CVE-2016-5387

Description

The Apache HTTP Server through 2.4.23 follows RFC 3875 section 4.1.18 and therefore does not protect applications from the presence of untrusted client data in the HTTP_PROXY environment variable, which might allow remote attackers to redirect an application's outbound HTTP traffic to an arbitrary proxy server via a crafted Proxy header in an HTTP request, aka an "httpoxy" issue. NOTE: the vendor states "This mitigation has been assigned the identifier CVE-2016-5387"; in other words, this is not a CVE ID for a vulnerability.

8.1

CVSS

Severity: High

CVSS 3.1 •

CVSS 2.0 •

EPSS 73.12% Top 5%

Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory ubuntu.com Vendor Advisory opensuse.org Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory debian.org Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory fedoraproject.org Vendor Advisory redhat.com Vendor Advisory redhat.com Vendor Advisory fedoraproject.org Vendor Advisory gentoo.org Vendor Advisory redhat.com Vendor Advisory fedoraproject.org Vendor Advisory fedoraproject.org Vendor Advisory apache.org

Affected: n/a n/a

References

Link	Tags
http://www.securitytracker.com/id/1036330	vdb entry third party advisory broken link
https://access.redhat.com/errata/RHSA-2016:1420	third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2016:1635	third party advisory vendor advisory
https://support.apple.com/HT208221	third party advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05320149	third party advisory
http://www.securityfocus.com/bid/91816	vdb entry third party advisory
https://access.redhat.com/errata/RHSA-2016:1851	third party advisory vendor advisory
http://www.ubuntu.com/usn/USN-3038-1	third party advisory vendor advisory
http://www.kb.cert.org/vuls/id/797896	third party advisory us government resource
http://www.oracle.com/technetwork/security-advisory/cpujan2018-3236628.html	third party advisory patch
http://lists.opensuse.org/opensuse-updates/2016-07/msg00059.html	mailing list third party advisory vendor advisory
http://www.oracle.com/technetwork/topics/security/linuxbulletinjul2016-3090544.html	third party advisory
http://rhn.redhat.com/errata/RHSA-2016-1648.html	third party advisory vendor advisory
https://www.tenable.com/security/tns-2017-04	third party advisory
http://rhn.redhat.com/errata/RHSA-2016-1625.html	broken link third party advisory vendor advisory
http://www.debian.org/security/2016/dsa-3623	third party advisory vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-1649.html	third party advisory vendor advisory
https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722	third party advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03770en_us	third party advisory
https://access.redhat.com/errata/RHSA-2016:1422	third party advisory vendor advisory
http://www.oracle.com/technetwork/topics/security/bulletinoct2016-3090566.html	third party advisory
https://access.redhat.com/errata/RHSA-2016:1421	third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/6WCTE7443AYZ4EGELWLVNANA2WJCJIYI/	vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-1650.html	broken link third party advisory vendor advisory
http://rhn.redhat.com/errata/RHSA-2016-1624.html	broken link third party advisory vendor advisory
https://www.apache.org/security/asf-httpoxy-response.txt	vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/TGNHXJJSWDXAOEYH5TMXDPQVJMQQJOAZ/	vendor advisory
https://httpoxy.org/	third party advisory
http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622.html	third party advisory patch
https://security.gentoo.org/glsa/201701-36	third party advisory vendor advisory
https://access.redhat.com/errata/RHSA-2016:1636	third party advisory vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NEKZAB7MTWVSMORHTEMCQNFFMIHCYF76/	vendor advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QPQAPWQA774JPDRV4UIB2SZAX6D3UZCV/	vendor advisory
https://lists.apache.org/thread.html/56c2e7cc9deb1c12a843d0dc251ea7fd3e7e80293cde02fcd65286ba%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/84a3714f0878781f6ed84473d1a503d2cc382277e100450209231830%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/8d63cb8e9100f28a99429b4328e4e7cebce861d5772ac9863ba2ae6f%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/f7f95ac1cd9895db2714fa3ebaa0b94d0c6df360f742a40951384a53%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r57608dc51b79102f3952ae06f54d5277b649c86d6533dcd6a7d201f7%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rd18c3c43602e66f9cdcf09f1de233804975b9572b0456cc582390b6f%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/re3d27b6250aa8548b8845d314bb8a350b3df326cacbbfdfe4d455234%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rfbaf647d52c1cb843e726a0933f156366a806cead84fbd430951591b%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rf6449464fd8b7437704c55f88361b66f12d5b5f90bcce66af4be4ba9%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r9ea3538f229874c80a10af473856a81fbf5f694cd7f471cc679ba70b%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rc998b18880df98bafaade071346690c2bc1444adaa1a1ea464b93f0a%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/re1e3a24664d35bcd0a0e793e0b5fc6ca6c107f99a1b2c545c5d4b467%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r04e89e873d54116a0635ef2f7061c15acc5ed27ef7500997beb65d6f%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rdca61ae990660bacb682295f2a09d34612b7bb5f457577fe17f4d064%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r9f93cf6dde308d42a9c807784e8102600d0397f5f834890708bf6920%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rcc44594d4d6579b90deccd4536b5d31f099ef563df39b094be286b9e%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rb14daf9cc4e28d18cdc15d6a6ca74e565672fabf7ad89541071d008b%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rad01d817195e6cc871cb1d73b207ca326379a20a6e7f30febaf56d24%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/rd336919f655b7ff309385e34a143e41c503e133da80414485b3abcc9%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r476d175be0aaf4a17680ef98c5153b4d336eaef76fb2224cc94c463a%40%3Ccvs.httpd.apache.org%3E	mailing list
https://lists.apache.org/thread.html/r75cbe9ea3e2114e4271bbeca7aff96117b50c1b6eb7c4772b0337c1f%40%3Ccvs.httpd.apache.org%3E	mailing list

Frequently Asked Questions

What is the severity of CVE-2016-5387?: CVE-2016-5387 has been scored as a high severity vulnerability.
How to fix CVE-2016-5387?: To fix CVE-2016-5387, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2016-5387 being actively exploited in the wild?: It is possible that CVE-2016-5387 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~73% probability that this vulnerability will be exploited by malicious actors in the next 30 days.