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Debian LTS Advisory DLA-3638-1                debian-lts@lists.debian.org
https://www.debian.org/lts/security/                         Anton Gladky
October 29, 2023                              https://wiki.debian.org/LTS
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Package        : h2o
Version        : 2.2.5+dfsg2-2+deb10u2
CVE ID         : CVE-2023-44487
Debian Bug     : 1054232

A vulnerability has been identified in h2o, a high-performance web server
with support for HTTP/2.

A security vulnerability CVE-2023-44487 was discovered that could potentially
be exploited to disrupt server operation.

The vulnerability in the h2o HTTP/2 server was related to the handling of
certain types of HTTP/2 requests. In certain scenarios, an attacker could
send a series of malicious requests, causing the server to process them
rapidly and exhaust system resources.

The applied upstream patch changes the ABI. Therefore, if your application
is built against any shared libraries of h2o, you need to rebuild it.
No Debian package is affected.

For Debian 10 buster, this problem has been fixed in version
2.2.5+dfsg2-2+deb10u2.

We recommend that you upgrade your h2o packages.

For the detailed security status of h2o please refer to
its security tracker page at:
https://security-tracker.debian.org/tracker/source-package/h2o

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://wiki.debian.org/LTS