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{"bugzilla": {"description": "gradle: Arbitrary code execution via specially crafted environment variables", "id": "2239392", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2239392"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-78", "details": ["Gradle is a build tool with a focus on build automation. In versions prior to 7.2, start scripts generated by the `application` plugin and the `gradlew` script are both vulnerable to arbitrary code execution when an attacker is able to change environment variables for the user running the script. This may impact those who use `gradlew` on Unix-like systems or use the scripts generated by Gradle in thieir application on Unix-like systems. For this vulnerability to be exploitable, an attacker needs to be able to set the value of particular environment variables and have those environment variables be seen by the vulnerable scripts. This issue has been patched in Gradle 7.2 by removing the use of `eval` and requiring the use of the `bash` shell. There are a few workarounds available. For CI/CD systems using the Gradle build tool, one may ensure that untrusted users are unable to change environment variables for the user that executes `gradlew`. If one is unable to upgrade to Gradle 7.2, one may generate a new `gradlew` script with Gradle 7.2 and use it for older versions of Gradle. Fpplications using start scripts generated by Gradle, one may ensure that untrusted users are unable to change environment variables for the user that executes the start script. A 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, one may be able to avoid the use of the start scripts by running the application directly with Java command.", "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": {"lang": "en:us", "value": "CI/CD systems using the Gradle build tool\n- You are not vulnerable if untrusted users are unable to change environment variables for the user that executes gradlew.\n- 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.\nApplications using start scripts generated by Gradle\n- You are not vulnerable if untrusted users are unable to change environment variables for the user that executes the start script.\n- 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.\n- 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."}, "name": "CVE-2021-32751", "package_state": [{"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:6", "fix_state": "Out of support scope", "package_name": "gradle", "product_name": "Red Hat JBoss Enterprise Application Platform 6"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:7", "fix_state": "Not affected", "package_name": "gradle", "product_name": "Red Hat JBoss Enterprise Application Platform 7"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Not affected", "package_name": "gradle", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}, {"cpe": "cpe:/a:redhat:rhel_software_collections:3", "fix_state": "Will not fix", "package_name": "rh-maven36-byte-buddy", "product_name": "Red Hat Software Collections"}], "public_date": "2021-07-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-32751\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-32751\nhttps://github.com/gradle/gradle/security/advisories/GHSA-6j2p-252f-7mw8"], "statement": "To exploit this vulnerability, an attacker needs to be able to set the value of particular environment variables and have those environment variables be seen by the vulnerable scripts. This requirement makes this CVE of a Moderate impact.", "threat_severity": "Moderate", "upstream_fix": "Gradle 7.2"}