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CVE-2025-27591

Date: March 11, 2025

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.

Severity Score

Related Resources (8)

https://www.facebook.com/security/advisories/cve-2025-27591
https://github.com/facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3
https://github.com/facebookincubator/below
https://github.com/facebookincubator/below/commit/10e73a21d67baa2cd613ee92ce999cda145e1a83
https://github.com/facebookincubator/below/security/advisories/GHSA-9mc5-7qhg-fp3w
https://nvd.nist.gov/vuln/detail/CVE-2025-27591
http://www.openwall.com/lists/oss-security/2025/03/12/1
https://www.mend.io/vulnerability-database/CVE-2025-27591

Severity Score

Weakness Type (CWE)

Incorrect Permission Assignment for Critical Resource

CWE-732

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): HIGH
Availability (A): NONE

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