-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA512
=============================================================================
FreeBSD-SA-22:14.heimdal Security Advisory
The FreeBSD Project
Topic: Multiple vulnerabilities in Heimdal
Category: contrib
Module: heimdal
Announced: 2022-11-15
Affects: All supported versions of FreeBSD.
Corrected: 2022-11-15 21:15:35 UTC (stable/13, 13.1-STABLE)
2022-11-16 01:50:27 UTC (releng/13.1, 13.1-RELEASE-p4)
2022-11-15 21:16:56 UTC (stable/12, 12.4-STABLE)
2022-11-16 01:47:57 UTC (releng/12.4, 12.4-RC2-p1)
2022-11-16 01:40:21 UTC (releng/12.3, 12.3-RELEASE-p9)
CVE Name: CVE-2019-14870, CVE-2022-3437, CVE-2022-42898,
CVE-2022-44640, CVE-2021-44758
For general information regarding FreeBSD Security Advisories,
including descriptions of the fields above, security branches, and the
following sections, please visit <URL:https://security.FreeBSD.org/>.
I. Background
Heimdal implements the Kerberos 5 network authentication protocols.
A Key Distribution Center (KDC) is trusted by all principals registered
in that administrative "realm" to store a secret key in confidence, of
which, the proof of knowledge is used to verify the authenticity of a
principal.
II. Problem Description
Multiple security vulnerabilities have been discovered in the Heimdal
implementation of the Kerberos 5 network authentication protocols and KDC.
- - CVE-2022-42898 PAC parse integer overflows
- - CVE-2022-3437 Overflows and non-constant time leaks in DES{,3} and arcfour
- - CVE-2021-44758 NULL dereference DoS in SPNEGO acceptors
- - CVE-2022-44640 Heimdal KDC: invalid free in ASN.1 codec
- - CVE-2019-14870 Validate client attributes in protocol-transition
- - CVE-2019-14870 Apply forwardable policy in protocol-transition
- - CVE-2019-14870 Always lookup impersonate client in DB
III. Impact
A malicious actor with control of the network between a client and a service
using Kerberos for authentication can impersonate either the client or the
service, enabling a man-in-the-middle (MITM) attack circumventing mutual
authentication.
Note that, while CVE-2022-44640 is a severe vulnerability, possibly enabling
remote code execution on other platforms, the version of Heimdal included with
the FreeBSD base system cannot be exploited in this way on FreeBSD.
IV. Workaround
No workaround is available, but only systems using Kerberos are affected.
V. Solution
Upgrade your vulnerable system to a supported FreeBSD stable or
release / security branch (releng) dated after the correction date.
A reboot is recommended.
Perform one of the following:
1) To update your vulnerable system via a binary patch:
Systems running a RELEASE version of FreeBSD on the amd64, i386, or
(on FreeBSD 13 and later) arm64 platforms can be updated via the
freebsd-update(8) utility:
# freebsd-update fetch
# freebsd-update install
A reboot is recommended.
2) To update your vulnerable system via a source code patch:
The following patches have been verified to apply to the applicable
FreeBSD release branches.
a) Download the relevant patch from the location below, and verify the
detached PGP signature using your PGP utility.
# fetch https://security.FreeBSD.org/patches/SA-22:14/heimdal.patch
# fetch https://security.FreeBSD.org/patches/SA-22:14/heimdal.patch.asc
# gpg --verify heimdal.patch.asc
b) Apply the patch. Execute the following commands as root:
# cd /usr/src
# patch < /path/to/patch
c) Recompile the operating system using buildworld and installworld as
described in <URL:https://www.FreeBSD.org/handbook/makeworld.html>.
Restart all daemons that use the Kerberos, or reboot the system.
VI. Correction details
This issue is corrected by the corresponding Git commit hash or Subversion
revision number in the following stable and release branches:
Branch/path Hash Revision
- -------------------------------------------------------------------------
stable/13/ d0b6550173d2 stable/13-n253097
releng/13.1/ a1e014e89282 releng/13.1-n250170
stable/12/ r372752
releng/12.4/ r372755
releng/12.3/ r372753
- -------------------------------------------------------------------------
For FreeBSD 13 and later:
Run the following command to see which files were modified by a
particular commit:
# git show --stat <commit hash>
Or visit the following URL, replacing NNNNNN with the hash:
<URL:https://cgit.freebsd.org/src/commit/?id=NNNNNN>
To determine the commit count in a working tree (for comparison against
nNNNNNN in the table above), run:
# git rev-list --count --first-parent HEAD
For FreeBSD 12 and earlier:
Run the following command to see which files were modified by a particular
revision, replacing NNNNNN with the revision number:
# svn diff -cNNNNNN --summarize svn://svn.freebsd.org/base
Or visit the following URL, replacing NNNNNN with the revision number:
<URL:https://svnweb.freebsd.org/base?view=revision&revision=NNNNNN>
VII. References
<URL:https://github.com/heimdal/heimdal/releases/tag/heimdal-7.8.0>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-14870>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44758>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-3437>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-42898>
<URL:https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2022-44640>
The latest revision of this advisory is available at
<URL:https://security.FreeBSD.org/advisories/FreeBSD-SA-22:14.heimdal.asc>
-----BEGIN PGP SIGNATURE-----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=jmOK
-----END PGP SIGNATURE-----