<div class="container">
<h1>Security update for krb5</h1>
<table class="table table-striped table-bordered">
<tbody>
<tr>
<th>Announcement ID:</th>
<td>SUSE-SU-2025:03227-1</td>
</tr>
<tr>
<th>Release Date:</th>
<td>2025-09-15T12:33:26Z</td>
</tr>
<tr>
<th>Rating:</th>
<td>moderate</td>
</tr>
<tr>
<th>References:</th>
<td>
<ul>
<li style="display: inline;">
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1241219">bsc#1241219</a>
</li>
</ul>
</td>
</tr>
<tr>
<th>
Cross-References:
</th>
<td>
<ul>
<li style="display: inline;">
<a href="https://www.suse.com/security/cve/CVE-2025-3576.html">CVE-2025-3576</a>
</li>
</ul>
</td>
</tr>
<tr>
<th>CVSS scores:</th>
<td>
<ul class="list-group">
<li class="list-group-item">
<span class="cvss-reference">CVE-2025-3576</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">8.2</span>
<span class="cvss-vector">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</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2025-3576</span>
<span class="cvss-source">
(
SUSE
):
</span>
<span class="cvss-score">5.9</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N</span>
</li>
<li class="list-group-item">
<span class="cvss-reference">CVE-2025-3576</span>
<span class="cvss-source">
(
NVD
):
</span>
<span class="cvss-score">5.9</span>
<span class="cvss-vector">CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N</span>
</li>
</ul>
</td>
</tr>
<tr>
<th>Affected Products:</th>
<td>
<ul class="list-group">
<li class="list-group-item">openSUSE Leap 15.3</li>
<li class="list-group-item">SUSE Linux Enterprise Micro 5.1</li>
<li class="list-group-item">SUSE Linux Enterprise Micro 5.2</li>
<li class="list-group-item">SUSE Linux Enterprise Micro for Rancher 5.2</li>
</ul>
</td>
</tr>
</tbody>
</table>
<p>An update that solves one vulnerability can now be installed.</p>
<h2>Description:</h2>
<p>This update for krb5 fixes the following issues:</p>
<ul>
<li>CVE-2025-3576: weakness in the MD5 checksum design allows for spoofing of GSSAPI-protected messages that are using
RC4-HMAC-MD5 (bsc#1241219).</li>
</ul>
<p>Krb5, as a very old protocol, supported quite a number of ciphers that are not longer up to current cryptographic
standards.</p>
<p>To avoid problems with those, SUSE has by default now disabled those alorithms.</p>
<p>The following algorithms have been removed from valid krb5 enctypes:</p>
<ul>
<li>des3-cbc-sha1</li>
<li>arcfour-hmac-md5</li>
</ul>
<p>To reenable those algorithms, you can use allow options in <code>krb5.conf</code>:</p>
<pre><code>[libdefaults]
allow_des3 = true
allow_rc4 = true
</code></pre>
<h2>Patch Instructions:</h2>
<p>
To install this SUSE update use the SUSE recommended
installation methods like YaST online_update or "zypper patch".<br/>
Alternatively you can run the command listed for your product:
</p>
<ul class="list-group">
<li class="list-group-item">
openSUSE Leap 15.3
<br/>
<code>zypper in -t patch SUSE-2025-3227=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Micro 5.1
<br/>
<code>zypper in -t patch SUSE-SUSE-MicroOS-5.1-2025-3227=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Micro 5.2
<br/>
<code>zypper in -t patch SUSE-SUSE-MicroOS-5.2-2025-3227=1</code>
</li>
<li class="list-group-item">
SUSE Linux Enterprise Micro for Rancher 5.2
<br/>
<code>zypper in -t patch SUSE-SUSE-MicroOS-5.2-2025-3227=1</code>
</li>
</ul>
<h2>Package List:</h2>
<ul>
<li>
openSUSE Leap 15.3 (aarch64 ppc64le s390x x86_64 i586)
<ul>
<li>krb5-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-plugin-preauth-spake-1.19.2-150300.25.1</li>
<li>krb5-plugin-preauth-pkinit-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-plugin-preauth-spake-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-mini-1.19.2-150300.25.1</li>
<li>krb5-1.19.2-150300.25.1</li>
<li>krb5-plugin-preauth-otp-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-server-1.19.2-150300.25.1</li>
<li>krb5-client-1.19.2-150300.25.1</li>
<li>krb5-client-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-devel-1.19.2-150300.25.1</li>
<li>krb5-mini-devel-1.19.2-150300.25.1</li>
<li>krb5-plugin-preauth-pkinit-1.19.2-150300.25.1</li>
<li>krb5-plugin-preauth-otp-1.19.2-150300.25.1</li>
<li>krb5-mini-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-debugsource-1.19.2-150300.25.1</li>
<li>krb5-server-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-plugin-kdb-ldap-1.19.2-150300.25.1</li>
<li>krb5-plugin-kdb-ldap-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-mini-debugsource-1.19.2-150300.25.1</li>
</ul>
</li>
<li>
openSUSE Leap 15.3 (x86_64)
<ul>
<li>krb5-devel-32bit-1.19.2-150300.25.1</li>
<li>krb5-32bit-1.19.2-150300.25.1</li>
<li>krb5-32bit-debuginfo-1.19.2-150300.25.1</li>
</ul>
</li>
<li>
openSUSE Leap 15.3 (aarch64_ilp32)
<ul>
<li>krb5-64bit-1.19.2-150300.25.1</li>
<li>krb5-devel-64bit-1.19.2-150300.25.1</li>
<li>krb5-64bit-debuginfo-1.19.2-150300.25.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Micro 5.1 (aarch64 s390x x86_64)
<ul>
<li>krb5-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-1.19.2-150300.25.1</li>
<li>krb5-debugsource-1.19.2-150300.25.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Micro 5.2 (aarch64 s390x x86_64)
<ul>
<li>krb5-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-1.19.2-150300.25.1</li>
<li>krb5-debugsource-1.19.2-150300.25.1</li>
</ul>
</li>
<li>
SUSE Linux Enterprise Micro for Rancher 5.2 (aarch64 s390x x86_64)
<ul>
<li>krb5-debuginfo-1.19.2-150300.25.1</li>
<li>krb5-1.19.2-150300.25.1</li>
<li>krb5-debugsource-1.19.2-150300.25.1</li>
</ul>
</li>
</ul>
<h2>References:</h2>
<ul>
<li>
<a href="https://www.suse.com/security/cve/CVE-2025-3576.html">https://www.suse.com/security/cve/CVE-2025-3576.html</a>
</li>
<li>
<a href="https://bugzilla.suse.com/show_bug.cgi?id=1241219">https://bugzilla.suse.com/show_bug.cgi?id=1241219</a>
</li>
</ul>
</div>