facebookincubator/below · Security
Below has Incorrect Permission Assignment for Critical Resource
- GHSA ID
- GHSA-9mc5-7qhg-fp3w
- CVE ID
- CVE-2025-27591
- Severity
- high
- Published
- Updated
- CVSS
- 7.8 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS v3
- 7.8 · CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- CVSS v4
- 7.3 · CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Description
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
CWEs
- CWE-732 · Incorrect Permission Assignment for Critical Resource
References
- https://github.com/facebookincubator/below/security/advisories/GHSA-9mc5-7qhg-fp3w ↗
- https://github.com/facebookincubator/below/commit/10e73a21d67baa2cd613ee92ce999cda145e1a83 ↗
- https://www.facebook.com/security/advisories/cve-2025-27591 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2025-27591 ↗
- http://www.openwall.com/lists/oss-security/2025/03/12/1 ↗
- https://github.com/facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3 ↗
- https://rustsec.org/advisories/RUSTSEC-2025-0149.html ↗
- https://www.openwall.com/lists/oss-security/2025/03/12/1 ↗
- https://github.com/advisories/GHSA-9mc5-7qhg-fp3w ↗