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openSUSE: krb5 Moderate Spoofing Issue Vulnerability 2025:3729-1

opensuse
Calendar Grey October 22, 2025
Dist Opensuse Esm H88
Krb5 security fix for openSUSE mitigates spoofing risks in GSSAPI messaging. Update suggested for enhanced protection.
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.

Topics%20covered

Topics Covered

security advisory moderate authentication krb5 deny service OpenSUSE

Patch

## 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:

* SUSE Linux Enterprise Micro for Rancher 5.4

zypper in -t patch SUSE-SLE-Micro-5.4-2025-3729=1

* SUSE Linux Enterprise Micro 5.4

zypper in -t patch SUSE-SLE-Micro-5.4-2025-3729=1

* openSUSE Leap 15.4

zypper in -t patch SUSE-2025-3729=1

* SUSE Linux Enterprise Micro for Rancher 5.3

zypper in -t patch SUSE-SLE-Micro-5.3-2025-3729=1

* SUSE Linux Enterprise Micro 5.3

zypper in -t patch SUSE-SLE-Micro-5.3-2025-3729=1

Package List

* SUSE Linux Enterprise Micro for Rancher 5.4 (aarch64 s390x x86_64)

* krb5-1.19.2-150400.3.18.1

* krb5-debugsource-1.19.2-150400.3.18.1

* krb5-debuginfo-1.19.2-150400.3.18.1

* SUSE Linux Enterprise Micro 5.4 (aarch64 s390x x86_64)

* krb5-1.19.2-150400.3.18.1

* krb5-debugsource-1.19.2-150400.3.18.1

* krb5-debuginfo-1.19.2-150400.3.18.1

* openSUSE Leap 15.4 (aarch64 ppc64le s390x x86_64 i586)

* krb5-devel-1.19.2-150400.3.18.1

* krb5-mini-debugsource-1.19.2-150400.3.18.1

* krb5-client-debuginfo-1.19.2-150400.3.18.1

* krb5-client-1.19.2-150400.3.18.1

* krb5-plugin-preauth-pkinit-1.19.2-150400.3.18.1

* krb5-plugin-preauth-spake-debuginfo-1.19.2-150400.3.18.1

* krb5-mini-debuginfo-1.19.2-150400.3.18.1

* krb5-plugin-preauth-spake-1.19.2-150400.3.18.1

* krb5-plugin-kdb-ldap-1.19.2-150400.3.18.1

* krb5-debuginfo-1.19.2-150400.3.18.1

* krb5-mini-1.19.2-150400.3.18.1

* krb5-plugin-preauth-pkinit-debuginfo-1.19.2-150400.3.18.1

* krb5-mini-devel-1.19.2-150400.3.18.1

* krb5-1.19.2-150400.3.18.1

*...

Read the Full Advisory

References

* bsc#1241219

## References:

* https://www.suse.com/security/cve/CVE-2025-3576.html

* https://bugzilla.suse.com/show_bug.cgi?id=1241219

Announcement ID: SUSE-SU-2025:3729-1
Release Date: 2025-10-22T13:19:36Z
Affected Products: * openSUSE Leap 15.4 * SUSE Linux Enterprise Micro 5.3 * SUSE Linux Enterprise Micro 5.4 * SUSE Linux Enterprise Micro for Rancher 5.3 * SUSE Linux Enterprise Micro for Rancher 5.4

Topics%20covered

Topics Covered

security advisory moderate authentication krb5 deny service OpenSUSE

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