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openSUSE: Moderate Spoofing Advisory for krb5 CVE-2025-3576

opensuse
Calendar Grey September 18, 2025
Dist Opensuse Esm H88
Critical patch for krb5 targets spoofing threats in openSUSE environments, improving encryption protocols and overall security measures.
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 a 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 algorithms.

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

Topics%20covered

Topics Covered

security advisory moderate krb5 GSSAPI spoofing 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:

* openSUSE Leap 15.5

zypper in -t patch SUSE-2025-3270=1

* SUSE Linux Enterprise Micro 5.5

zypper in -t patch SUSE-SLE-Micro-5.5-2025-3270=1

Package List

* openSUSE Leap 15.5 (aarch64 ppc64le s390x x86_64 i586)

* krb5-plugin-preauth-pkinit-1.20.1-150500.3.17.1

* krb5-1.20.1-150500.3.17.1

* krb5-plugin-kdb-ldap-debuginfo-1.20.1-150500.3.17.1

* krb5-plugin-preauth-spake-debuginfo-1.20.1-150500.3.17.1

* krb5-server-debuginfo-1.20.1-150500.3.17.1

* krb5-devel-1.20.1-150500.3.17.1

* krb5-mini-devel-1.20.1-150500.3.17.1

* krb5-mini-debuginfo-1.20.1-150500.3.17.1

* krb5-client-debuginfo-1.20.1-150500.3.17.1

* krb5-plugin-preauth-otp-debuginfo-1.20.1-150500.3.17.1

* krb5-server-1.20.1-150500.3.17.1

* krb5-client-1.20.1-150500.3.17.1

* krb5-debugsource-1.20.1-150500.3.17.1

* krb5-debuginfo-1.20.1-150500.3.17.1

* krb5-plugin-preauth-spake-1.20.1-150500.3.17.1

* krb5-plugin-preauth-pkinit-debuginfo-1.20.1-150500.3.17.1

* krb5-mini-1.20.1-150500.3.17.1

* krb5-plugin-kdb-ldap-1.20.1-150500.3.17.1

* krb5-plugin-preauth-otp-1.20.1-150500.3.17.1

* krb5-mini-debugsource-1.20.1-150500.3.17.1

* openSUSE Leap 15.5 (x86_64)

* krb5-32bit-debuginfo-1.20.1-150500.3.17.1

*...

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-2025:03270-1
Release Date: 2025-09-18T11:18:09Z
Affected Products: * openSUSE Leap 15.5 * SUSE Linux Enterprise Micro 5.5

Topics%20covered

Topics Covered

security advisory moderate krb5 GSSAPI spoofing OpenSUSE

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