The net/http library in net/http/transfer.go in Go before 1.4.3 does not properly parse HTTP headers, which allows remote attackers to conduct HTTP request smuggling attacks via a request with two Content-length headers.

An update for golang is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The golang packages provide the Go programming language compiler.

The following packages have been upgraded to a newer upstream version:
golang (1.6.3). (BZ#1346331)

Security Fix(es) :

* 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. (CVE-2016-5386)

Red Hat would like to thank Scott Geary (VendHQ) for reporting this issue.

From Red Hat Security Advisory 2016:1538 :

An update for golang is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security impact of Moderate. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

The golang packages provide the Go programming language compiler.

The following packages have been upgraded to a newer upstream version:
golang (1.6.3). (BZ#1346331)

Security Fix(es) :

* 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. (CVE-2016-5386)

Red Hat would like to thank Scott Geary (VendHQ) for reporting this issue.

This update for go fixes the following issues :

  - CVE-2015-5739: 'Content Length' treated as valid header

  - CVE-2015-5740: Double content-length headers does not     return 400 error

  - CVE-2015-5741: Additional hardening, not sending     Content-Length w/Transfer-Encoding, Closing connections

Go was updated to 1.4.3 with the following additional changes :

  - build: remove -Werror from cmd/dist

  - runtime: panic when accessing an empty struct value     appended to an uninitialized slice

  - runtime: garbage collector found invalid heap pointer     iterating over map

golang-1.5.1-0.fc21 - update to go1.5.1 golang-1.5.1-0.fc22 - update to go1.5.1 golang-1.5.1-0.el6 - update to go1.5.1 golang-1.5.1-0.fc23
- update to go1.5.1 ---- bz1258166 remove srpm macros, for go-srpm-macros ---- update to go1.5; shared objects for x86_64; gdb fixes; full http smuggle fix; fixes for tests ---- bz1258166 remove srpm macros, for go-srpm-macros

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

golang-1.5.1-0.fc21 - update to go1.5.1 golang-1.5.1-0.fc22 - update to go1.5.1 golang-1.5.1-0.el6 - update to go1.5.1 golang-1.5.1-0.fc23
- update to go1.5.1 ---- update to go1.5; shared objects for x86_64;
gdb fixes; full http smuggle fix; fixes for tests

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Jason Buberel, Go Product Manager, reports :

CVE-2015-5739 - 'Content Length' treated as valid header

CVE-2015-5740 - Double content-length headers does not return 400 error

CVE-2015-5741 - Additional hardening, not sending Content-Length w/Transfer-Encoding, Closing connections

As discussed upstream -- here and here -- the Go project received notification of an HTTP request smuggling vulnerability in the net/http library. Invalid headers are parsed as valid headers (like 'Content Length:' with a space in the middle) and Double Content-length headers in a request does not generate a 400 error, the second Content-length is ignored.

security fixes for net/http smuggling

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

ID	Name	Product	Family	Severity
92693	RHEL 7 : golang (RHSA-2016:1538) (httpoxy)	Nessus	Red Hat Local Security Checks	critical
92687	Oracle Linux 7 : golang (ELSA-2016-1538) (httpoxy)	Nessus	Oracle Linux Local Security Checks	critical
92680	CentOS 7 : golang (CESA-2016:1538) (httpoxy)	Nessus	CentOS Local Security Checks	critical
92596	openSUSE Security Update : go (openSUSE-2016-907)	Nessus	SuSE Local Security Checks	critical
86232	Fedora 22 : golang-1.5.1-0.fc22 (2015-15619)	Nessus	Fedora Local Security Checks	critical
86231	Fedora 21 : golang-1.5.1-0.fc21 (2015-15618)	Nessus	Fedora Local Security Checks	critical
85641	FreeBSD : go -- multiple vulnerabilities (4464212e-4acd-11e5-934b-002590263bf5)	Nessus	FreeBSD Local Security Checks	critical
85633	Amazon Linux AMI : golang / docker (ALAS-2015-588)	Nessus	Amazon Linux Local Security Checks	critical
85476	Fedora 22 : golang-1.4.2-3.fc22 (2015-13002)	Nessus	Fedora Local Security Checks	critical
85471	Fedora 21 : golang-1.4.2-3.fc21 (2015-12957)	Nessus	Fedora Local Security Checks	critical

Detections

Analytics

CVE-2015-5740

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Tenable Plugins

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