Security restrictions bypass in Google Go

Published: 2019-08-19

Risk	Low
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2019-14809
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software Subscribe	Go programming language Universal components / Libraries / Scripting languages
Vendor	Google

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Input validation error

EUVDB-ID: #VU20301

Risk: Low

CVSSv3.1: 3.7 [CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-14809

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows a remote attacker to bypass certain security restrictions.

The vulnerability exists due to incorrect processing of URLs in net/url, related to the Host field with a suffix appearing in neither Hostname() nor Port(), and is related to a non-numeric port number. A remote attacker can create a crafted javascript:// URL that in certain situations can be used to bypass authorization checks for some applications.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Go programming language: 1.11.1 - 1.12.7

External links

http://github.com/golang/go/issues/29098
http://groups.google.com/forum/#!topic/golang-announce/0uuMm1BwpHE
http://groups.google.com/forum/#!topic/golang-announce/65QixT3tcmg

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.