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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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</code></pre></div>
<p>This isn't as secure as checking the package signature would be <em>if</em> you previously had our package signing public key, but on another distro you probably don't have that yet, so checking the digest against its copy obtained from this separate website is a best-effort measure.</p>
<p>Install the package with <code>rpm -U --nodeps</code>. The <code>--nodeps</code> option is needed to bypass the dependency check on our <code>rocky-release</code> package. In essense, you're manually confirming to <code>rpm</code> that you're installing on a compatible distro.</p>
<p>You'll normally install packages from the mirrors, which should just work. However, if there's any issue with the mirrors and you uncomment our <code>baseurl</code> line instead, then on non-Rocky you'll need to use <code>DNF_VAR_sigcontentdir=/pub/sig dnf</code> in place of simply <code>dnf</code>.</p>
<h2 id="packages">Packages<a class="headerlink" href="#packages" title="Permanent link">&para;</a></h2>
<h3 id="extra-packages-for-el8-and-el9">Extra packages (for EL8 and EL9)<a class="headerlink" href="#extra-packages-for-el8-and-el9" title="Permanent link">&para;</a></h3>
<ul>
@ -570,11 +687,12 @@
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<h3 id="extra-packages-currently-only-for-el9">Extra packages (currently only for EL9)<a class="headerlink" href="#extra-packages-currently-only-for-el9" title="Permanent link">&para;</a></h3>
<ul>
<li><a href="https://github.com/GrapheneOS/hardened_malloc">hardened_malloc</a> (Security-focused memory allocator providing the malloc API, and a script to preload it into existing program binaries)</li>
<li><a href="packages/hardened_malloc/">hardened_malloc</a> (Security-focused memory allocator providing the malloc API, and a script to preload it into existing program binaries)</li>
</ul>
<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/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.
@ -632,7 +750,7 @@ More packages/changes are planned, including override packages also for EL8.</p>
<small>
Last update:
<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">October 31, 2023</span>
<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">November 15, 2023</span>
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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>
<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>
<p>and by <a href="https://access.redhat.com/security/cve/CVE-2023-23583">Red Hat</a>:</p>
<p>A security vulnerability was found in some Intel processors. Execution of REP MOVSB instructions with a redundant REX prefix may result in execution continuing at an incorrect EIP address after a micro-architectural event occurs, potentially allowing privilege escalation, information disclosure and/or a denial of service via local access.</p>
<p>as well as in <a href="https://www.cve.org/CVERecord?id=CVE-2023-23583">CVE-2023-23583</a>.</p>
<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>
<h2 id="el8">EL8<a class="headerlink" href="#el8" title="Permanent link">&para;</a></h2>
<p>Not fixed yet, will fix.</p>
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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>
<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>
<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>
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<h1 id="override-package-microcode_ctl">Override package: microcode_ctl<a class="headerlink" href="#override-package-microcode_ctl" title="Permanent link">&para;</a></h1>
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<li>Version <code>4:20231114-1.el9_2.security</code></li>
<li>Based on <code>4:20230808-2</code></li>
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<h3 id="changes-summary">Changes summary<a class="headerlink" href="#changes-summary" title="Permanent link">&para;</a></h3>
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<li>Update Intel CPU microcode to microcode-20231114 (fixes <a href="https://www.openwall.com/lists/oss-security/2023/11/14/4">CVE-2023-23583</a>), temporarily dropping most documentation patches</li>
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<h3 id="change-log">Change log<a class="headerlink" href="#change-log" title="Permanent link">&para;</a></h3>
<div class="highlight"><pre><span></span><code>* Tue Nov 14 2023 Solar Designer &lt;solar@openwall.com&gt; - 4:20231114-1
- Update Intel CPU microcode to microcode-20231114 (fixes CVE-2023-23583),
temporarily dropping most documentation patches
</code></pre></div>
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@ -13,7 +13,7 @@
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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-2023-4911: glibc: Looney Tunables: buffer overflow in ld.so leading to privilege escalation
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<lastmod>2023-11-15</lastmod>
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<lastmod>2023-11-15</lastmod>
<changefreq>daily</changefreq>
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<url>
<loc>https://sig-security.rocky.page/issues/CVE-2023-4911/</loc>
<lastmod>2023-11-15</lastmod>
<changefreq>daily</changefreq>
</url>
<url>
<loc>https://sig-security.rocky.page/packages/glibc/</loc>
<lastmod>2023-11-15</lastmod>
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<lastmod>2023-11-15</lastmod>
<changefreq>daily</changefreq>
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