CVE-2000-0948 in GnoRPM
Summary
by MITRE
GnoRPM before 0.95 allows local users to modify arbitrary files via a symlink attack.
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Analysis
by VulDB Data Team • 06/25/2021
The vulnerability described in CVE-2000-0948 represents a classic symlink attack scenario affecting GnoRPM versions prior to 0.95. This issue arises from insufficient input validation and improper handling of symbolic links during file operations, creating a privilege escalation vector for local attackers. The flaw specifically manifests when GnoRPM processes package installations or updates, where it fails to properly verify the integrity of file paths before creating or modifying files. This vulnerability falls under the broader category of insecure temporary file creation and symbolic link manipulation techniques that have been documented in various security frameworks including CWE-377 and CWE-378. The attack requires local system access and leverages the principle of least privilege by allowing an attacker to bypass normal file access controls through manipulation of symbolic links.
The technical implementation of this vulnerability exploits the timing window between when GnoRPM creates a temporary file or directory and when it performs operations on that target. An attacker can create a symbolic link with a name that matches the expected temporary file path, and when GnoRPM attempts to write to that location, it inadvertently writes to the target file specified by the symbolic link. This technique is particularly dangerous because it can be used to modify system files, configuration files, or even setuid binaries, depending on the context in which the vulnerable software operates. The attack vector demonstrates a fundamental flaw in file system operation security where proper validation of file paths and target locations is not implemented. The vulnerability is categorized under ATT&CK technique T1068 which covers local privilege escalation through improper file permissions and symbolic link manipulation.
The operational impact of CVE-2000-0948 extends beyond simple file modification capabilities, as it can potentially allow attackers to escalate privileges or compromise system integrity. When GnoRPM is run with elevated privileges or in environments where it handles sensitive package installations, the ability to redirect file operations through symbolic links can lead to complete system compromise. The vulnerability affects systems where GnoRPM is used for package management, particularly in Unix-like environments where symbolic link attacks are a well-known threat vector. Organizations using older versions of GnoRPM face significant risk, especially in multi-user environments where local access can be gained through various attack vectors. The remediation process requires updating to GnoRPM version 0.95 or later, which implements proper symlink detection and validation mechanisms. Additionally, system administrators should implement proper file permissions, disable unnecessary symbolic link creation, and monitor for suspicious file access patterns. The vulnerability also highlights the importance of following secure coding practices and implementing proper input validation, as outlined in various security standards including those from the Open Web Application Security Project and NIST guidelines for secure software development.