The compilation daemon in Scala before 2.10.7, 2.11.x before 2.11.12, and 2.12.x before 2.12.4 uses weak permissions for private files in /tmp/scala-devel/${USER:shared}/scalac-compile-server-port, which allows local users to write to arbitrary class files and consequently gain privileges.
| Package (Ecosystem) | Introduced | Fixed | Limit |
|---|---|---|---|
| org.scala-lang:scala-compiler(Maven) | 0 | 2.10.7 | N/A |
| org.scala-lang:scala-compiler(Maven) | 2.11.0 | 2.11.12 | N/A |
| org.scala-lang:scala-compiler(Maven) | 2.12.0 | 2.12.4 | N/A |
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