ID CVE-2016-8743
Summary 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.
References
Vulnerable Configurations
  • cpe:2.3:a:apache:http_server:2.4.1:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.1:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.2:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.2:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.3:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.3:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.4:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.4:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.6:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.6:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.7:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.7:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.9:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.9:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.10:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.10:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.12:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.12:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.16:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.16:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.17:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.17:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.18:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.20:*:*:*:*:*:*:*
  • cpe:2.3:a:apache:http_server:2.4.23:*:*:*:*:*:*:*
    cpe:2.3:a:apache:http_server:2.4.23:*:*:*:*:*:*:*
CVSS
Base: 5.0 (as of 25-04-2018 - 01:29)
Impact:
Exploitability:
CWE CWE-19
CAPEC
  • Overflow Buffers
    Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash or potentially redirection of execution as per the attackers' choice.
  • XML Nested Payloads
    Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. By nesting XML data and causing this data to be continuously self-referential, an attacker can cause the XML parser to consume more resources while processing, causing excessive memory consumption and CPU utilization. An attacker's goal is to leverage parser failure to his or her advantage. In most cases this type of an attack will result in a denial of service due to an application becoming unstable, freezing, or crash. However it may be possible to cause a crash resulting in arbitrary code execution, leading to a jump from the data plane to the control plane [R.230.1].
  • XML Oversized Payloads
    Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. By supplying oversized payloads in input vectors that will be processed by the XML parser, an attacker can cause the XML parser to consume more resources while processing, causing excessive memory consumption and CPU utilization, and potentially cause execution of arbitrary code. An attacker's goal is to leverage parser failure to his or her advantage. In many cases this type of an attack will result in a denial of service due to an application becoming unstable, freezing, or crash. However it is possible to cause a crash resulting in arbitrary code execution, leading to a jump from the data plane to the control plane [R.231.1].
  • XML Client-Side Attack
    Client applications such as web browsers that process HTML data often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. These adverse effects may include the parser crashing, consuming too much of a resource, executing too slowly, executing code supplied by an attacker, allowing usage of unintended system functionality, etc. An attacker's goal is to leverage parser failure to his or her advantage. In some cases it may be possible to jump from the data plane to the control plane via bad data being passed to an XML parser. [R.484.1]
  • XML Parser Attack
    Applications often need to transform data in and out of the XML format by using an XML parser. It may be possible for an attacker to inject data that may have an adverse effect on the XML parser when it is being processed. These adverse effects may include the parser crashing, consuming too much of a resource, executing too slowly, executing code supplied by an attacker, allowing usage of unintended system functionality, etc. An attacker's goal is to leverage parser failure to his or her advantage. In some cases it may be possible to jump from the data plane to the control plane via bad data being passed to an XML parser. [R.99.1]
Access
VectorComplexityAuthentication
NETWORK LOW NONE
Impact
ConfidentialityIntegrityAvailability
NONE PARTIAL NONE
cvss-vector via4 AV:N/AC:L/Au:N/C:N/I:P/A:N
redhat via4
advisories
  • bugzilla
    id 1429947
    title Backport: mod_proxy_wstunnel - AH02447: err/hup on backconn
    oval
    AND
    • OR
      • comment Red Hat Enterprise Linux 7 Client is installed
        oval oval:com.redhat.rhba:tst:20150364001
