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<vuln vid="13d83980-9f18-11ee-8e38-002590c1f29c"> | ||
<topic>FreeBSD -- Prefix Truncation Attack in the SSH protocol</topic> | ||
<affects> | ||
<package> | ||
<name>FreeBSD</name> | ||
<range><ge>14.0</ge><lt>14.0_4</lt></range> | ||
<range><ge>13.2</ge><lt>13.2_9</lt></range> | ||
</package> | ||
</affects> | ||
<description> | ||
<body xmlns="http://www.w3.org/1999/xhtml"> | ||
<h1>Problem Description:</h1> | ||
<p>The SSH protocol executes an initial handshake between the | ||
server and the client. This protocol handshake includes the | ||
possibility of several extensions allowing different options to be | ||
selected. Validation of the packets in the handshake is done through | ||
sequence numbers.</p> | ||
<h1>Impact:</h1> | ||
<p>A man in the middle attacker can silently manipulate handshake | ||
messages to truncate extension negotiation messages potentially | ||
leading to less secure client authentication algorithms or deactivating | ||
keystroke timing attack countermeasures.</p> | ||
</body> | ||
</description> | ||
<references> | ||
<cvename>CVE-2023-48795</cvename> | ||
<freebsdsa>SA-23:19.openssh</freebsdsa> | ||
</references> | ||
<dates> | ||
<discovery>2023-12-19</discovery> | ||
<entry>2024-01-02</entry> | ||
</dates> | ||
</vuln> |