GHSA-9295-mhf3-v33m

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GHSA-9295-mhf3-v33m

Summary: Insecure temporary file in Netflix OSS Hollow

Details: > 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.

References: https://github.com/JLLeitschuh/security-research/security/advisories/GHSA-j83w-7qr9-wv86, https://nvd.nist.gov/vuln/detail/CVE-2021-28099, https://github.com/Netflix/hollow/issues/502, https://github.com/Netflix/security-bulletins/blob/master/advisories/nflx-2021-001.md