PhastPress <= 3.7 - Unauthenticated Arbitrary File Read via Null Byte Injection
Strategic Overview
Vulnerability Overview
The PhastPress plugin for WordPress is vulnerable to Unauthenticated Arbitrary File Read via null byte injection in all versions up to, and including, 3.7. This is due to a discrepancy between the extension validation in `getExtensionForURL()` which operates on URL-decoded paths, and `appendNormalized()` which strips everything after a null byte before constructing the filesystem path. This makes it possible for unauthenticated attackers to read arbitrary files from the webroot, including wp-config.php, by appending a double URL-encoded null byte (%2500) followed by an allowed extension (.txt) to the file path.
Technical Analysis
REMEDIATION: Update to version 3.8, or a newer patched version --- IDENTIFIER: CWE-158 (Improper Neutralization of Null Byte or NUL Character) The product receives input from an upstream component, but it does not neutralize or incorrectly neutralizes NUL characters or null bytes when they are sent to a downstream component.
External References
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