PT-2022-10664 · Mdt · Mdt Knx Ip Interface Scn-Ip000.03+1

Published 2022-04-02 · Updated 2022-05-03 · CVE-2021-37740

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions MDT KNXnet/IP Secure router SCN-IP100.03 versions prior to 3.0.4 MDT KNX IP interface SCN-IP000.03 versions prior to 3.0.4

Description A denial of service issue exists in the firmware of the affected devices, allowing a remote attacker to make the device unresponsive to all requests on the KNXnet/IP Secure layer until it is rebooted. This is achieved via a SESSION REQUEST frame with a modified total length field.

Recommendations For MDT KNXnet/IP Secure router SCN-IP100.03 versions prior to 3.0.4, update to version 3.0.4 or later to resolve the issue. For MDT KNX IP interface SCN-IP000.03 versions prior to 3.0.4, update to version 3.0.4 or later to resolve the issue. As a temporary workaround, consider restricting access to the SESSION REQUEST frame to minimize the risk of exploitation.

Exploit

Fix

Related Identifiers

CVE-2021-37740

Affected Products

Mdt Knx Ip Interface Scn-Ip000.03

Mdt Knxnet/Ip Secure Router Scn-Ip100.03

References · 8

• 🔥 https://github.com/robertguetzkow/CVE-2021-37740 · Exploit
• https://osv.dev/vulnerability/CVE-2021-37740 · Vendor Advisory
• https://mdt.de/download/MDT_CL_SCN_IP_03_IP_Interface_Router.pdf · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-37740 · Security Note
• https://t.me/cvenotify/29247 · Telegram Post
• https://t.me/cibsecurity/41200 · Telegram Post
• https://mdt.de/EN_IP_Interface_Router.html · Note
• https://t.me/secharvester/12250 · Telegram Post