CVE-2007-0237 in Lookup
Summary
by MITRE
The ndeb-binary feature in Lookup (lookup-el) allows local users to overwrite arbitrary files via a symlink attack on temporary files.
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Analysis
by VulDB Data Team • 07/17/2019
The vulnerability identified as CVE-2007-0237 resides within the ndeb-binary feature of the lookup-el package, presenting a significant security risk to systems that utilize this functionality. This flaw specifically affects local users who can exploit a symlink attack mechanism to overwrite arbitrary files on the system. The vulnerability stems from inadequate handling of temporary files during the lookup process, creating an environment where malicious users can manipulate file operations through symbolic link manipulation. The affected component operates as part of a broader lookup system that processes various data inputs, making it a potential vector for privilege escalation and data integrity compromise.
The technical implementation of this vulnerability involves the creation of temporary files with predictable names that can be manipulated through symbolic link attacks. When the ndeb-binary feature processes lookup requests, it generates temporary files in directories accessible to local users. Attackers can create symbolic links with the same names as these temporary files before the legitimate process creates them, effectively redirecting file operations to arbitrary locations. This type of attack falls under the category of time-of-check to time-of-use vulnerabilities, where the system checks for file existence and then uses the file in a subsequent operation, creating a window for exploitation. The flaw demonstrates poor security practices in temporary file creation and access control mechanisms, violating fundamental principles of secure coding and system design.
The operational impact of this vulnerability extends beyond simple file overwrites, potentially allowing for privilege escalation attacks and persistent system compromise. Local users who exploit this vulnerability can overwrite critical system files, configuration files, or even binary executables with malicious content, leading to unauthorized code execution or system instability. The attack requires minimal privileges since it targets local user capabilities, making it particularly dangerous in multi-user environments where users may have access to sensitive system resources. This vulnerability represents a classic case of inadequate input validation and improper file handling, where the system fails to properly validate the integrity of temporary files before operation. The implications are particularly severe in enterprise environments where lookup systems process sensitive data and where local privilege escalation can lead to broader system compromise.
Mitigation strategies for CVE-2007-0237 should focus on implementing secure temporary file creation practices and eliminating the conditions that enable symlink attacks. Organizations should ensure that temporary files are created with unique, unpredictable names and are owned by the appropriate user or system account. The use of atomic file creation operations and proper file permission controls can prevent unauthorized access to temporary files during processing. System administrators should consider implementing access controls and monitoring for suspicious file creation patterns, particularly in directories where lookup processes operate. This vulnerability aligns with CWE-377, which addresses insecure temporary file handling, and demonstrates patterns commonly exploited in privilege escalation attacks as outlined in ATT&CK technique T1068. Regular security audits and proper patch management are essential to prevent exploitation, as this vulnerability has been known for many years and should have been addressed through proper security updates. The remediation process involves updating the lookup-el package to versions that implement secure temporary file handling mechanisms and conducting thorough security reviews of similar components within the system.