Strategic Overview
- Status
- Patched in 2.7.3
- Affected Plugin
- OptionTree
- Affected Version
<= 2.7.2- CVSS
- 8.1High
- Weakness type
- CWE-502 · Deserialization of Untrusted Data
- CVE
CVE-2019-15320
At a glance
CVE-2019-15320 is a high-severity Deserialization of Untrusted Data vulnerability in the OptionTree WordPress plugin, affecting versions <= 2.7.2. It carries a CVSS score of 8.1 (reachable over the network; high confidentiality, integrity, availability impact). Exploitation requires no authentication. The issue is fixed in version 2.7.3; sites on affected versions should update now. Disclosed May 2019.
Vulnerability Overview
The option-tree plugin before 2.7.3 for WordPress has Object Injection because the + character is mishandled.
Technical Analysis
The vector marks this flaw as remotely reachable over the network, 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-502: Deserialization of Untrusted Data
Reaching this weakness in OptionTree <= 2.7.2 takes a caller who can reach the endpoint. Deserialization of untrusted data means the application reconstructs objects from input a caller controls, letting the attacker choose which classes get instantiated and what their properties hold.
A workable chain turns deserialization into file writes, deletions or code execution, depending on what the loaded classes do in their magic methods. For OptionTree the fix is 2.7.3: builds <= 2.7.2 are affected, anything from 2.7.3 onward is not.
Remediation
Update to version 2.7.3, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to OptionTree: 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: OptionTree 2.7.3 closes this, and updating the plugin is the step that ends it.
- Firewall
- Scanner
- Alerts
External References
Related records
Same weakness class
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