An input-validation flaw was discovered in the Go programming language built in CGI implementation, which set the environment variable "HTTP_PROXY" using the incoming "Proxy" HTTP-request header. The environment variable "HTTP_PROXY" is used by numerous web clients, including Go's net/http package, to specify a proxy server to use for HTTP and, in some cases, HTTPS requests. This meant that when a CGI-based web application ran, an attacker could specify a proxy server which the application then used for subsequent outgoing requests, allowing a man-in-the-middle attack.
Find out more about CVE-2016-5386 from the MITRE CVE dictionary dictionary and NIST NVD.
| Base Score | 5 |
|---|---|
| Base Metrics | AV:N/AC:L/Au:N/C:N/I:P/A:N |
| Access Vector | Network |
| Access Complexity | Low |
| Authentication | None |
| Confidentiality Impact | None |
| Integrity Impact | Partial |
| Availability Impact | None |
| CVSS3 Base Score | 5 |
|---|---|
| CVSS3 Base Metrics | CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:L/A:N |
| Attack Vector | Network |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | None |
| Scope | Changed |
| Confidentiality | None |
| Integrity Impact | Low |
| Availability Impact | None |
Find out more about Red Hat support for the Common Vulnerability Scoring System (CVSS).
| Platform | Errata | Release Date |
|---|---|---|
| Red Hat Enterprise Linux 7 (golang) | RHSA-2016:1538 | 2016-08-02 |
| Platform | Package | State |
|---|---|---|
| Red Hat OpenStack Platform Operational Tools 9 | golang | Not affected |
| Red Hat OpenShift Enterprise 3 | golang | Will not fix |
| Red Hat Enterprise Linux OpenStack Platform 8.0 Operational Tools for RHEL 7 | golang | Will not fix |
| Red Hat Enterprise Linux OpenStack Platform 7.0 Operational Tools for RHEL 7 | golang | Will not fix |
| Red Hat Enterprise Linux 7 | compat-sap-c++-5 | Not affected |
| Red Hat Enterprise Linux 7 | gcc | Not affected |
| Red Hat Enterprise Linux 7 | gcc-libraries | Not affected |
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