PT-2021-4937 · Openvpn+1 · Openvpn+1

Noam Moshe · Published 2021-07-22 · Updated 2021-11-23 · CVE-2021-33526

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

Name of the Vulnerable Software and Affected Versions MB connect line mbDIALUP versions <= 3.9R0.0

Description The issue is related to insufficient access control in the mbConnect24serv component, allowing a low-privileged local attacker to send a command to the service running with NT AUTHORITYSYSTEM privileges. This can lead to the execution of a malicious OpenVPN configuration, resulting in arbitrary code execution with the privileges of the service.

Recommendations For MB connect line mbDIALUP versions <= 3.9R0.0, consider restricting access to the service running with NT AUTHORITYSYSTEM privileges until a patch is available. As a temporary workaround, avoid using malicious OpenVPN configurations and restrict the execution of arbitrary code with the privileges of the service. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Improper Privilege Management

Weakness Enumeration

CWE-269

Related Identifiers

BDU:2021-05683

CVE-2021-33526

Affected Products

Openvpn

Mbdialup

References · 6

• https://nvd.nist.gov/vuln/detail/CVE-2021-33526 · Security Note
• https://bdu.fstec.ru/vul/2021-05683 · Security Note
• https://osv.dev/vulnerability/CVE-2021-33526 · Vendor Advisory
• https://t.me/cibsecurity/26661 · Telegram Post
• https://cert.vde.com/de-de/advisories/vde-2021-017 · Note
• https://t.me/true_secator/2362 · Telegram Post