CVE-2005-2311 in SMS
Summary
by MITRE
SMS 1.9.2m and earlier allows local users to overwrite arbitrary files via a symlink attack on the (1) request1 or (2) request2 temporary files.
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Analysis
by VulDB Data Team • 07/10/2018
The vulnerability identified as CVE-2005-2311 affects SMS 1.9.2m and earlier versions, presenting a significant security risk through improper temporary file handling mechanisms. This flaw enables local attackers to manipulate the system by creating symbolic links that target critical temporary files used during the application's operation. The vulnerability specifically impacts the request1 and request2 temporary files, which are utilized in the software's processing pipeline and represent critical points where unauthorized file manipulation can occur.
The technical exploitation of this vulnerability relies on the principle of symlink attacks, where an attacker creates symbolic links with the same names as the temporary files that the vulnerable application expects to create. When the application runs with elevated privileges and attempts to write to these temporary files, the system follows the symbolic link instead of creating the intended file, allowing the attacker to redirect file operations to arbitrary locations on the filesystem. This type of attack falls under the category of insecure temporary file creation practices and is closely related to CWE-377, which addresses insecure temporary file handling. The vulnerability demonstrates a classic race condition scenario where the timing between checking for file existence and creating the file provides an opportunity for malicious interference.
The operational impact of this vulnerability extends beyond simple file overwriting, as it can potentially lead to privilege escalation and system compromise when the vulnerable application operates with elevated privileges. Attackers can leverage this weakness to overwrite critical system files, configuration files, or even executable programs, depending on the permissions and context in which the vulnerable application runs. The attack vector requires local access to the system but can be particularly dangerous in multi-user environments where attackers might gain access through legitimate user accounts. This vulnerability is classified under the ATT&CK technique T1059.007 for command and scripting interpreter, as attackers may use the compromised temporary files to execute malicious code or establish persistent access.
Mitigation strategies for CVE-2005-2311 should focus on implementing secure temporary file creation practices that eliminate the window of opportunity for symlink attacks. System administrators should ensure that the vulnerable application is updated to a patched version that properly handles temporary file creation using secure methods such as creating files with unique names and appropriate permissions, or using atomic file creation techniques. The implementation of proper file access controls and privilege separation can significantly reduce the potential impact of such vulnerabilities. Additionally, regular security audits should verify that applications do not create temporary files in predictable locations and that proper file system permissions are enforced to prevent unauthorized file manipulation. Organizations should also consider implementing monitoring solutions to detect suspicious file creation patterns and symbolic link activities that may indicate exploitation attempts.