CVE-2024-3596

Publication date 9 July 2024

Last updated 9 November 2026

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

9.0 · Critical

Score breakdown

Description

RADIUS Protocol under RFC 2865 is susceptible to forgery attacks by a local attacker who can modify any valid Response (Access-Accept, Access-Reject, or Access-Challenge) to any other response using a chosen-prefix collision attack against MD5 Response Authenticator signature.

Read the notes from the security team

Mitigation

Disable the use of RADIUS/UDP and RADIUS/TCP - instead RADIUS/TLS or RADIUS/DTLS should be used.

Status

Package Ubuntu Release Status
freeradius 26.10 stonking
Not affected
26.04 LTS resolute
Not affected
25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Fixed in 3.2.5+dfsg-3~ubuntu24.04.1
23.10 mantic Ignored end of life, was needed
22.04 LTS jammy
Fixed in 3.0.26~dfsg~git20220223.1.00ed0241fa-0ubuntu3.3
20.04 LTS focal
Fixed in 3.0.20+dfsg-3ubuntu0.4
18.04 LTS bionic
Vulnerable
16.04 LTS xenial
Vulnerable
krb5 26.10 stonking
Fixed in 1.21.3-4ubuntu1
26.04 LTS resolute
Fixed in 1.21.3-4ubuntu1
25.10 questing
Fixed in 1.21.3-4ubuntu1
25.04 plucky
Fixed in 1.21.3-4ubuntu1
24.10 oracular
Fixed in 1.21.3-3ubuntu0.1
24.04 LTS noble
Fixed in 1.20.1-6ubuntu2.3
22.04 LTS jammy
Fixed in 1.19.2-2ubuntu0.5
20.04 LTS focal
Fixed in 1.17-6ubuntu4.8
18.04 LTS bionic
Fixed in 1.16-2ubuntu0.4+esm3
16.04 LTS xenial
Fixed in 1.13.2+dfsg-5ubuntu2.2+esm6
14.04 LTS trusty
Fixed in 1.12+dfsg-2ubuntu5.4+esm6
libpam-radius-auth 26.10 stonking
Not affected
26.04 LTS resolute
Not affected
25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular Ignored end of life, was needs-triage
24.04 LTS noble
Needs evaluation
22.04 LTS jammy
Vulnerable
20.04 LTS focal
Needs evaluation
18.04 LTS bionic
Needs evaluation
16.04 LTS xenial
Needs evaluation
14.04 LTS trusty
Needs evaluation

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Notes

alexmurray

RADIUS clients may also be affected

mdeslaur

This vulnerability is known as Blast-RADIUS Added krb5 to this CVE as libkrad in krb5 does not contain support for the Message-Authenticator, preventing this vulnerability from being addressed between libkrad and a radius server. Note: libkrad0 binary package is in the universe pocket.

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
freeradius
libpam-radius-auth

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.0 · Critical

Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-7055-1
    • FreeRADIUS vulnerability
    • 3 October 2024
    • USN-7257-1
    • Kerberos vulnerability
    • 5 February 2025

Other references

Access our resources on patching vulnerabilities