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<span class="md-ellipsis">
CVE-2023-23583: microcode_ctl: Intel CPUs: execution of MOVSB instructions with redundant REX prefix leads to unintended system behavior
CVE-2023-23583: microcode_ctl
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CVE-2023-4911: glibc: Looney Tunables: buffer overflow in ld.so leading to privilege escalation
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<h3 id="override-packages-currently-only-for-el9">Override packages (currently only for EL9)<a class="headerlink" href="#override-packages-currently-only-for-el9" title="Permanent link">&para;</a></h3>
<ul>
<li><a href="packages/glibc/">glibc</a> (adds many security-hardening changes originating from Owl and ALT Linux on top of EL package)</li>
<li><a href="packages/microcode_ctl/">microcode_ctl</a> (updates Intel CPU microcode to microcode-20231114, which fixes CVE-2023-23583)</li>
<li><a href="packages/microcode_ctl/">microcode_ctl</a> (updates Intel CPU microcode to microcode-20231114, which fixes <a href="issues/CVE-2023-23583/">CVE-2023-23583</a>)</li>
<li><a href="packages/openssh/">openssh</a> (fewer shared libraries exposed in sshd processes while otherwise fully matching EL package's functionality)</li>
</ul>
<p>The changes are described in more detail on the per-package wiki pages linked above, as well as in the package changelogs.

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<title>CVE-2023-23583: microcode_ctl: Intel CPUs: execution of MOVSB instructions with redundant REX prefix leads to unintended system behavior - SIG/Security Wiki</title>
<title>CVE-2023-23583: microcode_ctl - SIG/Security Wiki</title>
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CVE-2023-23583: microcode_ctl: Intel CPUs: execution of MOVSB instructions with redundant REX prefix leads to unintended system behavior
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CVE-2023-23583: microcode_ctl: Intel CPUs: execution of MOVSB instructions with redundant REX prefix leads to unintended system behavior
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<ul class="md-nav__list" data-md-component="toc" data-md-scrollfix>
<li class="md-nav__item">
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<h1 id="cve-2023-23583-microcode_ctl-intel-cpus-execution-of-movsb-instructions-with-redundant-rex-prefix-leads-to-unintended-system-behavior">CVE-2023-23583: microcode_ctl: Intel CPUs: execution of MOVSB instructions with redundant REX prefix leads to unintended system behavior<a class="headerlink" href="#cve-2023-23583-microcode_ctl-intel-cpus-execution-of-movsb-instructions-with-redundant-rex-prefix-leads-to-unintended-system-behavior" title="Permanent link">&para;</a></h1>
<h1 id="cve-2023-23583-microcode_ctl">CVE-2023-23583: microcode_ctl<a class="headerlink" href="#cve-2023-23583-microcode_ctl" title="Permanent link">&para;</a></h1>
<h2 id="title">Title<a class="headerlink" href="#title" title="Permanent link">&para;</a></h2>
<p>CVE-2023-23583: microcode_ctl: Intel CPUs: execution of MOVSB instructions with redundant REX prefix leads to unintended system behavior</p>
<h2 id="summary">Summary<a class="headerlink" href="#summary" title="Permanent link">&para;</a></h2>
<p>As described by <a href="https://www.openwall.com/lists/oss-security/2023/11/14/4">Intel</a>:</p>
<p>Under certain microarchitectural conditions, Intel has identified cases where execution of an instruction (REP MOVSB) encoded with a redundant REX prefix may result in unpredictable system behavior resulting in a system crash/hang, or, in some limited scenarios, may allow escalation of privilege from CPL3 to CPL0.</p>
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<p>More detail is available via these <a href="https://www.openwall.com/lists/oss-security/2023/11/14/7">links to Intel's website</a> and in the public disclosure by <a href="https://lock.cmpxchg8b.com/reptar.html">Tavis Ormandy</a> from <a href="https://cloud.google.com/blog/products/identity-security/google-researchers-discover-reptar-a-new-cpu-vulnerability">Google</a>.</p>
