GHSA-9295-mhf3-v33m Insecure temporary file in Netflix OSS Hollow

• Maven com.netflix.hollow:hollow: <= 6.1.0 (no fix yet)

> ID: NFLX-2021-001 > Title: Local information disclosure in Hollow > Release Date: 2021-03-23 > Credit: Security Researcher @JLLeitschuh Overview Security researcher @JLLeitschuh reported that Netflix Hollow (a Netflix OSS project available here: https://github.com/Netflix/hollow) writes to a local temporary directory before validating the permissions on it. Impact An attacker with the ability to create directories and set permissions on the local filesystem could pre-create this directory and read or modify anything written there by the Hollow process. Description Since the `Files.exists(parent)` is run before creating the directories, an attacker can pre-create these directories with wide permissions. Additionally, since an insecure source of randomness is used, the file names to be created can be deterministically calculated. Workarounds and Fixes Avoid running Hollow in configurations that share a filesystem with less-trusted processes. May be fixed in a future release.