Strategic Overview
- Status
- Patched in 0.94
- Affected Plugin
- Google Forms
- Affected Version
< 0.94- CVSS
- 7.5High
- Weakness type
- CWE-94 · Improper Control of Generation of Code ('Code Injection')
- CVE
CVE-2018-20988
At a glance
CVE-2018-20988 is a high-severity Improper Control of Generation of Code ('Code Injection') vulnerability in the Google Forms WordPress plugin, affecting versions < 0.94. It carries a CVSS score of 7.5 (reachable over the network; low attack complexity; high integrity impact). Exploitation requires no authentication. The issue is fixed in version 0.94; sites on affected versions should update now. Disclosed May 2018.
Vulnerability Overview
The wpgform plugin before 0.94 for WordPress has eval injection in the CAPTCHA calculation.
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 integrity.
CWE-94: Improper Control of Generation of Code ('Code Injection')
Reaching this weakness in Google Forms < 0.94 takes a caller who can reach the endpoint. Code injection means input from a request reaches a language construct that evaluates code, so the attacker's text is executed rather than treated as data.
The injected code runs with the web server's privileges, giving the attacker the same access to the database and filesystem as WordPress itself. For Google Forms the fix is 0.94: builds < 0.94 are affected, anything from 0.94 onward is not.
Remediation
Update to version 0.94, or a newer patched version
How does WordSec protect against this?
The attempt arrives as an ordinary request to Google Forms: 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: Google Forms 0.94 closes this, and updating the plugin is the step that ends it.
- Firewall
- Scanner
- Alerts
External References
Related records
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