<p>Public disclosure date: November 14, 2023</p>
<h2 id="el9">EL9<a class="headerlink" href="#el9" title="Permanent link">&para;</a></h2>
<p>Fixed in version: <code>4:20231114-1.el9_2.security</code> available November 15, 2023</p>
<ul>
<li>Fixed in version: <code>4:20231114-1.el9_2.security</code> available November 15, 2023</li>
</ul>
<p>Please refer to our <a href="/packages/microcode_ctl.md">override package of microcode_ctl</a>.</p>
<h2 id="el8">EL8<a class="headerlink" href="#el8" title="Permanent link">&para;</a></h2>
<p>Not fixed yet, will fix.</p>
<ul>
<li>Not fixed yet, will fix.</li>
</ul>
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<title>CVE-2023-4911: glibc: Looney Tunables: buffer overflow in ld.so leading to privilege escalation - SIG/Security Wiki</title>
<title>CVE-2023-4911: glibc - SIG/Security Wiki</title>
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<h1 id="cve-2023-4911-glibc-looney-tunables-buffer-overflow-in-ldso-leading-to-privilege-escalation">CVE-2023-4911: glibc: Looney Tunables: buffer overflow in ld.so leading to privilege escalation<a class="headerlink" href="#cve-2023-4911-glibc-looney-tunables-buffer-overflow-in-ldso-leading-to-privilege-escalation" title="Permanent link">&para;</a></h1>
<h1 id="cve-2023-4911-glibc">CVE-2023-4911: glibc<a class="headerlink" href="#cve-2023-4911-glibc" title="Permanent link">&para;</a></h1>
<h2 id="title">Title<a class="headerlink" href="#title" title="Permanent link">&para;</a></h2>
<p>CVE-2023-4911: glibc: Looney Tunables: buffer overflow in ld.so leading to privilege escalation</p>
<h2 id="summary">Summary<a class="headerlink" href="#summary" title="Permanent link">&para;</a></h2>
<p>As described by <a href="https://access.redhat.com/security/cve/CVE-2023-4911">Red Hat</a> and in <a href="https://www.cve.org/CVERecord?id=CVE-2023-4911">CVE-2023-4911</a>:</p>
<p>A buffer overflow was discovered in the GNU C Library's dynamic loader ld.so while processing the <code>GLIBC_TUNABLES</code> environment variable. This issue could allow a local attacker to use maliciously crafted <code>GLIBC_TUNABLES</code> environment variables when launching binaries with SUID permission to execute code with elevated privileges.</p>
<p>More detail is available in the <a href="https://www.openwall.com/lists/oss-security/2023/10/03/2">public disclosure</a> by <a href="https://blog.qualys.com/vulnerabilities-threat-research/2023/10/03/cve-2023-4911-looney-tunables-local-privilege-escalation-in-the-glibcs-ld-so">Qualys</a>, the team who discovered the issue.</p>
<p>Public disclosure date: October 3, 2023</p>
<h2 id="el9">EL9<a class="headerlink" href="#el9" title="Permanent link">&para;</a></h2>
<p>Mitigated in version: <code>2.34-60.el9_2.security.0.2</code> available October 3, 2023
Fixed in version: <code>glibc-2.34-60.el9_2.7</code> available October 5, 2023</p>
<p>Besides the upstream fix, we also retained the mitigation in the <a href="packages/glibc.md">Security SIG package of glibc</a>.</p>
<ul>
<li>Mitigated in version: <code>2.34-60.el9_2.security.0.2</code> available October 3, 2023</li>
<li>Fixed in version: <code>glibc-2.34-60.el9_2.7</code> available October 5, 2023</li>
</ul>
<p>Besides the upstream fix, we also retained the mitigation in our <a href="/packages/glibc.md">override package of glibc</a>.</p>
<h2 id="el8">EL8<a class="headerlink" href="#el8" title="Permanent link">&para;</a></h2>
<p>Fixed in version: <code>glibc-0:2.28-225.el8_8.6</code> available October 5, 2023
Errata: <a href="https://errata.rockylinux.org/RLSA-2023:5455">RLSA-2023:5455</a> issued October 7, 2023</p>
<ul>
<li>Fixed in version: <code>glibc-0:2.28-225.el8_8.6</code> available October 5, 2023</li>
<li>Errata: <a href="https://errata.rockylinux.org/RLSA-2023:5455">RLSA-2023:5455</a> issued October 7, 2023</li>
</ul>
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