QID 982833

QID 982833: Java (maven) Security Update for com.netflix.hollow:hollow (GHSA-9295-mhf3-v33m)

> 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.

Successful exploitation of this vulnerability may affect the confidentiality, integrity, and availability of the targeted user.

CVSS V3 rated as Medium - 4.4 severity.

CVSS V2 rated as Medium - 3.6 severity.

Solution

Customers are advised to refer to GHSA-9295-mhf3-v33m for updates pertaining to this vulnerability.

Vendor References

GHSA-9295-mhf3-v33m - github.com/advisories/GHSA-9295-mhf3-v33m

CVEs related to QID 982833

CVE-2021-28099 |

Software Advisories

Advisory ID	Software	Component	Link
GHSA-9295-mhf3-v33m	com.netflix.hollow:hollow		github.com/advisories/GHSA-9295-mhf3-v33m

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