PT-2021-7767 · 3S Smart Software Solutions · Codesys Development System

Published 2021-08-02 · Updated 2022-09-03 · CVE-2021-21865

Positive Technologies (AI Summary)

CVSS v3.1

8.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions CODESYS Development System version 3.5.16

Description A unsafe deserialization vulnerability exists in the PackageManagement.plugin ExtensionMethods.Clone() functionality. This vulnerability can be triggered by a specially crafted file, leading to arbitrary command execution. An attacker can provide a malicious file to exploit this issue.

Recommendations For version 3.5.16, consider disabling the ExtensionMethods.Clone() function as a temporary workaround until a patch is available. Restrict access to the PackageManagement.plugin to minimize the risk of exploitation. Avoid using malicious files that can trigger this vulnerability. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Deserialization of Untrusted Data

Weakness Enumeration

CWE-502

Related Identifiers

BDU:2023-02707

CVE-2021-21865

Affected Products

Codesys Development System

References · 10

• https://bdu.fstec.ru/vul/2023-02707 · Security Note
• https://customers.codesys.com/index.php?eID=dumpFile&t=f&f=16805&token=ee583c498941d9fda86490bca98ff21928eec08a&download= · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-21865 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-21865 · Security Note
• https://t.me/cvenotify/18623 · Telegram Post
• https://customers.codesys.com/index.phpeID=dumpFile&t=f&f=16805&token=ee583c498941d9fda86490bca98ff21928eec08a&download= · Note
• https://talosintelligence.com/vulnerability_reports/TALOS-2021-1301 · Note
• https://t.me/cibsecurity/26708 · Telegram Post
• https://customers.codesys.com/index.phpeID=dumpFile&t=f&f=16805&token=ee583c498941d9fda86490bca98ff21928eec08a&download= · Note
• https://se.com/ae/en/download/document/SEVD-2022-011-06 · Note