Smush – Lazy Load Images, Optimize & Compress Images <= 2.7.5 - Directory Traversal
Strategic Overview
- Status
- Patched in 2.7.6
- Affected Version
<= 2.7.5- CVSS
- 5.3Medium
- Weakness type
- CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
- CVE
CVE-2017-15079
At a glance
CVE-2017-15079 is a medium-severity Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') vulnerability in the Smush WordPress plugin, affecting versions <= 2.7.5. It carries a CVSS score of 5.3 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 2.7.6; sites on affected versions should update now. Disclosed September 2017, reported by Ricardo Sanchez.
Vulnerability Overview
The Smush Image Compression and Optimization plugin before 2.7.6 for WordPress allows directory traversal.
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.
CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
Reaching this weakness in Smush <= 2.7.5 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 Smush the fix is 2.7.6: builds <= 2.7.5 are affected, anything from 2.7.6 onward is not.
Remediation
Update to version 2.7.6, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Smush: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Smush 2.7.6 closes this, and updating the plugin is the step that ends it.
- Firewall
- Alerts
External References
Related records
Other vulnerabilities in Smush – Image Optimization, Compression, Lazy Load, WebP & CDN
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