CVE-2003-0606 in sup
Summary
by MITRE
sup 1.8 and earlier does not properly create temporary files, which allows local users to overwrite arbitrary files.
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Analysis
by VulDB Data Team • 06/29/2021
The vulnerability described in CVE-2003-0606 affects sup version 1.8 and earlier, representing a critical security flaw in temporary file handling mechanisms. This issue stems from improper temporary file creation practices that create opportunities for local privilege escalation and arbitrary file overwrite attacks. The flaw exists within the software's design where temporary files are not adequately secured or isolated during their creation process, leaving them susceptible to manipulation by malicious local users.
The technical implementation of this vulnerability falls under CWE-377, which addresses insecure temporary file creation practices. When sup creates temporary files, it fails to employ proper security measures such as using secure file creation functions, setting appropriate file permissions, or ensuring atomic creation processes. This weakness allows attackers to predict temporary file names or manipulate the file creation sequence to substitute legitimate temporary files with malicious ones, effectively enabling arbitrary file overwrite operations. The vulnerability is particularly dangerous because it operates at the local user level, meaning that any user with access to the system can exploit this flaw to overwrite files with potentially elevated privileges.
The operational impact of this vulnerability extends beyond simple file corruption, as it can enable attackers to modify critical system files, configuration data, or even executable programs. Local users who exploit this vulnerability can potentially gain elevated privileges by overwriting files that are subsequently executed with higher permissions, creating a pathway for privilege escalation attacks. This flaw particularly affects systems where sup is used for file management or system maintenance tasks, as these operations often involve temporary file creation. The vulnerability can be exploited in various attack scenarios including privilege escalation, data integrity compromise, and system stability degradation.
Mitigation strategies for this vulnerability should focus on implementing secure temporary file handling practices that align with industry standards and security best practices. System administrators should immediately upgrade to sup versions that address this specific temporary file creation flaw, as the vulnerability has been resolved in subsequent releases. The implementation of proper file permission controls, secure temporary file creation functions, and atomic file operations should be enforced throughout the system. Additionally, regular security audits should verify that temporary file handling mechanisms follow secure coding practices and that file permissions are properly configured to prevent unauthorized access or modification. Organizations should also consider implementing monitoring solutions to detect suspicious temporary file creation patterns and potential exploitation attempts. This vulnerability demonstrates the critical importance of proper temporary file management in preventing local privilege escalation attacks and maintaining overall system security posture.