SYSTEM code execution via malicious OpenVPN configuration
Published Aug 2, 2021 · Updated Sep 17, 2024
Privilege escalation in MB connect line mbDIALUP 3.9R0.0 and earlier allows local users to execute arbitrary code as SYSTEM. The mbConnect24serv service accepts a low-privileged caller's command and starts OpenVPN with an attacker-controlled configuration containing script directives. Local low-privileged access is required; successful exploitation runs the configuration's commands with the service's NT AUTHORITY\SYSTEM privileges.
Summary
What happened
Privilege escalation in MB connect line mbDIALUP 3.9R0.0 and earlier allows local users to execute arbitrary code as SYSTEM. The mbConnect24serv service accepts a low-privileged caller's command and starts OpenVPN with an attacker-controlled configuration containing script directives. Local low-privileged access is required; successful exploitation runs the configuration's commands with the service's NT AUTHORITY\SYSTEM privileges.
The record
- CVE
- CVE-2021-33526
- Published
- Aug 2, 2021
- Updated
- Sep 17, 2024
- Vendor
- MB connect line
- Product
- mbDIALUP
- Classifications
- CWE-269, T1068
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Aug 2, 2021CVE publishedPublication date reported by the CVE source.
- Sep 17, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=3.9R0.0 <=3.9R0.0
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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