CVE-2021-37750

Publication date 23 August 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

6.5 · Medium

Score breakdown

The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) before 1.18.5 and 1.19.x before 1.19.3 has a NULL pointer dereference in kdc/do_tgs_req.c via a FAST inner body that lacks a server field.

Read the notes from the security team

Status

Package Ubuntu Release Status
krb5 24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish Ignored end of life
21.04 hirsute Ignored end of life
20.04 LTS focal
Fixed 1.17-6ubuntu4.3
18.04 LTS bionic
Fixed 1.16-2ubuntu0.4
16.04 LTS xenial
Not affected
14.04 LTS trusty
Not affected

Notes

ccdm94

this vulnerability was introduced by commit 39548a5, as established by upstream. Prior to this commit, an error would occur instead of the null deference. In the patch notes, the CVE is described as affecting releases 1.14 and later only (meaning that xenial and trusty are not affected by this).

Patch details

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

Package Patch details
krb5

Severity score breakdown

Parameter Value
Base score 6.5 · Medium
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact None
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

    • USN-5959-1
    • Kerberos vulnerabilities
    • 16 March 2023

Other references