CVE-2001-0132 in Interscan Viruswall
Summary
by MITRE
Interscan VirusWall 3.6.x and earlier follows symbolic links when uninstalling the product, which allows local users to overwrite arbitrary files via a symlink attack.
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Analysis
by VulDB Data Team • 05/26/2019
The vulnerability identified as CVE-2001-0132 affects Interscan VirusWall versions 3.6.x and earlier, presenting a critical security flaw in the uninstallation process that enables local users to exploit symbolic link handling. This issue stems from the software's failure to properly validate file paths during uninstallation, creating a pathway for malicious file overwrites through carefully crafted symbolic link attacks. The vulnerability exists within the uninstallation utility's directory traversal logic, which processes symbolic links without adequate sanitization or validation mechanisms.
The technical implementation of this vulnerability involves the uninstaller's improper handling of symbolic links within the file system hierarchy. When the uninstallation process encounters a symbolic link, it follows the link and attempts to remove or modify the target file, rather than recognizing the link as a potential security risk. This behavior creates a privilege escalation scenario where local users can manipulate the uninstallation process to overwrite files in arbitrary locations, potentially including system-critical files or other users' data. The flaw operates at the file system level, exploiting the fundamental trust placed in the uninstallation utility to properly handle file operations without considering the implications of symbolic link resolution.
The operational impact of this vulnerability extends beyond simple file overwrites, as it provides attackers with a method to compromise system integrity and potentially escalate privileges. Local users can leverage this vulnerability to modify critical system files, install malicious software, or disrupt normal system operations by replacing legitimate executables with malicious counterparts. The attack vector requires local system access but does not require elevated privileges, making it particularly dangerous in multi-user environments where users may have limited access but can still exploit this weakness. The vulnerability also aligns with attack techniques documented in the attack pattern taxonomy, specifically relating to privilege escalation through file system manipulation and local exploitation methods.
Security mitigations for this vulnerability should focus on implementing proper symbolic link validation during uninstallation processes, which aligns with the principles outlined in the CWE (Common Weakness Enumeration) category for improper handling of symbolic links. System administrators should immediately upgrade to patched versions of Interscan VirusWall, as the vulnerability affects the core uninstallation functionality of the software. Additional protective measures include implementing file system permissions that prevent unauthorized users from manipulating installation directories, conducting regular security audits of installed software packages, and employing automated tools to detect and remediate symbolic link vulnerabilities in legacy systems. The remediation approach should follow industry best practices for software security, including proper input validation and secure coding practices that prevent path traversal attacks and symbolic link manipulation. Organizations should also consider implementing the principle of least privilege to limit local user access to system-critical directories and processes.