Authenticated information disclosure via deferred-auth channel response
Published Jun 4, 2021 · Updated Aug 4, 2024
Authentication bypass in OpenVPN Access Server 2.8.7 and earlier allows remote authenticated users to access control-channel data via deferred authentication. The deferred-authentication handling returns channel data before access control completes, which can expose client-side scripts and other configuration information. Exploitation requires a valid locked or auto-login profile or credentials; the documented consequence is information disclosure and possible protected-network access, not arbitrary code execution.
Summary
What happened
Authentication bypass in OpenVPN Access Server 2.8.7 and earlier allows remote authenticated users to access control-channel data via deferred authentication. The deferred-authentication handling returns channel data before access control completes, which can expose client-side scripts and other configuration information. Exploitation requires a valid locked or auto-login profile or credentials; the documented consequence is information disclosure and possible protected-network access, not arbitrary code execution.
The record
- CVE
- CVE-2020-15077
- Published
- Jun 4, 2021
- Updated
- Aug 4, 2024
- Vendor
- OpenVPN Inc.
- Product
- OpenVPN Access Server
- Classifications
- CWE-287, CWE-305, T1078
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 4, 2021CVE publishedPublication date reported by the CVE source.
- Aug 4, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=2.8.7 and earlier versions
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
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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