CVE-2022-0855 in whmcs_plugin
Summary
by MITRE • 03/04/2022
Improper Resolution of Path Equivalence in GitHub repository microweber-dev/whmcs_plugin prior to 0.0.4.
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Analysis
by VulDB Data Team • 03/09/2022
The vulnerability identified as CVE-2022-0855 represents a critical path equivalence resolution flaw within the WHMCS plugin developed by microweber-dev. This issue affects versions prior to 0.0.4 and stems from inadequate handling of file path normalization and equivalence checking mechanisms. The vulnerability resides in the plugin's inability to properly resolve equivalent file paths that may appear different but ultimately reference the same location within the filesystem. Such path equivalence issues commonly arise when plugins fail to canonicalize paths or properly normalize directory separators, allowing attackers to exploit discrepancies in path resolution logic.
The technical implementation of this vulnerability manifests when the plugin processes user-supplied file paths or configuration parameters without proper validation and normalization. Attackers can leverage this weakness by crafting malicious paths that appear legitimate but exploit path equivalence to access restricted files or directories. The flaw specifically impacts how the plugin resolves relative paths, symbolic links, and directory traversal sequences that should be treated as equivalent but are not properly normalized. This misconfiguration creates opportunities for privilege escalation, unauthorized file access, and potential code execution depending on the plugin's functionality and the underlying system permissions.
The operational impact of CVE-2022-0855 extends beyond simple path resolution issues as it can enable attackers to bypass security controls designed to restrict file access. When the plugin handles file operations, directory listings, or configuration management, the improper path resolution can allow adversaries to access sensitive data, modify critical files, or escalate privileges within the WHMCS environment. The vulnerability particularly affects systems where the plugin interfaces with filesystem operations, as attackers can exploit the path equivalence resolution to traverse directories they should not have access to. This weakness can be especially dangerous in shared hosting environments or multi-tenant systems where proper access controls are essential for maintaining security boundaries.
Security mitigations for this vulnerability require immediate patching to version 0.0.4 or later, which implements proper path normalization and canonicalization functions. Organizations should also implement comprehensive input validation for all file path parameters and ensure that path equivalence checking is performed using standardized library functions rather than custom implementations. The remediation process should include thorough code review of path handling logic and implementation of proper path normalization using established security libraries. Additionally, system administrators should monitor for any unauthorized file access patterns or unexpected directory traversals that might indicate exploitation attempts. This vulnerability aligns with CWE-367, which addresses time-of-check to time-of-use (TOCTOU) race conditions, and may map to ATT&CK technique T1059 for execution through command injection or file manipulation. The fix should incorporate proper file system access control checks and ensure that all path operations are validated against a canonical representation to prevent attackers from exploiting path equivalence discrepancies.