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CVE-2016-5387

HIGHCVSS 8.1/10EPSS 55.72%

Last modified

CVE-2016-5387 is a high-severity vulnerability rated 8.1/10 on the CVSS scale. 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.. EPSS estimates a 55.72% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
8.1/10

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability
55.72%

98.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

VendorProductVersions
ApacheHttp Server>= 2.2.0, <= 2.2.31
ApacheHttp Server>= 2.4.1, <= 2.4.23
HpSystem Management Homepage<= 7.5.5.0
OracleCommunications User Data Repository>= 10.0.0, <= 12.4
OracleEnterprise Manager Ops Center12.2.2
OracleEnterprise Manager Ops Center12.3.2
OracleLinux5
OracleLinux6
OracleLinux7
OracleSolaris11.3
FedoraprojectFedora23
FedoraprojectFedora24
RedhatJboss Web Server2.1.0
RedhatJboss Enterprise Web Server2.0.0
RedhatJboss Enterprise Web Server3.0.0
RedhatJboss Core Services1.0
RedhatEnterprise Linux Desktop6.0
RedhatEnterprise Linux Desktop7.0
RedhatEnterprise Linux Eus7.2
RedhatEnterprise Linux Eus7.3
RedhatEnterprise Linux Eus7.4
RedhatEnterprise Linux Eus7.5
RedhatEnterprise Linux Eus7.6
RedhatEnterprise Linux Eus7.7
RedhatEnterprise Linux Server6.0
RedhatEnterprise Linux Server7.0
RedhatEnterprise Linux Server Aus7.2
RedhatEnterprise Linux Server Aus7.3
RedhatEnterprise Linux Server Aus7.4
RedhatEnterprise Linux Server Aus7.6
RedhatEnterprise Linux Server Aus7.7
RedhatEnterprise Linux Server Tus7.2
RedhatEnterprise Linux Server Tus7.3
RedhatEnterprise Linux Server Tus7.6
RedhatEnterprise Linux Server Tus7.7
RedhatEnterprise Linux Workstation6.0
RedhatEnterprise Linux Workstation7.0
DebianDebian Linux8.0
CanonicalUbuntu Linux12.04
CanonicalUbuntu Linux14.04
CanonicalUbuntu Linux15.10
CanonicalUbuntu Linux16.04
OpensuseLeap42.1
OpensuseOpensuse13.2

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2016-5387?
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.
How severe is CVE-2016-5387?
CVE-2016-5387 has a CVSS score of 8.1/10 (HIGH severity). The EPSS model estimates a 55.72% probability of exploitation in the next 30 days.
How do I fix CVE-2016-5387?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST