Bug 1324343 (CVE-2016-3959)

Summary:	CVE-2016-3959 golang: infinite loop in several big integer routines
Product:	[Other] Security Response	Reporter:	Andrej Nemec <anemec>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aavati, admiller, amurdaca, bleanhar, ccoleman, dmcphers, dmoppert, golang-updates, huzaifas, jcajka, jialiu, jkeck, jokerman, kseifried, lemenkov, lmeyer, mmccomas, nlevinki, renich, rfortier, rhs-bugs, sgirijan, sisharma, smohan, ssaha, s, vbatts, vbellur
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	golang 1.5.4, golang 1.6.1	Doc Type:	Bug Fix
Doc Text:	A denial of service vulnerability was found in Go's verification of DSA public keys. An attacker could provide a crafted key to HTTPS client or SSH server libraries which would cause the application to enter an infinite loop.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2016-11-04 02:16:16 UTC	Type:	---
Regression:	---	Mount Type:	---
Documentation:	---	CRM:
Verified Versions:		Category:	---
oVirt Team:	---	RHEL 7.3 requirements from Atomic Host:
Cloudforms Team:	---	Target Upstream Version:
Embargoed:
Bug Depends On:	1324344, 1324345, 1330039, 1330040
Bug Blocks:	1324346

Description Andrej Nemec 2016-04-06 06:36:49 UTC

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.

Upstream fix:

https://go-review.googlesource.com/#/c/21533/

References:

http://seclists.org/oss-sec/2016/q2/11

Comment 1 Andrej Nemec 2016-04-06 06:37:17 UTC

Created golang tracking bugs for this issue:

Affects: fedora-all [bug 1324344]
Affects: epel-6 [bug 1324345]

Comment 2 Fedora Update System 2016-04-17 23:41:25 UTC

golang-1.6.1-1.fc24 has been pushed to the Fedora 24 stable repository. If problems still persist, please make note of it in this bug report.

Comment 4 Fedora Update System 2016-04-25 22:21:33 UTC

golang-1.5.4-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.

Comment 5 Fedora Update System 2016-04-25 23:53:59 UTC

golang-1.5.4-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.

Comment 8 Tomas Hoger 2016-10-05 07:38:26 UTC

This was fixed upstream in versions 1.5.4 and 1.6.1.  Upstream bug and release notes:

https://github.com/golang/go/issues/15184
https://golang.org/doc/devel/release.html#go1.6
https://golang.org/doc/devel/release.html#go1.5

Upstream bug also notes this related change fixing similar problem for rsa and ecdsa, for which no trigger is known:

https://golang.org/cl/21560