CVE-2011-3350 in masqmail
Summary
by MITRE
masqmail 0.2.21 through 0.2.30 improperly calls seteuid() in src/log.c and src/masqmail.c that results in improper privilege dropping.
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Analysis
by VulDB Data Team • 02/23/2024
The vulnerability identified as CVE-2011-3350 affects masqmail versions 0.2.21 through 0.2.30 and represents a critical privilege escalation issue stemming from improper privilege management during program execution. This flaw manifests in the source code files log.c and masqmail.c where the seteuid() system call is invoked incorrectly, leading to inadequate privilege dropping mechanisms that can be exploited by malicious actors. The issue falls under the category of improper privilege management as defined by CWE-276, which specifically addresses incorrect permissions and access control in software applications.
The technical implementation of this vulnerability occurs when masqmail attempts to drop elevated privileges after performing operations that require root access. The improper calling sequence of seteuid() means that the program fails to correctly transition from a privileged state back to a non-privileged state, leaving processes running with elevated permissions longer than necessary. This behavior creates a persistent security risk where malicious users could potentially exploit the extended privilege period to perform unauthorized actions. The flaw represents a direct violation of the principle of least privilege and can be categorized under ATT&CK technique T1068 which covers privilege escalation through improper privilege management.
The operational impact of this vulnerability extends beyond simple privilege escalation as it can enable attackers to gain unauthorized access to system resources, modify configuration files, or even execute arbitrary code with elevated privileges. When masqmail runs with elevated privileges for extended periods, it creates an attack surface that can be leveraged by threat actors to compromise the entire system. The vulnerability is particularly concerning because masqmail typically operates as a mail transfer agent and may have access to sensitive system resources or network interfaces during its operation. This exposure can lead to data breaches, system compromise, or denial of service conditions that affect the overall security posture of affected systems.
Mitigation strategies for this vulnerability require immediate patching of affected masqmail installations to versions that properly implement privilege dropping mechanisms. System administrators should ensure that all instances of masqmail are updated to versions that correctly handle seteuid() calls in the affected source files. Additionally, implementing proper privilege separation through the use of dedicated service accounts with minimal required permissions can help reduce the impact if the vulnerability is exploited. Network segmentation and monitoring of mail services can also provide additional layers of defense. The remediation process should include thorough testing of updated installations to ensure that privilege management works correctly and that no regressions have been introduced in the mail handling functionality. Organizations should also consider implementing automated patch management systems to prevent similar vulnerabilities from remaining unaddressed in the future.