CVE-2016-8743 Other in Apache HTTP Server

High 7.5 Published 27 Jul 2017 Updated 16 Sep 2024

Attackers can exploit liberal whitespace handling to perform request smuggling, response splitting, and cache pollution in proxy or CGI chains.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2016-8743?

CVE-2016-8743 is a high-severity vulnerability in Apache Http Server, published on 27 Jul 2017. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Which versions are affected by CVE-2016-8743?

It affects 11 products.

Linux distribution packages (24)

`httpd` Red Hat:enterprise_linux:6::client	All versions	`0:2.2.15-60.el6_9.4`
`httpd-debuginfo` Red Hat:enterprise_linux:6::client	All versions	`0:2.2.15-60.el6_9.4`
`httpd-devel` Red Hat:enterprise_linux:6::client	All versions	`0:2.2.15-60.el6_9.4`
`httpd-manual` Red Hat:enterprise_linux:6::client	All versions	`0:2.2.15-60.el6_9.4`
`httpd-tools` Red Hat:enterprise_linux:6::client	All versions	`0:2.2.15-60.el6_9.4`
`mod_ssl` Red Hat:enterprise_linux:6::client	All versions	`1:2.2.15-60.el6_9.4`
`httpd` Red Hat:enterprise_linux:6::computenode	All versions	`0:2.2.15-60.el6_9.4`
`httpd-debuginfo` Red Hat:enterprise_linux:6::computenode	All versions	`0:2.2.15-60.el6_9.4`
`httpd-devel` Red Hat:enterprise_linux:6::computenode	All versions	`0:2.2.15-60.el6_9.4`
`httpd-manual` Red Hat:enterprise_linux:6::computenode	All versions	`0:2.2.15-60.el6_9.4`
`httpd-tools` Red Hat:enterprise_linux:6::computenode	All versions	`0:2.2.15-60.el6_9.4`
`mod_ssl` Red Hat:enterprise_linux:6::computenode	All versions	`1:2.2.15-60.el6_9.4`
`httpd` Red Hat:enterprise_linux:6::server	All versions	`0:2.2.15-60.el6_9.4`
`httpd-debuginfo` Red Hat:enterprise_linux:6::server	All versions	`0:2.2.15-60.el6_9.4`
`httpd-devel` Red Hat:enterprise_linux:6::server	All versions	`0:2.2.15-60.el6_9.4`
`httpd-manual` Red Hat:enterprise_linux:6::server	All versions	`0:2.2.15-60.el6_9.4`
`httpd-tools` Red Hat:enterprise_linux:6::server	All versions	`0:2.2.15-60.el6_9.4`
`mod_ssl` Red Hat:enterprise_linux:6::server	All versions	`1:2.2.15-60.el6_9.4`
`httpd` Red Hat:enterprise_linux:6::workstation	All versions	`0:2.2.15-60.el6_9.4`
`httpd-debuginfo` Red Hat:enterprise_linux:6::workstation	All versions	`0:2.2.15-60.el6_9.4`
`httpd-devel` Red Hat:enterprise_linux:6::workstation	All versions	`0:2.2.15-60.el6_9.4`
`httpd-manual` Red Hat:enterprise_linux:6::workstation	All versions	`0:2.2.15-60.el6_9.4`
`httpd-tools` Red Hat:enterprise_linux:6::workstation	All versions	`0:2.2.15-60.el6_9.4`
`mod_ssl` Red Hat:enterprise_linux:6::workstation	All versions	`1:2.2.15-60.el6_9.4`

Products include Apache Http Server, Debian Debian Linux, Netapp Clustered Data Ontap, Netapp Oncommand Unified Manager, Redhat Enterprise Linux Desktop, Redhat Enterprise Linux Eus and 5 more.

How do I fix CVE-2016-8743?

Upgrade to a fixed version.

Is CVE-2016-8743 being exploited?

There is no known exploitation of CVE-2016-8743 in the wild and no public exploit code.

All Apache Http Server vulnerabilities

Sources

Also known as DEBIAN-CVE-2016-8743, DLA-841-1, DLA-841-2, GHSA-2rfh-2gh8-v9fq, RHSA-2017:1721, UBUNTU-CVE-2016-8743.