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CVE-2022-42898

Published: 25 December 2022

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."

Notes

AuthorNote
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.

Priority

Medium

Cvss 3 Severity Score

8.8

Score breakdown

Status

Package Release Status
heimdal
Launchpad, Ubuntu, Debian
bionic
Released (7.5.0+dfsg-1ubuntu0.3)
trusty
Released (1.6~git20131207+dfsg-1ubuntu1.2+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
xenial
Released (1.7~git20150920+dfsg-4ubuntu1.16.04.1+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
jammy Needed

kinetic Ignored
(end of life, was needed)
upstream
Released (7.7.1, 7.8, 7.8.git20221115.a6cf945+dfsg-1)
focal
Released (7.7.0+dfsg-1ubuntu1.3)
lunar Ignored
(end of life, was needed)
mantic Needed

Patches:
upstream: https://github.com/heimdal/heimdal/commit/b90b219ab8faa6bb0e7c2e7aa241aa7eeab0adac
upstream: https://github.com/heimdal/heimdal/commit/0c56257bdac80da015878fffdb0f8a42b8d73246 (7.7.1)
upstream: https://github.com/heimdal/heimdal/commit/9d1bfab9882d0aa14ae0981e6667c93db93ffc5d (regression)









Binaries built from this source package are in Universe and so are supported by the community.
samba
Launchpad, Ubuntu, Debian
upstream
Released (2:4.17.3+dfsg-1,4.17.3,4.16.7,4.15.12)
bionic Needed

focal
Released (2:4.15.13+dfsg-0ubuntu0.20.04.1)
jammy
Released (2:4.15.13+dfsg-0ubuntu1)
kinetic
Released (2:4.16.8+dfsg-0ubuntu1)
trusty Needed

xenial Needs triage

lunar Not vulnerable
(2:4.17.3+dfsg-3ubuntu1)
mantic Not vulnerable
(2:4.17.3+dfsg-3ubuntu1)
Patches:






upstream: https://git.samba.org/?p=samba.git;a=commit;h=a8ef840d4362d3ffeab13c1d5fea417511b727c2 (4.16.7)
upstream: https://git.samba.org/?p=samba.git;a=commit;h=8369aee33a0b3de10485dc72223f4653585e3a79 (4.15.12)
upstream: https://git.samba.org/?p=samba.git;a=commit;h=f792d3e3906414d836d186ec279586c13a83ba8d (4.15.12)
upstream: https://git.samba.org/?p=samba.git;a=commit;h=9c909c57ce7abacd96ba18173a9dc4ba9a7c0230 (4.15.12)
upstream: https://git.samba.org/?p=samba.git;a=commit;h=a3816433ae971830c2b16b366b10283aeb5a87b5 (4.15.12)
upstream: https://git.samba.org/?p=samba.git;a=commit;h=f3672577a8e15b7937d0067a262d04df632dade9 (4.15.13 regre)
krb5
Launchpad, Ubuntu, Debian
kinetic
Released (1.20-1ubuntu0.1)
trusty
Released (1.12+dfsg-2ubuntu5.4+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
upstream
Released (1.20.1-1, 1.20.1, 1.19.4)
xenial
Released (1.13.2+dfsg-5ubuntu2.2+esm3)
Available with Ubuntu Pro or Ubuntu Pro (Infra-only)
focal
Released (1.17-6ubuntu4.2)
jammy
Released (1.19.2-2ubuntu0.1)
bionic
Released (1.16-2ubuntu0.3)
lunar Not vulnerable
(1.20.1-1build1)
mantic Not vulnerable
(1.20.1-1build1)
Patches:



upstream: https://github.com/krb5/krb5/commit/ea92d2f0fcceb54a70910fa32e9a0d7a5afc3583 (master)
upstream: https://github.com/krb5/krb5/commit/b99de751dd35360c0fccac74a40f4a60dbf1ceea (1.20)
upstream: https://github.com/krb5/krb5/commit/4e661f0085ec5f969c76c0896a34322c6c432de4 (1.19)






Binaries built from this source package are in Universe and so are supported by the community.

Severity score breakdown

Parameter Value
Base score 8.8
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