CVE-2016-8743

Publication date 22 December 2016

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

7.5 · High

Score breakdown

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.

Read the notes from the security team

Status

Package Ubuntu Release Status
apache2 17.04 zesty
Not affected
16.10 yakkety
Fixed 2.4.18-2ubuntu4.1
16.04 LTS xenial
Fixed 2.4.18-2ubuntu3.2
14.04 LTS trusty
Fixed 2.4.7-1ubuntu4.15
12.04 LTS precise Ignored end of life

Notes

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

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
apache2

Severity score breakdown

Parameter Value
Base score 7.5 · High
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