CVE-2022-42898

Publication date 25 December 2022

Last updated 11 July 2025

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

8.8 · High

Score breakdown

Description

PAC parsing in MIT Kerberos 5 (aka krb5) before 1.19.4 and 1.20.x before 1.20.1 has integer overflows that may lead to remote code execution (in KDC, kadmind, or a GSS or Kerberos application server) on 32-bit platforms (which have a resultant heap-based buffer overflow), and cause a denial of service on other platforms. This occurs in krb5_pac_parse in lib/krb5/krb/pac.c. Heimdal before 7.7.1 has "a similar bug."

Read the notes from the security team

Status

Package Ubuntu Release Status
heimdal 25.10 questing
Vulnerable
25.04 plucky
Vulnerable
24.10 oracular Ignored end of life, was needed
24.04 LTS noble
Vulnerable
23.10 mantic Ignored end of life, was needed
23.04 lunar Ignored end of life, was needed
22.10 kinetic Ignored end of life, was needed
22.04 LTS jammy
Vulnerable
20.04 LTS focal
Fixed 7.7.0+dfsg-1ubuntu1.3
18.04 LTS bionic
Fixed 7.5.0+dfsg-1ubuntu0.3
16.04 LTS xenial
Fixed 1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3
14.04 LTS trusty
Fixed 1.6~git20131207+dfsg-1ubuntu1.2+esm3
samba 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Fixed 2:4.16.8+dfsg-0ubuntu1
22.04 LTS jammy
Fixed 2:4.15.13+dfsg-0ubuntu1
20.04 LTS focal
Fixed 2:4.15.13+dfsg-0ubuntu0.20.04.1
18.04 LTS bionic
Fixed 2:4.7.6+dfsg~ubuntu-0ubuntu2.29+esm1
16.04 LTS xenial
Fixed 2:4.3.11+dfsg-0ubuntu0.16.04.34+esm2
14.04 LTS trusty
Fixed 2:4.3.11+dfsg-0ubuntu0.14.04.20+esm13
krb5 25.10 questing
Not affected
25.04 plucky
Not affected
24.10 oracular
Not affected
24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Fixed 1.20-1ubuntu0.1
22.04 LTS jammy
Fixed 1.19.2-2ubuntu0.1
20.04 LTS focal
Fixed 1.17-6ubuntu4.2
18.04 LTS bionic
Fixed 1.16-2ubuntu0.3
16.04 LTS xenial
Fixed 1.13.2+dfsg-5ubuntu2.2+esm3
14.04 LTS trusty
Fixed 1.12+dfsg-2ubuntu5.4+esm3

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Notes

mdeslaur

Per upstream Samba advisory, this is only an issue on 32-bit systems.

rodrigo-zaiden

a regression in heimdal was reported by samba and fixed in https://github.com/heimdal/heimdal/pull/1025

mdeslaur

See samba bug for samba regression fix not yet commited The focal samba update was temporarily reverted by USN 5822-2 because it introduced regressions. It was later updated again with USN 5936-1.

Patch details

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

Package Patch details
heimdal
samba
krb5

Severity score breakdown

Parameter Value
Base score 8.8 · High
Attack vector Network
Attack complexity Low
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality High
Integrity impact High
Availability impact High
Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

Other references