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OpenAdvisories
Medium · 6.8 CVE-2020-11077 EUVD-2020-0445GHSA-w64w-qqph-5gxm

HTTP Smuggling via Transfer-Encoding Header in Puma

Published May 22, 2020 · Updated Aug 4, 2024 · Assigned by GitHub_M

Description

In Puma (RubyGem) before 4.3.5 and 3.12.6, a client could smuggle a request through a proxy, causing the proxy to send a response back to another unknown client. If the proxy uses persistent connections and the client adds another request in via HTTP pipelining, the proxy may mistake it as the first request's body. Puma, however, would see it as two requests, and when processing the second request, send back a response that the proxy does not expect. If the proxy has reused the persistent connection to Puma to send another request for a different client, the second response from the first client will be sent to the second client. This is a similar but different vulnerability from CVE-2020-11076. The problem has been fixed in Puma 3.12.6 and Puma 4.3.5.

Affected products

VendorProductAffectedFixed
puma puma < 3.12.6, >= 4.0.0, < 4.3.5 —

Fixed in Linux distributions

Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.

ReleasePackageFixed inAdvisory
Debian 14 puma 4.3.6-1 —
Debian 13 puma 4.3.6-1 —
Debian 12 puma 4.3.6-1 —
Debian 9 puma 3.6.0-1+deb9u1 DLA-2398-1
ReleasePackageFixed inAdvisory
Ubuntu Pro 22.04 LTS puma 5.5.2-2ubuntu2+esm1 USN-6682-1
Ubuntu Pro 20.04 LTS puma 3.12.4-1ubuntu2+esm1 USN-6682-1
ReleasePackageFixed inAdvisory
SLES 15 SP2 rmt-server 2.6.5-3.3.1 SUSE-SU-2020:3036-1
SLES 15 SP2 rubygem-puma 4.3.5-3.3.1 SUSE-SU-2020:1919-1
SLES 15 SP1 rmt-server 2.6.5-3.18.1 SUSE-SU-2020:3160-1
SLES 15 SP1 rubygem-puma 4.3.5-3.3.1 SUSE-SU-2020:1919-1
SLES 15 rmt-server 2.6.5-3.34.1 SUSE-SU-2020:3147-1
SLES 15 rubygem-puma 4.3.5-3.3.1 SUSE-SU-2020:1919-1
Show 7 more (older releases, extended support, other products)
ReleasePackageFixed inAdvisory
SLES for SAP 15 rmt-server 2.6.5-3.34.1 SUSE-SU-2020:3147-1
SLE HPC 15 rmt-server 2.6.5-3.34.1 SUSE-SU-2020:3147-1
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SUSE HPE Helion OpenStack 8 venv-openstack-trove 8.0.2~dev2-11.26.1 SUSE-SU-2020:1901-1
ReleasePackageFixed inAdvisory
openSUSE Leap 15.2 rmt-server 2.6.5-lp152.2.3.1 openSUSE-SU-2020:1993-1
openSUSE Leap 15.2 rubygem-puma 4.3.5-lp152.4.3.1 openSUSE-SU-2020:1001-1
openSUSE Leap 15.1 rmt-server 2.6.5-lp151.2.18.2 openSUSE-SU-2020:2000-1
openSUSE Leap 15.1 rubygem-puma 4.3.5-lp151.3.3.1 openSUSE-SU-2020:0990-1

Affected packages

EcosystemPackageAffectedFixedRecord
RubyGems puma < 3.12.6 3.12.6 GHSA-w64w-qqph-5gxm
RubyGems puma >= 4.0.0, < 4.3.5 4.3.5 GHSA-w64w-qqph-5gxm

Advisories 13

References