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CVE-2016-8743

Published: 22 December 2016

Apache HTTP Server, in all releases prior to 2.2.32 and 2.4.25, was liberal in the whitespace accepted from requests and sent in response lines and headers. Accepting these different behaviors represented a security concern when httpd participates in any chain of proxies or interacts with back-end application servers, either through mod_proxy or using conventional CGI mechanisms, and may result in request smuggling, response splitting and cache pollution.

Notes

AuthorNote
ratliff
Notes from Debian "The fix is not fully backwards compatible so
upstream have created a new option to control this behaviour.
Affects: 2.2.0 to 2.4.23."
mdeslaur
This fix no longer allows underscores in host names. Debian
added a patch to restore the behaviour:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=851357
http://mail-archives.apache.org/mod_mbox/httpd-dev/201702.mbox/%3C20170202125319.GA15948%40redhat.com%3E

The new configuration option doesn't entirely preserve
backwards compatibility:
https://bz.apache.org/bugzilla/show_bug.cgi?id=60783

Priority

Medium

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package Release Status
apache2
Launchpad, Ubuntu, Debian
precise Ignored
(end of life)
upstream
Released (2.4.25-1)
xenial
Released (2.4.18-2ubuntu3.2)
yakkety
Released (2.4.18-2ubuntu4.1)
zesty Not vulnerable
(2.4.25-3ubuntu2)
trusty
Released (2.4.7-1ubuntu4.15)
Patches:
upstream: https://svn.apache.org/r1668879 (2.4 bp, trusty)
upstream: https://svn.apache.org/r1743516 (2.4 bp)
upstream: https://svn.apache.org/r1773801 (2.4 bp)
upstream: https://svn.apache.org/r1772678 (2.4)
upstream: https://svn.apache.org/r1773802 (2.4)
upstream: https://svn.apache.org/r1773803 (2.4)
upstream: https://svn.apache.org/r1773995 (2.4)
upstream: https://svn.apache.org/r1774429 (2.4)
upstream: https://svn.apache.org/r1778052 (2.4)

Severity score breakdown

Parameter Value
Base score 7.5
Attack vector Network
Attack complexity Low
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N