Protect yourself against future threats.
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AUSCERT External Security Bulletin Redistribution
ESB-2022.6110
heimdal security update
23 November 2022
===========================================================================
AusCERT Security Bulletin Summary
---------------------------------
Product: heimdal
Publisher: Debian
Operating System: Debian GNU/Linux
Resolution: Patch/Upgrade
CVE Names: CVE-2022-44640 CVE-2022-42898 CVE-2022-41916
CVE-2022-3437 CVE-2021-44758 CVE-2021-3671
Original Bulletin:
https://lists.debian.org/debian-security-announce/2022/msg00258.html
Comment: CVSS (Max): 7.5* CVE-2022-41916 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: NVD
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
* Not all CVSS available when published
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Debian Security Advisory DSA-5287-1 security@debian.org
https://www.debian.org/security/ Salvatore Bonaccorso
November 22, 2022 https://www.debian.org/security/faq
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Package : heimdal
CVE ID : CVE-2021-3671 CVE-2021-44758 CVE-2022-3437 CVE-2022-41916
CVE-2022-42898 CVE-2022-44640
Debian Bug : 996586
Several vulnerabilities were discovered in Heimdal, an implementation of
Kerberos 5 that aims to be compatible with MIT Kerberos.
CVE-2021-3671
Joseph Sutton discovered that the Heimdal KDC does not validate that
the server name in the TGS-REQ is present before dereferencing,
which may result in denial of service.
CVE-2021-44758
It was discovered that Heimdal is prone to a NULL dereference in
acceptors where an initial SPNEGO token that has no acceptable
mechanisms, which may result in denial of service for a server
application that uses SPNEGO.
CVE-2022-3437
Several buffer overflow flaws and non-constant time leaks were
discovered when using 1DES, 3DES or RC4 (arcfour).
CVE-2022-41916
An out-of-bounds memory access was discovered when Heimdal
normalizes Unicode, which may result in denial of service.
CVE-2022-42898
It was discovered that integer overflows in PAC parsing may result
in denial of service for Heimdal KDCs or possibly Heimdal servers.
CVE-2022-44640
It was discovered that the Heimdal's ASN.1 compiler generates code
that allows specially crafted DER encodings to invoke an invalid
free on the decoded structure upon decode error, which may result in
remote code execution in the Heimdal KDC.
For the stable distribution (bullseye), these problems have been fixed in
version 7.7.0+dfsg-2+deb11u2.
We recommend that you upgrade your heimdal packages.
For the detailed security status of heimdal please refer to its security
tracker page at:
https://security-tracker.debian.org/tracker/heimdal
Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/
Mailing list: debian-security-announce@lists.debian.org
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