Input validation error in Google, Go programming language

1) Input validation error

EUVDB-ID: #VU32310

Risk: Medium

CVSSv3.1: 6.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2016-3959

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

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.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Go programming language: 1.5.1 - 1.5.3

CPE2.3

• cpe:2.3:a:google:golang:1.5.3:*:*:*:*:*:*:*

External links

http://lists.fedoraproject.org/pipermail/package-announce/2016-April/182526.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183106.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-April/183137.html
http://lists.opensuse.org/opensuse-updates/2016-05/msg00077.html
http://rhn.redhat.com/errata/RHSA-2016-1538.html
http://www.openwall.com/lists/oss-security/2016/04/05/1
http://www.openwall.com/lists/oss-security/2016/04/05/2
http://go-review.googlesource.com/#/c/21533/
http://groups.google.com/forum/#!topic/golang-announce/9eqIHqaWvck

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.