Bug 1995104 (CVE-2021-39240) - CVE-2021-39240 haproxy: does not ensure that the scheme and path portions of a URI have the expected characters
Summary: CVE-2021-39240 haproxy: does not ensure that the scheme and path portions of ...
Keywords:
Status: CLOSED ERRATA
Alias: CVE-2021-39240
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1995105 1998196 2001963 2002703 2003162 2019913
Blocks: 1993521
TreeView+ depends on / blocked
 
Reported: 2021-08-18 13:12 UTC by Guilherme de Almeida Suckevicz
Modified: 2022-05-17 09:53 UTC (History)
13 users (show)

Fixed In Version: haproxy 2.4.3
Doc Type: If docs needed, set a value
Doc Text:
A flaw was found in haproxy. An input validation flaw when processing HTTP/2 requests causes haproxy to not ensure that the scheme and path portions of a URI have the expected characters. This may cause specially crafted input to bypass implemented security restrictions. The highest threat from this vulnerability is confidentiality.
Clone Of:
Environment:
Last Closed: 2021-11-10 20:57:48 UTC
Embargoed:

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Links
System ID Private Priority Status Summary Last Updated
Red Hat Product Errata RHSA-2021:4118 0 None None None 2021-11-10 20:49:35 UTC
Red Hat Product Errata RHSA-2021:5208 0 None None None 2022-01-05 15:44:14 UTC

Description Guilherme de Almeida Suckevicz 2021-08-18 13:12:53 UTC 
An issue was discovered in HAProxy 2.2 before 2.2.16, 2.3 before 2.3.13, and 2.4 before 2.4.3. It does not ensure that the scheme and path portions of a URI have the expected characters. For example, the authority field (as observed on a target HTTP/2 server) might differ from what the routing rules were intended to achieve.

Reference:
https://www.mail-archive.com/haproxy@formilux.org/msg41041.html

Upstream patches:
https://git.haproxy.org/?p=haproxy.git;a=commit;h=a495e0d94876c9d39763db319f609351907a31e8
https://git.haproxy.org/?p=haproxy.git;a=commit;h=4b8852c70d8c4b7e225e24eb58258a15eb54c26e
Comment 1 Guilherme de Almeida Suckevicz 2021-08-18 13:13:11 UTC 
Created haproxy tracking bugs for this issue:

Affects: fedora-all [bug 1995105]
Comment 4 errata-xmlrpc 2021-11-10 20:49:34 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.9

Via RHSA-2021:4118 https://access.redhat.com/errata/RHSA-2021:4118
Comment 5 Product Security DevOps Team 2021-11-10 20:57:45 UTC 
This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2021-39240
Comment 6 errata-xmlrpc 2022-01-05 15:44:12 UTC 
This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.8

Via RHSA-2021:5208 https://access.redhat.com/errata/RHSA-2021:5208
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