SOGo Trust Proxy Authentication Bypass

Executive Summary

This vulnerability exists in sogo_yhn software versions prior to 5.8.0~ynh9. It involves a configuration setting 'SOGoTrustProxyAuthentication=YES' which causes SOGo to bypass password checks during HTTP Basic authentication. An attacker can exploit this by providing a valid username and any arbitrary password to gain unauthorized access to that user's account without proper authentication.

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Detection Guidance

Check SOGo configuration files for the parameter SOGoTrustProxyAuthentication=YES. Inspect HTTP Basic authentication logs for successful logins with arbitrary passwords. Use network monitoring tools to detect unusual header manipulation attempts like x-webobjects-remote-user.

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Impact Analysis

An unauthenticated attacker could gain access to any user account including privileged accounts by supplying a valid username and any password. This could lead to unauthorized data access, modification, or exfiltration depending on the user's permissions. The impact includes potential loss of confidentiality, integrity, and availability of sensitive information stored in SOGo.

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Compliance Impact

This vulnerability could lead to unauthorized access to personal data, violating GDPR's data protection requirements and HIPAA's security rules for protected health information. Organizations may face compliance violations, regulatory fines, and reputational damage if this vulnerability is exploited to access sensitive data.

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Mitigation Strategies

Upgrade SOGo to version 5.8.0~ynh9 or later immediately. Disable HTTP Basic authentication if not required. Review and remove any custom configurations enabling SOGoTrustProxyAuthentication. Restrict network access to SOGo services until patched.

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