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Debian: Security Advisory for haproxy (DSA-4960-1)
Information
Severity
Severity
Family
Family
CVSSv2 Base
CVSSv2 Base
CVSSv2 Vector
CVSSv2 Vector
Solution Type
Solution Type
Created
Created
Modified
Modified
Summary
The remote host is missing an update for the 'haproxy' package(s) announced via the DSA-4960-1 advisory.
Insight
Insight
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
Affected Software
Affected Software
'haproxy' package(s) on Debian Linux.
Detection Method
Detection Method
Checks if a vulnerable package version is present on the target host.
Solution
Solution
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.