PT-2021-11671 · Unknown · Opc Ua .Net Standard Stack

Published 2021-02-16 · Updated 2021-11-19 · CVE-2020-29457

Positive Technologies (AI Summary)

CVSS v3.1

4.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: OPC UA .NET Standard Stack version 1.4.363.107

Description: A Privilege Elevation issue in the OPC UA .NET Standard Stack could allow a rogue application to establish a secure connection. This is achieved by allowing attackers to establish a connection using invalid certificates.

Recommendations: For OPC UA .NET Standard Stack version 1.4.363.107, consider disabling the establishment of secure connections using invalid certificates until a patch is available. Restrict access to the connection establishment module to minimize the risk of exploitation. Avoid using invalid certificates in the affected connection establishment process until the issue is resolved. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Certificate Validation

Weakness Enumeration

CWE-295

Related Identifiers

CVE-2020-29457

GHSA-MJWW-934M-H4JW

Affected Products

Opc Ua .Net Standard Stack

References · 10

• https://osv.dev/vulnerability/GHSA-mjww-934m-h4jw · Vendor Advisory
• https://opcfoundation.org/SecurityBulletins/OPC%20Foundation%20Security%20Bulletin%20CVE-2020-29457.pdf · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-29457 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2020-29457 · Security Note
• https://github.com/OPCFoundation/UA-.NETStandard · Note
• https://github.com/OPCFoundation/UA-.NETStandard/pull/1229/commits/d815cfb972bd668c1b6e461f6ff97519d6b26f25 · Note
• https://github.com/OPCFoundation/UA-.NETStandard/pull/1229 · Note
• https://t.me/cvenotify/10270 · Telegram Post
• https://nuget.org/packages/OPCFoundation.NetStandard.Opc.Ua · Note
• https://t.me/cibsecurity/23682 · Telegram Post