.1, as a temporary workaround, consider restricting access to the ReadVar and WriteVar functions until a patch is available. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Weakness Enumeration

CWE-20

Related Identifiers

CVE-2017-1000230

Affected Products

Snap7 Server

References · 3

• https://nvd.nist.gov/vuln/detail/CVE-2017-1000230 · Security Note
• https://osv.dev/vulnerability/CVE-2017-1000230 · Vendor Advisory
• https://sourceforge.net/p/snap7/discussion/bugfix/thread/2d2d085c · Note