SUSE-SU-2025:3699-1: moderate: Security update for krb5

[SLE-UPDATES]

# Security update for krb5

Announcement ID: SUSE-SU-2025:3699-1  
Release Date: 2025-10-21T10:08:11Z  
Rating: moderate  
References:

  * bsc#1241219

  
Cross-References:

  * CVE-2025-3576

  
CVSS scores:

  * CVE-2025-3576 ( SUSE ):  8.2
    CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2025-3576 ( SUSE ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
  * CVE-2025-3576 ( NVD ):  5.9 CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

  
Affected Products:

  * Basesystem Module 15-SP6
  * Basesystem Module 15-SP7
  * openSUSE Leap 15.6
  * Server Applications Module 15-SP6
  * Server Applications Module 15-SP7
  * SUSE Linux Enterprise Desktop 15 SP6
  * SUSE Linux Enterprise Desktop 15 SP7
  * SUSE Linux Enterprise Real Time 15 SP6
  * SUSE Linux Enterprise Real Time 15 SP7
  * SUSE Linux Enterprise Server 15 SP6
  * SUSE Linux Enterprise Server 15 SP7
  * SUSE Linux Enterprise Server for SAP Applications 15 SP6
  * SUSE Linux Enterprise Server for SAP Applications 15 SP7

  
  
An update that solves one vulnerability can now be installed.

## Description:

This update for krb5 fixes the following issues:

  * CVE-2025-3576: weakness in the MD5 checksum design allows for spoofing of
    GSSAPI-protected messages that are using RC4-HMAC-MD5 (bsc#1241219).

Krb5 as very old protocol supported quite a number of ciphers that are not
longer up to current cryptographic standards.

To avoid problems with those, SUSE has by default now disabled those alorithms.

The following algorithms have been removed from valid krb5 enctypes:

  * des3-cbc-sha1
  * arcfour-hmac-md5

To reenable those algorithms, you can use allow options in krb5.conf:

[libdefaults] allow_des3 = true allow_rc4 = true

to reenable them.

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * openSUSE Leap 15.6  
    zypper in -t patch SUSE-2025-3699=1 openSUSE-SLE-15.6-2025-3699=1

  * Basesystem Module 15-SP6  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP6-2025-3699=1

  * Basesystem Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Basesystem-15-SP7-2025-3699=1

  * Server Applications Module 15-SP6  
    zypper in -t patch SUSE-SLE-Module-Server-Applications-15-SP6-2025-3699=1

  * Server Applications Module 15-SP7  
    zypper in -t patch SUSE-SLE-Module-Server-Applications-15-SP7-2025-3699=1

## Package List:

  * openSUSE Leap 15.6 (aarch64 ppc64le s390x x86_64 i586)
    * krb5-plugin-preauth-otp-1.20.1-150600.11.14.1
    * krb5-devel-1.20.1-150600.11.14.1
    * krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1
    * krb5-plugin-kdb-ldap-debuginfo-1.20.1-150600.11.14.1
    * krb5-mini-1.20.1-150600.11.14.1
    * krb5-debugsource-1.20.1-150600.11.14.1
    * krb5-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-otp-debuginfo-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-spake-debuginfo-1.20.1-150600.11.14.1
    * krb5-client-debuginfo-1.20.1-150600.11.14.1
    * krb5-server-debuginfo-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-spake-1.20.1-150600.11.14.1
    * krb5-mini-debugsource-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-pkinit-debuginfo-1.20.1-150600.11.14.1
    * krb5-debuginfo-1.20.1-150600.11.14.1
    * krb5-mini-devel-1.20.1-150600.11.14.1
    * krb5-mini-debuginfo-1.20.1-150600.11.14.1
    * krb5-client-1.20.1-150600.11.14.1
    * krb5-server-1.20.1-150600.11.14.1
  * openSUSE Leap 15.6 (x86_64)
    * krb5-32bit-1.20.1-150600.11.14.1
    * krb5-devel-32bit-1.20.1-150600.11.14.1
    * krb5-32bit-debuginfo-1.20.1-150600.11.14.1
  * openSUSE Leap 15.6 (aarch64_ilp32)
    * krb5-64bit-debuginfo-1.20.1-150600.11.14.1
    * krb5-devel-64bit-1.20.1-150600.11.14.1
    * krb5-64bit-1.20.1-150600.11.14.1
  * Basesystem Module 15-SP6 (aarch64 ppc64le s390x x86_64)
    * krb5-plugin-preauth-otp-1.20.1-150600.11.14.1
    * krb5-devel-1.20.1-150600.11.14.1
    * krb5-debugsource-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-otp-debuginfo-1.20.1-150600.11.14.1
    * krb5-client-debuginfo-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-pkinit-debuginfo-1.20.1-150600.11.14.1
    * krb5-debuginfo-1.20.1-150600.11.14.1
    * krb5-1.20.1-150600.11.14.1
    * krb5-client-1.20.1-150600.11.14.1
  * Basesystem Module 15-SP6 (x86_64)
    * krb5-32bit-1.20.1-150600.11.14.1
    * krb5-32bit-debuginfo-1.20.1-150600.11.14.1
  * Basesystem Module 15-SP7 (aarch64 ppc64le s390x x86_64)
    * krb5-plugin-preauth-otp-1.20.1-150600.11.14.1
    * krb5-devel-1.20.1-150600.11.14.1
    * krb5-debugsource-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-otp-debuginfo-1.20.1-150600.11.14.1
    * krb5-client-debuginfo-1.20.1-150600.11.14.1
    * krb5-plugin-preauth-pkinit-debuginfo-1.20.1-150600.11.14.1
    * krb5-debuginfo-1.20.1-150600.11.14.1
    * krb5-1.20.1-150600.11.14.1
    * krb5-client-1.20.1-150600.11.14.1
  * Basesystem Module 15-SP7 (x86_64)
    * krb5-32bit-1.20.1-150600.11.14.1
    * krb5-32bit-debuginfo-1.20.1-150600.11.14.1
  * Server Applications Module 15-SP6 (aarch64 ppc64le s390x x86_64)
    * krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1
    * krb5-plugin-kdb-ldap-debuginfo-1.20.1-150600.11.14.1
    * krb5-debugsource-1.20.1-150600.11.14.1
    * krb5-server-debuginfo-1.20.1-150600.11.14.1
    * krb5-debuginfo-1.20.1-150600.11.14.1
    * krb5-server-1.20.1-150600.11.14.1
  * Server Applications Module 15-SP7 (aarch64 ppc64le s390x x86_64)
    * krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1
    * krb5-plugin-kdb-ldap-debuginfo-1.20.1-150600.11.14.1
    * krb5-debugsource-1.20.1-150600.11.14.1
    * krb5-server-debuginfo-1.20.1-150600.11.14.1
    * krb5-debuginfo-1.20.1-150600.11.14.1
    * krb5-server-1.20.1-150600.11.14.1

## References:

  * https://www.suse.com/security/cve/CVE-2025-3576.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1241219

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