CVE-2016-5387
Publication date 18 July 2016
Last updated 25 August 2025
Ubuntu priority
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.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| apache2 | 16.04 LTS xenial |
Fixed 2.4.18-2ubuntu3.1
|
| 14.04 LTS trusty |
Fixed 2.4.7-1ubuntu4.13
|
|
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score |
8.1 · High
|
| Attack vector | Network |
| Attack complexity | High |
| Privileges required | None |
| User interaction | None |
| Scope | Unchanged |
| Confidentiality | High |
| Integrity impact | High |
| Availability impact | High |
| Vector | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H |
References
Related Ubuntu Security Notices (USN)
- USN-3038-1
- Apache HTTP Server vulnerability
- 18 July 2016