Directory Traversal in Exim Mail Server

Executive Summary

Exim before version 4.99.5 has a directory traversal vulnerability where arguments related to queue-name are mishandled. This allows attackers with command-line access to access files outside the spool area, potentially leading to privilege escalation.

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Detection Guidance

To detect this vulnerability, check the Exim version installed on your system. Run: exim --version. If the version is below 4.99.5, the system is vulnerable. Additionally, monitor for unusual file access patterns or privilege escalation attempts in logs.

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Impact Analysis

An attacker could exploit this to access sensitive files outside the intended directory, gain elevated privileges, and execute arbitrary commands on the system. This could lead to full system compromise depending on the configuration.

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Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, violating confidentiality requirements in GDPR and HIPAA. Organizations may face compliance violations, legal penalties, and reputational damage if exploited.

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Mitigation Strategies

Immediately upgrade Exim to version 4.99.5 or later. If upgrading is not possible, restrict command-line access to Exim and review .forward file configurations to prevent privilege escalation.

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