CVE-2001-1173 in Masqmail
Summary
by MITRE
Vulnerability in MasqMail before 0.1.15 allows local users to gain privileges via piped aliases.
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Analysis
by VulDB Data Team • 05/31/2018
The vulnerability described in CVE-2001-1173 represents a privilege escalation issue within MasqMail, a mail transfer agent software that was widely used in the early 2000s for handling email routing and delivery. This particular flaw existed in versions prior to 0.1.15 and specifically targeted local users who could exploit a weakness in how the system handled piped aliases. The vulnerability falls under the category of local privilege escalation as it allows attackers with local system access to elevate their privileges to higher levels within the system. This type of vulnerability is particularly concerning because it can be exploited by users who already have some level of access to the system but lack administrative privileges.
The technical flaw manifests through the improper handling of piped aliases within MasqMail's configuration. When an email is sent to an alias that is configured to pipe the message to an external command or script, the system fails to properly validate or sanitize the input before executing the command. This creates an opportunity for local users to craft malicious piped alias configurations that can execute arbitrary commands with elevated privileges. The vulnerability is directly related to CWE-78, which describes improper neutralization of special elements used in OS commands, and CWE-22, which addresses improper limitation of a pathname to a restricted directory. These weaknesses allow attackers to manipulate command execution paths and potentially bypass security controls that are meant to restrict user access to system resources.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with a potential foothold for further system compromise. Once local users can execute commands with elevated privileges, they can access sensitive system files, modify configurations, install backdoors, or conduct reconnaissance activities that would otherwise be restricted. The attack vector specifically targets the mail system's alias configuration mechanism, which often runs with elevated privileges to ensure proper mail delivery. This makes the vulnerability particularly dangerous in multi-user environments where multiple users may have local access to the system. The exploitation of this flaw can lead to complete system compromise, especially when combined with other vulnerabilities or when the system is configured with weak access controls.
Mitigation strategies for CVE-2001-1173 should focus on upgrading to MasqMail version 0.1.15 or later, which contains the necessary patches to address the privilege escalation issue. System administrators should also implement proper input validation and sanitization for all piped alias configurations, ensuring that external commands are properly escaped and validated before execution. Additional protective measures include restricting local user access to mail configuration files, implementing proper access controls on system resources, and monitoring for suspicious command execution patterns. Organizations should also consider implementing the principle of least privilege, ensuring that mail delivery processes run with minimal required permissions. From an ATT&CK framework perspective, this vulnerability maps to T1068, which covers 'Exploitation for Privilege Escalation', and T1548.003, which addresses 'Abuse of Functionality'. Regular security assessments and vulnerability scanning should be conducted to identify and remediate similar issues in other mail systems and applications that may be susceptible to command injection attacks.