CVE-2021-32751

A flaw was found in Gradle, which allows a remote, authenticated attacker to execute arbitrary code on the system caused by a flaw in start and gradlew. By sending specially crafted environment variables, an attacker can execute arbitrary code on the system.

Mitigation

CI/CD systems using the Gradle build tool
- You are not vulnerable if untrusted users are unable to change environment variables for the user that executes gradlew.
- If you are unable to upgrade to Gradle 7.2, you can generate a new gradlew script with Gradle 7.2 and use it for older versions of Gradle.

Applications using start scripts generated by Gradle
- You are not vulnerable if untrusted users are unable to change environment variables for the user that executes the start script.
- If you are unsure, the vulnerable start script could be manually patched to remove the use of eval or the use of environment variables that affect the application's command-line.
- If the application is simple enough, you may be able to avoid the use of the start scripts by running the application directly with the Java command.