      • comment Red Hat Enterprise Linux 7 Server is installed
        oval oval:com.redhat.rhba:tst:20150364002
      • comment Red Hat Enterprise Linux 7 Workstation is installed
        oval oval:com.redhat.rhba:tst:20150364003
      • comment Red Hat Enterprise Linux 7 ComputeNode is installed
        oval oval:com.redhat.rhba:tst:20150364004
    • OR
      • AND
        • comment httpd is earlier than 0:2.4.6-45.el7_3.4
          oval oval:com.redhat.rhsa:tst:20170906007
        • comment httpd is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245017
      • AND
        • comment httpd-devel is earlier than 0:2.4.6-45.el7_3.4
          oval oval:com.redhat.rhsa:tst:20170906005
        • comment httpd-devel is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245019
      • AND
        • comment httpd-manual is earlier than 0:2.4.6-45.el7_3.4
          oval oval:com.redhat.rhsa:tst:20170906019
        • comment httpd-manual is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245025
      • AND
        • comment httpd-tools is earlier than 0:2.4.6-45.el7_3.4
          oval oval:com.redhat.rhsa:tst:20170906015
        • comment httpd-tools is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245023
      • AND
        • comment mod_ldap is earlier than 0:2.4.6-45.el7_3.4
          oval oval:com.redhat.rhsa:tst:20170906013
        • comment mod_ldap is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20140921010
      • AND
        • comment mod_proxy_html is earlier than 1:2.4.6-45.el7_3.4
          oval oval:com.redhat.rhsa:tst:20170906011
        • comment mod_proxy_html is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20140921008
      • AND
        • comment mod_session is earlier than 0:2.4.6-45.el7_3.4
          oval oval:com.redhat.rhsa:tst:20170906017
        • comment mod_session is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20140921016
      • AND
        • comment mod_ssl is earlier than 1:2.4.6-45.el7_3.4
          oval oval:com.redhat.rhsa:tst:20170906009
        • comment mod_ssl is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245021
    rhsa
    id RHSA-2017:0906
    released 2017-04-12
    severity Moderate
    title RHSA-2017:0906: httpd security and bug fix update (Moderate)
  • bugzilla
    id 1463354
    title segfault in ap_proxy_set_scoreboard_lb
    oval
    AND
    • OR
      • comment Red Hat Enterprise Linux 6 Client is installed
        oval oval:com.redhat.rhba:tst:20111656001
      • comment Red Hat Enterprise Linux 6 Server is installed
        oval oval:com.redhat.rhba:tst:20111656002
      • comment Red Hat Enterprise Linux 6 Workstation is installed
        oval oval:com.redhat.rhba:tst:20111656003
      • comment Red Hat Enterprise Linux 6 ComputeNode is installed
        oval oval:com.redhat.rhba:tst:20111656004
    • OR
      • AND
        • comment httpd is earlier than 0:2.2.15-60.el6_9.4
          oval oval:com.redhat.rhsa:tst:20171721005
        • comment httpd is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245017
      • AND
        • comment httpd-devel is earlier than 0:2.2.15-60.el6_9.4
          oval oval:com.redhat.rhsa:tst:20171721007
        • comment httpd-devel is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245019
      • AND
        • comment httpd-manual is earlier than 0:2.2.15-60.el6_9.4
          oval oval:com.redhat.rhsa:tst:20171721013
        • comment httpd-manual is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245025
      • AND
        • comment httpd-tools is earlier than 0:2.2.15-60.el6_9.4
          oval oval:com.redhat.rhsa:tst:20171721009
        • comment httpd-tools is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245023
      • AND
        • comment mod_ssl is earlier than 1:2.2.15-60.el6_9.4
          oval oval:com.redhat.rhsa:tst:20171721011
        • comment mod_ssl is signed with Red Hat redhatrelease2 key
          oval oval:com.redhat.rhsa:tst:20111245021
    rhsa
    id RHSA-2017:1721
    released 2017-07-11
    severity Moderate
    title RHSA-2017:1721: httpd security and bug fix update (Moderate)
  • rhsa
    id RHSA-2017:1161
  • rhsa
    id RHSA-2017:1413
  • rhsa
    id RHSA-2017:1414
  • rhsa
    id RHSA-2017:1415
rpms
  • httpd-0:2.4.6-45.el7_3.4
  • httpd-devel-0:2.4.6-45.el7_3.4
  • httpd-manual-0:2.4.6-45.el7_3.4
  • httpd-tools-0:2.4.6-45.el7_3.4
  • mod_ldap-0:2.4.6-45.el7_3.4
  • mod_proxy_html-1:2.4.6-45.el7_3.4
  • mod_session-0:2.4.6-45.el7_3.4
  • mod_ssl-1:2.4.6-45.el7_3.4
  • httpd-0:2.2.15-60.el6_9.4
  • httpd-devel-0:2.2.15-60.el6_9.4
  • httpd-manual-0:2.2.15-60.el6_9.4
  • httpd-tools-0:2.2.15-60.el6_9.4
  • mod_ssl-1:2.2.15-60.el6_9.4
refmap via4
bid 95077
confirm
debian DSA-3796
gentoo GLSA-201701-36
sectrack 1037508
Last major update 25-04-2018 - 01:29
Published 27-07-2017 - 21:29
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