CVE-2001-1197 in KDEUtils
Summary
by MITRE
klprfax_filter in KDE2 KDEUtils allows local users to overwrite arbitrary files via a symlink attack on the klprfax.filter temporary file.
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Analysis
by VulDB Data Team • 06/04/2018
The vulnerability identified as CVE-2001-1197 resides within the klprfax_filter component of KDE2 KDEUtils, a desktop environment and set of applications for unix-like operating systems. This flaw represents a classic symlink attack scenario that enables local users to manipulate the file system by creating symbolic links that point to sensitive target files. The vulnerability specifically targets the temporary file named klprfax.filter which is utilized during the printing and faxing operations within the KDE desktop environment. The flaw occurs when the application fails to properly validate the existence and ownership of temporary files before writing to them, creating an opportunity for privilege escalation and unauthorized file manipulation.
The technical implementation of this vulnerability stems from improper handling of temporary file creation and management within the KDEUtils package. When klprfax_filter processes print or fax jobs, it creates temporary files in predictable locations without sufficient security checks to prevent symbolic link attacks. Local users can exploit this by creating symbolic links with the same names as the temporary files that the application expects to create, thereby redirecting the application's write operations to arbitrary locations on the file system. This type of vulnerability falls under the category of insecure temporary file handling as defined by CWE-377, where the creation of temporary files with predictable names and insufficient security measures creates opportunities for attackers to manipulate the application's behavior. The flaw also aligns with CWE-378, which specifically addresses the creation of temporary files with insecure permissions and predictable names.
The operational impact of this vulnerability extends beyond simple file overwriting, as it can potentially enable local users to modify critical system files, configuration data, or even files belonging to other users with higher privileges. An attacker could leverage this vulnerability to overwrite system binaries, configuration files, or sensitive data files, potentially leading to privilege escalation or system compromise. The attack requires local system access but does not necessitate network connectivity or special privileges beyond what a regular user would typically possess. This makes the vulnerability particularly concerning in multi-user environments where users may have legitimate access to the system but should not be able to modify critical system components. The vulnerability also demonstrates weaknesses in the application's security model and highlights the importance of proper input validation and file system access controls in desktop applications.
Mitigation strategies for CVE-2001-1197 should focus on implementing proper temporary file handling procedures that prevent symbolic link attacks. The most effective approach involves using secure temporary file creation methods that ensure files are created atomically and with appropriate permissions that prevent symbolic link manipulation. System administrators should update to patched versions of KDEUtils where the vulnerability has been addressed through improved temporary file handling mechanisms. The fix typically involves using system calls that create temporary files with unique names and verify that the files are not symbolic links before proceeding with write operations. Additionally, the principle of least privilege should be enforced by ensuring that applications running with elevated privileges do not perform unnecessary file operations that could be exploited. This vulnerability also underscores the importance of secure coding practices and the need for regular security audits of desktop applications, particularly those that handle user input or perform system-level operations. Organizations should implement monitoring for suspicious file system activities and ensure that all desktop environments and applications are kept up to date with security patches. The vulnerability serves as a reminder of the persistent challenges in securing desktop environments and the importance of addressing security concerns at multiple layers of the system architecture.