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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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