Security update for krb5 SUSE Patch security@suse.de SUSE Security Team SUSE-SU-2025:3699-1 Final 1 1 2025-10-21T10:07:48Z current 2025-10-21T10:07:48Z 2025-10-21T10:07:48Z cve-database/bin/generate-cvrf.pl 2017-02-24T01:00:00Z Security update for krb5 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. The CVRF data is provided by SUSE under the Creative Commons License 4.0 with Attribution (CC-BY-4.0). SUSE-2025-3699,SUSE-SLE-Module-Basesystem-15-SP6-2025-3699,SUSE-SLE-Module-Basesystem-15-SP7-2025-3699,SUSE-SLE-Module-Server-Applications-15-SP6-2025-3699,SUSE-SLE-Module-Server-Applications-15-SP7-2025-3699,openSUSE-SLE-15.6-2025-3699 Copyright SUSE LLC under the Creative Commons License 4.0 with Attribution (CC-BY-4.0) https://www.suse.com/support/update/announcement/2025/suse-su-20253699-1/ Link for SUSE-SU-2025:3699-1 https://lists.suse.com/pipermail/sle-updates/2025-October/042240.html E-Mail link for SUSE-SU-2025:3699-1 https://www.suse.com/support/security/rating/ SUSE Security Ratings https://bugzilla.suse.com/1241219 SUSE Bug 1241219 https://www.suse.com/security/cve/CVE-2025-3576/ SUSE CVE CVE-2025-3576 page SUSE Linux Enterprise Module for Basesystem 15 SP6 SUSE Linux Enterprise Module for Basesystem 15 SP7 SUSE Linux Enterprise Module for Server Applications 15 SP6 SUSE Linux Enterprise Module for Server Applications 15 SP7 openSUSE Leap 15.6 krb5-1.20.1-150600.11.14.1 krb5-32bit-1.20.1-150600.11.14.1 krb5-64bit-1.20.1-150600.11.14.1 krb5-client-1.20.1-150600.11.14.1 krb5-devel-1.20.1-150600.11.14.1 krb5-devel-32bit-1.20.1-150600.11.14.1 krb5-devel-64bit-1.20.1-150600.11.14.1 krb5-mini-1.20.1-150600.11.14.1 krb5-mini-devel-1.20.1-150600.11.14.1 krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1 krb5-plugin-preauth-otp-1.20.1-150600.11.14.1 krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1 krb5-plugin-preauth-spake-1.20.1-150600.11.14.1 krb5-server-1.20.1-150600.11.14.1 krb5-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 krb5-32bit-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 krb5-client-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 krb5-devel-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 krb5-plugin-preauth-otp-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP6 krb5-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 krb5-32bit-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 krb5-client-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 krb5-devel-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 krb5-plugin-preauth-otp-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Basesystem 15 SP7 krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Server Applications 15 SP6 krb5-server-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Server Applications 15 SP6 krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Server Applications 15 SP7 krb5-server-1.20.1-150600.11.14.1 as a component of SUSE Linux Enterprise Module for Server Applications 15 SP7 krb5-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 krb5-32bit-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 krb5-client-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 krb5-devel-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 krb5-devel-32bit-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 krb5-plugin-preauth-otp-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 krb5-plugin-preauth-spake-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 krb5-server-1.20.1-150600.11.14.1 as a component of openSUSE Leap 15.6 A vulnerability in the MIT Kerberos implementation allows GSSAPI-protected messages using RC4-HMAC-MD5 to be spoofed due to weaknesses in the MD5 checksum design. If RC4 is preferred over stronger encryption types, an attacker could exploit MD5 collisions to forge message integrity codes. This may lead to unauthorized message tampering. CVE-2025-3576 SUSE Linux Enterprise Module for Basesystem 15 SP6:krb5-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP6:krb5-32bit-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP6:krb5-client-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP6:krb5-devel-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP6:krb5-plugin-preauth-otp-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP6:krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:krb5-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:krb5-32bit-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:krb5-client-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:krb5-devel-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:krb5-plugin-preauth-otp-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Basesystem 15 SP7:krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Server Applications 15 SP6:krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Server Applications 15 SP6:krb5-server-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1 SUSE Linux Enterprise Module for Server Applications 15 SP7:krb5-server-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-32bit-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-client-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-devel-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-devel-32bit-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-plugin-kdb-ldap-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-plugin-preauth-otp-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-plugin-preauth-pkinit-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-plugin-preauth-spake-1.20.1-150600.11.14.1 openSUSE Leap 15.6:krb5-server-1.20.1-150600.11.14.1 moderate To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch". https://www.suse.com/support/update/announcement/2025/suse-su-20253699-1/ https://www.suse.com/security/cve/CVE-2025-3576.html CVE-2025-3576 https://bugzilla.suse.com/1241218 SUSE Bug 1241218