Bug 1743129 (CVE-2019-14809)

Summary:	CVE-2019-14809 golang: malformed hosts in URLs leads to authorization bypass
Product:	[Other] Security Response	Reporter:	Dhananjay Arunesh <darunesh>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	admiller, amurdaca, asm, bodavis, dbecker, deparker, emachado, jcajka, jjoyce, jpadman, jschluet, kbasil, law, lemenkov, lhh, lpeer, mburns, mnewsome, puebele, renich, sclewis, sisharma, slinaber, tstellar, vbatts
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	go 1.12.8	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2019-11-06 00:53:15 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:	1743130, 1743131, 1746231, 1746232, 1746233, 1750551, 1750552, 1750553
Bug Blocks:	1743132

Description Dhananjay Arunesh 2019-08-19 07:37:48 UTC

A vulnerability was found in net/url in Go before 1.11.13 and 1.12.x before 1.12.8 mishandles malformed hosts in URLs, leading to an authorization bypass in some applications. This is related to a Host field with a suffix appearing in neither Hostname() nor Port(), and is related to a non-numeric port number. For example, an attacker can compose a crafted javascript:// URL that results in a hostname of google.com.

Reference:
https://github.com/golang/go/issues/29098

Upstream commit:
https://github.com/golang/go/commit/61bb56ad63992a3199acc55b2537c8355ef887b6

Comment 1 Dhananjay Arunesh 2019-08-19 07:38:07 UTC

Created golang tracking bugs for this issue:

Affects: epel-all [bug 1743130]
Affects: fedora-all [bug 1743131]

Comment 8 Marco Benatto 2019-09-10 15:14:29 UTC

The Go language has an utility which can be used to parse host name strings. The utility can be accessed by calling url.Parse(url) call and returns an object of type URL. This object has two different methods called Hostname() and Port(), those calls returns the hostname itself and the port number from the parsed url string. When url string is malformed the behavior of both calls above are unpredictable sometimes returning unexpected hostname values. An attacker can leverage this bug by crafting specially formatted invalid URL as input to url.Parse(), this will lead url.Hostname() calls to return a host name controlled by the attacker allowing authorization bypass and other consequences depending on how those calls are used.

Comment 9 Marco Benatto 2019-09-10 15:15:14 UTC

Statement:

This flaw has no mitigation for any affected golang package versions.

Comment 11 Nick Tait 2019-09-11 18:45:48 UTC

External References:

https://github.com/golang/go/commit/61bb56ad63992a3199acc55b2537c8355ef887b6
https://github.com/golang/go/issues/29098

Comment 12 errata-xmlrpc 2019-11-05 20:54:29 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 8

Via RHSA-2019:3433 https://access.redhat.com/errata/RHSA-2019:3433

Comment 13 Product Security DevOps Team 2019-11-06 00:53:15 UTC

This bug is now closed. Further updates for individual products will be reflected on the CVE page(s):

https://access.redhat.com/security/cve/cve-2019-14809