#VU32310 Input validation error in Go programming language - CVE-2016-3959

Vulnerability identifier: #VU32310

Vulnerability risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2016-3959

CWE-ID: CWE-20

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Go programming language
Universal components / Libraries / Scripting languages

Vendor: Google

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

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

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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.