PublicDateAtUSN: 2021-08-16 08:15:00 UTC
Candidate: CVE-2021-33193
PublicDate: 2021-08-16 08:15:00 UTC
References:
 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-33193
 https://portswigger.net/research/http2
 https://ubuntu.com/security/notices/USN-5090-1
Description:
 A crafted method sent through HTTP/2 will bypass validation and be
 forwarded by mod_proxy, which can lead to request splitting or cache
 poisoning. This issue affects Apache HTTP Server 2.4.17 to 2.4.48.
Ubuntu-Description:
Notes:
 mdeslaur> commits for trunk and 2.4 don't match, needs investigation
 mdeslaur> commit for 2.4 is the one listed in the vulnerability report
 mdeslaur> as of 2021-08-26, no new version of apache contains the fix
Mitigation:
Bugs:
Priority: medium
Discovered-by: James Kettle
Assigned-to:
CVSS:
 nvd: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N [7.5 HIGH]


Patches_apache2:
 upstream: https://github.com/apache/httpd/commit/f990e5ecad40b100a8a5c7c1033c46044a9cb244 (trunk)
 upstream: https://github.com/apache/httpd/commit/ecebcc035ccd8d0e2984fe41420d9e944f456b3c (2.4)
upstream_apache2: released (2.4.48-4)
trusty_apache2: ignored (out of standard support)
trusty/esm_apache2: not-affected (code not present)
xenial_apache2: ignored (out of standard support)
esm-infra/xenial_apache2: not-affected (http2 disabled in xenial)
bionic_apache2: released (2.4.29-1ubuntu4.17)
focal_apache2: released (2.4.41-4ubuntu3.5)
hirsute_apache2: released (2.4.46-4ubuntu1.2)
impish_apache2: released (2.4.48-3.1ubuntu2)
jammy_apache2: released (2.4.48-3.1ubuntu2)
devel_apache2: released (2.4.48-3.1ubuntu2)