Myriad <= 2.0 - Arbitrary File Deletion
Strategic Overview
- Status
- Patched in 2.1
- Affected Theme
- Myriad
- Affected Version
<= 2.0- CVSS
- 7.5High
- Weakness type
- CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CVE
CVE pending
At a glance
This record tracks a high-severity Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the Myriad WordPress theme, affecting versions <= 2.0. It carries a CVSS score of 7.5 (reachable over the network; low attack complexity; high availability impact). Exploitation requires no authentication. The issue is fixed in version 2.1; sites on affected versions should update now. Disclosed December 2013, reported by Interference Security.
Vulnerability Overview
The Myriad Theme for WordPress is vulnerable to Arbitrary File Deletion in versions up to, and including, 2.1. This is due to the '_mysite_delete_skin_zip' parameter in the 'dl-skin.php' file. This makes it possible for unauthenticated attackers to delete any file on the server of the vulnerable service.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no privileges on the target site, and no interaction from a victim user. A successful exploit has high impact on availability.
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Myriad <= 2.0 carries this weakness at _mysite_delete_skin_zip, and reaching it takes a caller who can reach the endpoint. Path traversal happens when user-controlled text is used to build a filesystem path without being constrained to an intended directory, so sequences like ../ walk the resolved path somewhere else.
Depending on the operation, it means reading files outside the intended folder — wp-config.php being the usual target — or writing to and deleting paths the web server can touch. For Myriad the fix is 2.1: builds <= 2.0 are affected, anything from 2.1 onward is not.
Remediation
Update to version 2.1, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Myriad: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Myriad 2.1 closes this, and updating the theme is the step that ends it.
- Firewall
- Alerts
External References
Related records
Same weakness class
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