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CVE-2024-6409: openssh
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CVE-2023-23583: microcode_ctl
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</a>
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CVE-2023-4911: glibc
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CVE-2024-1086: kernel
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</a>
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CVE-2024-2961: glibc
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CVE-2024-6387: openssh
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CVE-2024-6409: openssh
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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-2024-6409-openssh">CVE-2024-6409: openssh<a class="headerlink" href="#cve-2024-6409-openssh" 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-2024-6409: OpenSSH: Possible remote code execution in privsep child due to a race condition in signal handling</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 <a href="https://www.openwall.com/lists/oss-security/2024/07/08/2">discovered by Solar Designer (CIQ/Rocky Linux)</a>:</p>
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<p>OpenSSH versions 8.7 and 8.8 and the corresponding portable releases call <code>cleanup_exit()</code> from <code>grace_alarm_handler()</code> when running in the privsep child process. <code>cleanup_exit()</code> was not meant to be called from a signal handler and may call other async-signal-unsafe functions. The current understanding is that in those upstream versions <code>cleanup_exit()</code> would not actually call async-signal-unsafe functions under those conditions, but with downstream distribution patches it sometimes does. Specifically, openssh-7.6p1-audit.patch found in Red Hat's package of OpenSSH adds code to <code>cleanup_exit()</code> that exposes the issue. Relevantly, this patch is found in EL 9, where the package is based on OpenSSH 8.7p1.</p>
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<p>This is an EL9-specific issue similar to <a href="../CVE-2024-6387/">CVE-2024-6387 regreSSHion</a>.</p>
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<p>Public disclosure date: July 8, 2024</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>8.7p1-38.1.el9_4.security.0.7</code> available July 8, 2024</li>
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</ul>
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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>Unaffected</li>
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</ul>
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<h2 id="mitigation">Mitigation<a class="headerlink" href="#mitigation" title="Permanent link">¶</a></h2>
|
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<p>Set <code>LoginGraceTime 0</code> in <code>/etc/ssh/sshd_config</code> and do a <code>systemctl restart sshd</code>.</p>
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<p>A drawback of this mitigation is that it will make the SSH server more susceptible to denial of service attacks.</p>
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<span class="git-revision-date-localized-plugin git-revision-date-localized-plugin-date">July 8, 2024</span>
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