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<section id="cyrus-imap-3-4-8-release-notes">
<h1>Cyrus IMAP 3.4.8 Release Notes<a class="headerlink" href="#cyrus-imap-3-4-8-release-notes" title="Permalink to this heading"></a></h1>
<p>Download from GitHub:</p>
<ul class="simple">
<li><p><a class="reference external" href="https://github.com/cyrusimap/cyrus-imapd/releases/download/cyrus-imapd-3.4.8/cyrus-imapd-3.4.8.tar.gz">https://github.com/cyrusimap/cyrus-imapd/releases/download/cyrus-imapd-3.4.8/cyrus-imapd-3.4.8.tar.gz</a></p></li>
<li><p><a class="reference external" href="https://github.com/cyrusimap/cyrus-imapd/releases/download/cyrus-imapd-3.4.8/cyrus-imapd-3.4.8.tar.gz.sig">https://github.com/cyrusimap/cyrus-imapd/releases/download/cyrus-imapd-3.4.8/cyrus-imapd-3.4.8.tar.gz.sig</a></p></li>
</ul>
<section id="changes-since-3-4-7">
<span id="relnotes-3-4-8-changes"></span><h2>Changes since 3.4.7<a class="headerlink" href="#changes-since-3-4-7" title="Permalink to this heading"></a></h2>
<section id="security-fixes">
<h3>Security fixes<a class="headerlink" href="#security-fixes" title="Permalink to this heading"></a></h3>
<ul>
<li><p>Fixed <a class="reference external" href="https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-34055">CVE-2024-34055</a>:
Cyrus-IMAP through 3.8.2 and 3.10.0-beta2 allow authenticated attackers
to cause unbounded memory allocation by sending many LITERALs in a
single command.</p>
<p>The IMAP protocol allows for command arguments to be LITERALs of
negotiated length, and for these the server allocates memory to
receive the content before instructing the client to proceed. The
allocated memory is released when the whole command has been received
and processed.</p>
<p>The IMAP protocol has a number commands that specify an unlimited
number of arguments, for example SEARCH. Each of these arguments can
be a LITERAL, for which memory will be allocated and not released
until the entire command has been received and processed. This can run
a server out of memory, with varying consequences depending on the
server's OOM policy.</p>
<p>Discovered by Damian Poddebniak.</p>
<p>Two limits, with corresponding <a class="reference internal" href="../../../../reference/manpages/configs/imapd.conf.html#std-cyrusman-imapd.conf-5">imapd.conf(5)</a> options, have
been added to address this:</p>
<ul class="simple">
<li><p><code class="docutils literal notranslate"><span class="pre">maxargssize</span></code> (default: unlimited): limits the overall length of a
single IMAP command. Deployments should configure this to a size that
suits their system resources and client usage patterns</p></li>
<li><p><code class="docutils literal notranslate"><span class="pre">maxliteral</span></code> (default: 128K): limits the length of individual IMAP
LITERALs</p></li>
</ul>
<p>Connections sending commands that would exceed these limits will see the
command fail, or the connection closed, depending on the specific context.
The error message will contain the <code class="docutils literal notranslate"><span class="pre">[TOOBIG]</span></code> response code.</p>
<p>These limits may be set small without affecting message uploads, as the
APPEND command's message literal is limited by <code class="docutils literal notranslate"><span class="pre">maxmessagesize</span></code>, not by
these new options.</p>
</li>
</ul>
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