CVE-2020-1945

Apache Ant 1.1 to 1.9.14 and 1.10.0 to 1.10.7 uses the default temporary directory identified by the Java system property java.io.tmpdir for several tasks and may thus leak sensitive information. The fixcrlf and replaceregexp tasks also copy files from the temporary directory back into the build tree allowing an attacker to inject modified source files into the build process.

Mitigation

For versions 1.1 to 1.9.14 and 1.10.0 to 1.10.7, set the java.io.tmpdir system property to a private directory-- only readable and writable by the current user-- before running Ant.

For versions 1.9.15 and 1.10.8, use the Ant property ant.tmpfile instead. Ant 1.10.8 protects the temporary files if the underlying filesystem allows it, but using a private temporary directory is still recommended.