The Verify function in crypto/dsa/dsa.go in Go before 1.5.4 and 1.6.x before 1.6.1 does not properly check parameters passed to the big integer library, which might allow remote attackers to cause a denial of service (infinite loop) via a crafted public key to a program that uses HTTPS client certificates or SSH server libraries.

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 go update to version 1.6 fixes the following issues :

Security issues fixed :

  - CVE-2016-3959: Infinite loop in several big integer     routines (boo#974232)

  - CVE-2015-8618: Carry propagation in Int.Exp Montgomery     code in math/big library (boo#960151)

Bugs fixed :

  - Update to version 1.6 :

  - On Linux on little-endian 64-bit PowerPC     (linux/ppc64le), Go 1.6 now supports cgo with external     linking and is roughly feature complete.

  - Vendoring support

  - HTTP2 transparent support

  - fix gc and gccgo incompatibility regarding embedded     unexported struct types containing exported fields

  - Linux on 64-bit MIPS and Android on 32-bit x86

  - enforced rules for sharing Go pointers with C

  - new mechanism for template reuse

  - performance improvements ... and more! see more in     https://tip.golang.org/doc/go1.6 

  - Updated to version 1.5.2: This release includes bug     fixes to the compiler, linker, and the mime/multipart,     net, and runtime packages.
    https://golang.org/doc/devel/release.html#go1.5.minor

  - Updated to version 1.5.1: &#9;This release includes bug     fixes to the go command, the compiler, assembler, and     the fmt, net/textproto, net/http, and runtime packages.
    https://golang.org/doc/devel/release.html#go1.5.minor

  - Update to version 1.5 :

  - see https://golang.org/doc/go1.5 

  - install shared stdlib on x86_64

  - add go.gdbinit for debug friendly

  - Adapt to Leap

  - use gcc5-go than go1.4 is the proper requirement for     Leap

Security fix for CVE-2016-3959

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.

An infinite loop in several big integer routines was discovered that makes Go programs vulnerable to remote denial of service attacks.
Programs using HTTPS client authentication or the Go ssh server libraries are both exposed to this vulnerability.

Jason Buberel reports :

Go has an infinite loop in several big integer routines that makes Go programs vulnerable to remote denial of service attacks. Programs using HTTPS client authentication or the Go ssh server libraries are both exposed to this vulnerability.

ID	Name	Product	Family	Severity
92693	RHEL 7 : golang (RHSA-2016:1538) (httpoxy)	Nessus	Red Hat Local Security Checks	critical
92680	CentOS 7 : golang (CESA-2016:1538) (httpoxy)	Nessus	CentOS Local Security Checks	critical
91276	openSUSE Security Update : go (openSUSE-2016-606)	Nessus	SuSE Local Security Checks	high
90731	Fedora 22 : golang-1.5.4-1.fc22 (2016-59c5e405e3)	Nessus	Fedora Local Security Checks	high
90729	Fedora 23 : golang-1.5.4-1.fc23 (2016-2fcfc7670f)	Nessus	Fedora Local Security Checks	high
90644	Fedora 24 : golang-1.6.1-1.fc24 (2016-2940ad5550)	Nessus	Fedora Local Security Checks	high
90629	Amazon Linux AMI : golang (ALAS-2016-687)	Nessus	Amazon Linux Local Security Checks	high
90521	FreeBSD : go -- remote denial of service (f2217cdf-01e4-11e6-b1ce-002590263bf5)	Nessus	FreeBSD Local Security Checks	high

Detections

Analytics

CVE-2016-3959

high

Tenable Plugins

critical

critical

high

high

high

high

high

high