CVE-2003-1081 in Solaris
Summary
by MITRE
Aspppls for Solaris 8 allows local users to overwrite arbitrary files via a symlink attack on the .asppp.fifo temporary file.
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Analysis
by VulDB Data Team • 01/22/2025
The vulnerability described in CVE-2003-1081 affects Aspppls for Solaris 8, a web application that processes.asp files through a temporary file mechanism. This flaw represents a classic symlink attack scenario where local users can exploit improper file handling to overwrite arbitrary files on the system. The vulnerability stems from the application's failure to properly validate or secure temporary file creation processes, specifically concerning the .asppp.fifo temporary file that is used during the processing of.asp files. When the application creates this temporary file, it does not adequately verify the file's existence or ownership before proceeding with file operations, creating an opportunity for malicious users to manipulate the file system through symbolic links.
The technical exploitation of this vulnerability involves creating a symbolic link with the name .asppp.fifo that points to a target file the attacker wishes to overwrite or modify. When the vulnerable application attempts to create or access the temporary file, it follows the symbolic link and operates on the target file instead of the intended temporary location. This type of attack falls under the category of time-of-check to time-of-use vulnerabilities, where the application checks for file existence or permissions at one point in time but performs operations on the file at a later point when the file system state may have changed. The flaw is particularly dangerous because it allows local users to potentially overwrite critical system files, configuration files, or even files owned by other users, depending on the application's execution context and permissions.
The operational impact of this vulnerability extends beyond simple file overwriting, as it can enable privilege escalation and persistent access to systems. Attackers can leverage this vulnerability to overwrite system binaries, configuration files, or log files, potentially leading to complete system compromise. The attack requires local system access but does not require network connectivity, making it particularly insidious as it can be exploited by users who already have limited access to the system. This vulnerability also demonstrates poor secure coding practices, particularly around temporary file creation and handling, which aligns with CWE-377: Insecure Temporary File and CWE-378: Poor File Permissions. The vulnerability can be exploited to gain unauthorized access to system resources and potentially establish persistent backdoors through the modification of system files or configuration settings.
Mitigation strategies for this vulnerability must address the root cause of improper temporary file handling. The most effective approach involves implementing proper file validation and secure temporary file creation mechanisms that prevent symbolic link manipulation. Systems administrators should ensure that applications create temporary files with unique names and proper permissions, and that they verify file ownership and existence before operating on temporary files. This vulnerability also highlights the importance of the principle of least privilege and proper file system permissions. Additionally, implementing proper input validation and secure coding practices can prevent similar issues in other applications. Organizations should conduct regular security audits of their applications to identify and remediate similar temporary file handling vulnerabilities. The use of sandboxing techniques and mandatory access controls can further reduce the potential impact of such vulnerabilities by limiting the scope of file operations that applications can perform. This vulnerability also demonstrates the necessity of following secure coding guidelines and implementing proper file system security measures as outlined in various security frameworks and standards.