PT-2020-5572 · Rockwell Automation · Allen-Bradley Micrologix 1100

Published 2020-10-13 · Updated 2022-05-12 · CVE-2020-6111

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 Allen-Bradley MicroLogix 1100 Programmable Logic Controller Systems Series B FRN 10.000 through Series B FRN 16.000

Description An exploitable denial-of-service issue exists in the IPv4 functionality. A specially crafted packet can cause a major error, resulting in a denial of service. An attacker can send a malicious packet to trigger this issue. The vulnerability is related to errors in number processing.

Recommendations For Allen-Bradley MicroLogix 1100 Programmable Logic Controller Systems Series B FRN 10.000 through Series B FRN 16.000, consider implementing network traffic filtering to restrict malicious packets. As a temporary workaround, restrict access to the IPv4 functionality until a patch is available. At the moment, there is no information about a newer version that contains a fix for this issue.

Fix

RCE

Weakness Enumeration

CWE-189

CWE-20

Related Identifiers

BDU:2021-01172

CVE-2020-6111

Affected Products

Allen-Bradley Micrologix 1100

References · 10

• https://osv.dev/vulnerability/CVE-2020-6111 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-6111 · Security Note
• https://bdu.fstec.ru/vul/2021-01172 · Security Note
• https://us-cert.cisa.gov/ics/advisories/icsa-21-047-02 · Note
• https://t.me/cvenotify/6517 · Telegram Post
• https://us-cert.gov/ics/advisories/icsa-21-047-02 · Note
• https://t.me/cibsecurity/17085 · Telegram Post
• https://talosintelligence.com/vulnerability_reports/TALOS-2020-1057 · Note
• https://t.me/cvenotify/6707 · Telegram Post
• https://cybersecurity-help.cz/vdb/SB2020101370 · Note