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Published 20 hours ago • verified publisher icon MidnightBSD

CVE-2025-5994 (High) detected in freebsd-srcrelease/14.3.0-p2, freebsd-srcrelease/14.3.0-p2

Open mend-bolt-for-github[bot] opened this issue 3 months ago • 3 comments

CVE-2025-5994 - High Severity Vulnerability

Vulnerable Libraries - freebsd-srcrelease/14.3.0-p2, freebsd-srcrelease/14.3.0-p2

freebsd-srcrelease/14.3.0-p2

The FreeBSD src tree publish-only repository. Experimenting with 'simple' pull requests....

Library home page: https://github.com/freebsd/freebsd-src.git

Vulnerable Source Files (2)

/contrib/unbound/edns-subnet/subnetmod.h /contrib/unbound/edns-subnet/subnetmod.c

freebsd-srcrelease/14.3.0-p2

The FreeBSD src tree publish-only repository. Experimenting with 'simple' pull requests....

Library home page: https://github.com/freebsd/freebsd-src.git

Vulnerable Source Files (2)

/contrib/unbound/edns-subnet/subnetmod.h /contrib/unbound/edns-subnet/subnetmod.c

Found in HEAD commit: 816463d989cc5839c1cca2efb5bf2503408507fb

Found in base branches: stable/3.2, master

Vulnerability Details

A multi-vendor cache poisoning vulnerability named 'Rebirthday Attack' has been discovered in caching resolvers that support EDNS Client Subnet (ECS). Unbound is also vulnerable when compiled with ECS support, i.e., '--enable-subnet', AND configured to send ECS information along with queries to upstream name servers, i.e., at least one of the 'send-client-subnet', 'client-subnet-zone' or 'client-subnet-always-forward' options is used. Resolvers supporting ECS need to segregate outgoing queries to accommodate for different outgoing ECS information. This re-opens up resolvers to a birthday paradox attack (Rebirthday Attack) that tries to match the DNS transaction ID in order to cache non-ECS poisonous replies.

Publish Date: 2025-07-16

URL: CVE-2025-5994

CVSS 3 Score Details (7.5)

Base Score Metrics:

  • Exploitability Metrics:
    • Attack Vector: Network
    • Attack Complexity: Low
    • Privileges Required: None
    • User Interaction: None
    • Scope: Unchanged
  • Impact Metrics:
    • Confidentiality Impact: None
    • Integrity Impact: High
    • Availability Impact: None
For more information on CVSS3 Scores, click here.

Suggested Fix

Type: Upgrade version

Release Date: 2025-07-16

Fix Resolution: https://github.com/NLnetLabs/unbound.git - release-1.23.1

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mend-bolt-for-github[bot] avatar Aug 14 '25 20:08 mend-bolt-for-github[bot]