CVE-2025-27591

Summary

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.

Affected Software

Weaknesses

• Incorrect Permission Assignment for Critical Resource (CWE-732)

ADP Enrichment

CVE Program Container

Additional References

• http://www.openwall.com/lists/oss-security/2025/03/12/1

CISA ADP Vulnrichment

• SSVC:
• Exploitation: none
  • Automatable: no
  • Technical Impact: total

References

• https://www.facebook.com/security/advisories/cve-2025-27591
• https://github.com/facebookincubator/below/commit/da9382e6e3e332fd2c3195e22f34977f83f0f1f3

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