CVE-2001-0623 in Simple Asynchronous File Transfer
Summary
by MITRE
sendfiled, as included with Simple Asynchronous File Transfer (SAFT), on various Linux systems does not properly drop privileges when sending notification emails, which allows local attackers to gain privileges.
Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.
Analysis
by VulDB Data Team • 10/05/2025
The vulnerability identified as CVE-2001-0623 resides within the sendfiled utility that is part of the Simple Asynchronous File Transfer (SAFT) software suite. This flaw manifests in the privilege management mechanism during email notification processing, creating a critical security weakness that can be exploited by local attackers to escalate their system privileges. The vulnerability specifically affects various Linux distributions where SAFT is installed, making it a widespread concern for system administrators managing multiple affected systems.
The technical root cause of this vulnerability stems from improper privilege dropping mechanisms within the sendfiled daemon. When the utility processes file transfers and needs to send email notifications, it fails to correctly relinquish elevated privileges that it may have acquired during its operation. This privilege escalation occurs because the code does not properly implement the standard Unix privilege management practices that require dropping root privileges after performing privileged operations. According to CWE-250, this represents a direct violation of the principle of least privilege, where unnecessary elevated permissions are maintained longer than required. The flaw essentially creates a privilege escalation vector where local users can exploit the improper privilege handling to gain higher system access levels.
The operational impact of this vulnerability is significant for any system running the affected SAFT software. Local attackers who already have access to the system can leverage this weakness to execute arbitrary code with elevated privileges, potentially leading to complete system compromise. This type of vulnerability is particularly dangerous because it does not require network access or remote exploitation capabilities, making it an attractive target for attackers who have already gained initial access through other means. The vulnerability aligns with ATT&CK technique T1068 which describes the use of privilege escalation techniques to gain higher system access levels, and specifically relates to T1548.1 which covers abuse of privilege escalation mechanisms.
Mitigation strategies for this vulnerability should focus on immediate patching of the affected SAFT software to ensure proper privilege management is implemented. System administrators should verify that the sendfiled utility properly drops privileges before sending email notifications and that all code paths correctly implement the standard privilege management procedures. The recommended approach involves updating to patched versions of SAFT, implementing proper privilege separation mechanisms, and conducting thorough security reviews of all daemon processes that may handle privileged operations. Organizations should also consider implementing monitoring for unusual privilege escalation activities and ensure that the principle of least privilege is maintained across all system components. Additionally, regular security auditing of privilege management code paths should be conducted to prevent similar issues from emerging in other software components.