GHSA-9mc5-7qhg-fp3w

Below has Incorrect Permission Assignment for Critical Resource

Source: GitHub Advisory Database (reviewed) High CVE-2025-27591

Packages

Ecosystem	Package	Affected	Fixed in
crates.io	below	< 0.9.0	0.9.0

Details

As written in the advisory (Markdown source, shown as plain text).

### Impact A privilege escalation vulnerability existed in the Below service prior to v0.9.0 due to the creation of a world-writable directory at /var/log/below. This could have allowed local unprivileged users to escalate to root privileges through symlink attacks that manipulate files such as /etc/shadow. ### Patches https://github.com/facebookincubator/below/commit/10e73a21d67baa2cd613ee92ce999cda145e1a83 This is included in version 0.9.0 ### Workarounds Change the permission on `/var/log/below` manually ### References https://www.facebook.com/security/advisories/cve-2025-27591 https://www.cve.org/CVERecord?id=CVE-2025-27591

References

External links from the advisory. They lead to third-party sites.

https://github.com/facebookincubator/below/security/advisories/GHSA-9mc5-7qhg-fp3w web
https://nvd.nist.gov/vuln/detail/CVE-2025-27591 advisory
https://github.com/facebookincubator/below/commit/10e73a21d67baa2cd613ee92ce999cda145e1a83 web
https://github.com/facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3 web
https://github.com/facebookincubator/below package
https://rustsec.org/advisories/RUSTSEC-2025-0149.html web
https://www.facebook.com/security/advisories/cve-2025-27591 web
https://www.openwall.com/lists/oss-security/2025/03/12/1 web
http://www.openwall.com/lists/oss-security/2025/03/12/1 web