CVE-2008-5303 in File::Path
Summary
by MITRE
Race condition in the rmtree function in File::Path 1.08 (lib/File/Path.pm) in Perl 5.8.8 allows local users to allows local users to delete arbitrary files via a symlink attack, a different vulnerability than CVE-2005-0448, CVE-2004-0452, and CVE-2008-2827. NOTE: this is a regression error related to CVE-2005-0448. It is different from CVE-2008-5302 due to affected versions.
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Analysis
by VulDB Data Team • 08/03/2021
The vulnerability described in CVE-2008-5303 represents a critical race condition within the rmtree function of Perl's File::Path module version 1.08, specifically affecting Perl 5.8.8 installations. This flaw creates a security weakness that enables local attackers to exploit symbolic link manipulation techniques to delete files outside of their intended scope. The vulnerability operates through a timing window where the system's file operations can be manipulated between the time when permissions are checked and when actual file operations are executed, creating an opportunity for malicious exploitation.
The technical implementation of this race condition occurs within the File::Path module's rmtree function, which is responsible for recursively removing directory trees. When processing directories that contain symbolic links, the function performs a series of checks and operations that are not atomic. An attacker can exploit this by creating a carefully timed sequence of symbolic link creation and file deletion operations, allowing them to bypass normal file system permission checks and delete files that would otherwise be protected. This vulnerability is particularly dangerous because it leverages the inherent timing gaps in file system operations, making it difficult to detect and prevent through traditional security measures.
The operational impact of this vulnerability extends beyond simple file deletion capabilities, as it can be used to compromise system integrity and potentially escalate privileges. Attackers can leverage this race condition to remove critical system files, configuration data, or files owned by other users, potentially leading to system instability or complete system compromise. The vulnerability affects systems where Perl 5.8.8 with File::Path 1.08 is installed and where local users have the ability to create symbolic links in directories that may be processed by applications using the vulnerable rmtree function. This makes it particularly concerning in multi-user environments where proper privilege separation is essential for system security.
This vulnerability is classified as a race condition under CWE-362 and represents a regression from the previously patched CVE-2005-0448, indicating that a fix for similar issues was not properly maintained or updated. The distinction from CVE-2008-5302 highlights that this is a specific version-related issue affecting Perl 5.8.8 rather than other affected versions. The ATT&CK framework categorizes this vulnerability under privilege escalation and defense evasion techniques, as it allows attackers to bypass normal file system protections through manipulation of symbolic link behavior. Organizations should implement immediate mitigations including upgrading to patched versions of Perl and File::Path, implementing proper file system permissions, and monitoring for suspicious symbolic link creation activities in system directories that may be processed by vulnerable applications.
The root cause of this vulnerability stems from improper handling of symbolic links in the file removal process, where the system does not maintain consistent state checks throughout the operation. This creates a window where an attacker can manipulate the file system environment between the time when access permissions are verified and when actual file operations are performed. The vulnerability demonstrates the importance of atomic operations in security-critical functions and highlights the need for proper synchronization mechanisms when dealing with file system operations that may be subject to concurrent access or manipulation by untrusted users. System administrators should prioritize patching this vulnerability and consider implementing additional security controls such as SELinux policies or mandatory access controls to prevent exploitation of similar timing-based vulnerabilities in other system components.