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CVE-2023-23583: microcode_ctl
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EL9
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CVE-2023-4911: glibc
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<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24"><path d="M10 20H6V4h7v5h5v3.1l2-2V8l-6-6H6c-1.1 0-2 .9-2 2v16c0 1.1.9 2 2 2h4zm10.2-7c.1 0 .3.1.4.2l1.3 1.3c.2.2.2.6 0 .8l-1 1-2.1-2.1 1-1c.1-.1.2-.2.4-.2m0 3.9L14.1 23H12v-2.1l6.1-6.1z"/></svg>
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<h1 id="cve-2023-23583-microcode_ctl">CVE-2023-23583: microcode_ctl<a class="headerlink" href="#cve-2023-23583-microcode_ctl" title="Permanent link">¶</a></h1>
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<h2 id="title">Title<a class="headerlink" href="#title" title="Permanent link">¶</a></h2>
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<p>CVE-2023-23583: microcode_ctl: Intel CPUs: execution of MOVSB instructions with redundant REX prefix leads to unintended system behavior</p>
|
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<h2 id="summary">Summary<a class="headerlink" href="#summary" title="Permanent link">¶</a></h2>
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<p>As described by <a href="https://www.openwall.com/lists/oss-security/2023/11/14/4">Intel</a>:</p>
|
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<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>and by <a href="https://access.redhat.com/security/cve/CVE-2023-23583">Red Hat</a>:</p>
|
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<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>
|
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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>
|
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<p>Public disclosure date: November 14, 2023</p>
|
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<h2 id="el9">EL9<a class="headerlink" href="#el9" title="Permanent link">¶</a></h2>
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<ul>
|
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<li>Fixed in version: <code>4:20231114-1.el9_2.security</code> available November 15, 2023</li>
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<h2 id="el8">EL8<a class="headerlink" href="#el8" title="Permanent link">¶</a></h2>
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<ul>
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<li>Fixed in version <code>4:20230808-2.20231009.1.el8.security</code> available November 19, 2023</li>
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</ul>
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<p>Please refer to our <a href="../../packages/microcode_ctl/">override package of microcode_ctl</a>.</p>
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