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Debian Security Advisory DSA-4960-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
August 17, 2021                       https://www.debian.org/security/faq
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Package        : haproxy
CVE ID         : not yet assigned

Several vulnerabilities were discovered in HAProxy, a fast and reliable
load balancing reverse proxy, which can result in HTTP request
smuggling. By carefully crafting HTTP/2 requests, it is possible to
smuggle another HTTP request to the backend selected by the HTTP/2
request. With certain configurations, it allows an attacker to send an
HTTP request to a backend, circumventing the backend selection logic.

Known workarounds are to disable HTTP/2 and set
"tune.h2.max-concurrent-streams" to 0 in the "global" section.

    global
        tune.h2.max-concurrent-streams 0

For the stable distribution (bullseye), these problems have been fixed in
version 2.2.9-2+deb11u1.

We recommend that you upgrade your haproxy packages.

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

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

Mailing list: debian-security-announce@lists.debian.org
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