YITH WooCommerce Gift Cards Premium <= 3.3.0 - Arbitrary File Upload
Strategic Overview
- Status
- Patched in 3.3.1
- Affected Plugin
- YITH WooCommerce Gift Cards Premium
- Affected Version
< 3.3.1- CVSS
- 9.8Critical
- Weakness type
- CWE-434 · Unrestricted Upload of File with Dangerous Type
- CVE
CVE-2021-3120
At a glance
CVE-2021-3120 is a critical-severity Unrestricted Upload of File with Dangerous Type vulnerability in the YITH WooCommerce Gift Cards Premium WordPress plugin, affecting versions < 3.3.1. It carries a CVSS score of 9.8 (reachable over the network; low attack complexity; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 3.3.1; sites on affected versions should update now. Disclosed January 2021.
Vulnerability Overview
An arbitrary file upload vulnerability in the YITH WooCommerce Gift Cards Premium plugin before 3.3.1 for WordPress allows remote attackers to achieve remote code execution on the operating system in the security context of the web server. In order to exploit this vulnerability, an attacker must be able to place a valid Gift Card product into the shopping cart. An uploaded file is placed at a predetermined path on the web server with a user-specified filename and extension. This occurs because the ywgc-upload-picture parameter can have a .php value even though the intention was to only allow uploads of Gift Card images.
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 confidentiality, integrity, availability — full site compromise territory.
CWE-434: Unrestricted Upload of File with Dangerous Type
Reaching this weakness in YITH WooCommerce Gift Cards Premium < 3.3.1 takes a caller who can reach the endpoint. An unrestricted file upload lets a caller store a file whose type or destination the application does not properly constrain.
If an uploaded file lands anywhere the server will execute, the flaw becomes remote code execution and the site should be treated as fully compromised. For YITH WooCommerce Gift Cards Premium the fix is 3.3.1: builds < 3.3.1 are affected, anything from 3.3.1 onward is not.
Remediation
Update to version 3.3.1, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to YITH WooCommerce Gift Cards Premium: WordSec's web application firewall inspects request payloads before WordPress loads them. Classes like this one can leave something behind, so the staged malware scanner is the second half: it looks for dropped files and modified code rather than for the request that created them. None of that substitutes for the fix: YITH WooCommerce Gift Cards Premium 3.3.1 closes this, and updating the plugin is the step that ends it.
- Firewall
- Scanner
- Alerts
External References
Related records
Other vulnerabilities in YITH WooCommerce Gift Cards Premium
Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C