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Apache HTTPD: HTTP_PROXY environment variable "httpoxy" mitigation (CVE-2016-5387)

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Apache HTTPD: HTTP_PROXY environment variable "httpoxy" mitigation (CVE-2016-5387)

Severity
7
CVSS
(AV:N/AC:M/Au:N/C:P/I:P/A:P)
Published
07/18/2016
Created
07/25/2018
Added
07/27/2016
Modified
09/09/2022

Description

HTTP_PROXY is a well-defined environment variable in a CGI process, which collided with a number of libraries which failed to avoid colliding with this CGI namespace. A mitigation is provided for the httpd CGI environment to avoid populating the "HTTP_PROXY" variable from a "Proxy:" header, which has never been registered by IANA. This workaround and patch are documented in the ASF Advisory at asf-httpoxy-response.txt and incorporated in the 2.4.25 and 2.2.32 releases. Note: This is not assigned an httpd severity, as it is a defect in other software which overloaded well-established CGI environment variables, and does not reflect an error in HTTP server software.

Solution(s)

  • apache-httpd-upgrade-2_2_32
  • apache-httpd-upgrade-2_4_25

References

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