CVE-2001-1433 in httpd
Summary
by MITRE
Cherokee web server before 0.2.7 does not properly drop root privileges after binding to port 80, which could allow remote attackers to gain privileges via other vulnerabilities.
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Analysis
by VulDB Data Team • 09/25/2025
The Cherokee web server vulnerability CVE-2001-1433 represents a critical privilege escalation flaw that emerged in versions prior to 0.2.7. This vulnerability stems from improper privilege management during the server initialization process where the web server fails to correctly relinquish root privileges after successfully binding to the well-known port 80. The fundamental issue lies in the server's failure to execute the necessary privilege dropping mechanism that should occur after the initial port binding operation, leaving the process running with elevated privileges longer than necessary.
The technical implementation of this vulnerability involves the web server's process management model where it initially starts with root privileges to bind to port 80, which requires elevated permissions due to its status as a privileged port. However, the server's code does not properly implement the standard privilege dropping procedure that typically involves switching from root user to a non-privileged user account such as 'nobody' or 'www-data' after the port binding is complete. This design flaw creates a window of opportunity where the server continues to operate with root privileges, exposing the system to potential exploitation through other vulnerabilities present in the web server's functionality.
From an operational perspective, this vulnerability presents a significant risk to system security as it allows remote attackers to leverage the persistent root privileges for privilege escalation attacks. The vulnerability creates a dangerous state where an attacker who successfully exploits another vulnerability within the web server could potentially gain root access to the underlying operating system. This scenario violates the principle of least privilege and creates a persistent threat vector that could enable full system compromise. The vulnerability is particularly concerning because it affects the core server functionality rather than being an isolated component issue, making it more difficult to isolate and remediate.
The impact of this vulnerability aligns with CWE-272, which addresses the weakness of least privilege, and represents a classic example of improper privilege management in network services. According to ATT&CK framework, this vulnerability maps to T1068 - Exploitation for Privilege Escalation, where an adversary leverages a system's improper privilege management to elevate their access level. The vulnerability also connects to T1078 - Valid Accounts, as it essentially provides an attacker with a legitimate means to maintain elevated access through the web server process. The security implications extend beyond immediate privilege escalation as this flaw could enable attackers to install persistent backdoors, modify system files, or access sensitive data that would otherwise be protected by proper privilege boundaries.
Mitigation strategies for CVE-2001-1433 require immediate patching of the Cherokee web server to version 0.2.7 or later, which contains the necessary privilege dropping implementation. Organizations should also implement proper privilege separation practices by ensuring that web servers always drop root privileges immediately after port binding operations. Network segmentation and firewall rules should be implemented to limit access to port 80 and reduce the attack surface. Additionally, system monitoring should be enhanced to detect anomalous privilege usage patterns and unauthorized access attempts. The vulnerability highlights the critical importance of following secure coding practices for privilege management and demonstrates the necessity of thorough security testing for network services that require elevated privileges during initialization.