Bug 1546395 (CVE-2017-18190)

Summary:	CVE-2017-18190 cups: DNS rebinding attacks via incorrect whitelist
Product:	[Other] Security Response	Reporter:	Laura Pardo <lpardo>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	jpopelka, kyoshida, security-response-team, twaugh, zdohnal
Target Milestone:	---	Keywords:	Reopened, Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	cups 2.2.2	Doc Type:	If docs needed, set a value
Doc Text:		Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-09-29 21:57:10 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:	1823758
Bug Blocks:	1823329

Description Laura Pardo 2018-02-16 23:10:18 UTC

A flaw was found in CUPS. A localhost.localdomain whitelist entry in valid_host() in scheduler/client.c in CUPS before 2.2.2 allows remote attackers to execute arbitrary IPP commands by sending POST requests to the CUPS daemon in conjunction with DNS rebinding. The localhost.localdomain name is often resolved via a DNS server (neither the OS nor the web browser is responsible for ensuring that localhost.localdomain is 127.0.0.1).

External References:
https://bugs.chromium.org/p/project-zero/issues/detail?id=1048

Upstream Patch:
https://github.com/apple/cups/commit/afa80cb2b457bf8d64f775bed307588610476c41

Comment 8 Stefan Cornelius 2020-04-15 17:28:01 UTC

Mitigation:

Ensure that "localhost.localdomain" resolves to 127.0.0.1, for example by adding it to /etc/hosts. This is the default on Red Hat Enterprise Linux 7.

Comment 9 errata-xmlrpc 2020-09-29 19:21:43 UTC

This issue has been addressed in the following products:

  Red Hat Enterprise Linux 7

Via RHSA-2020:3864 https://access.redhat.com/errata/RHSA-2020:3864

Comment 10 Product Security DevOps Team 2020-09-29 21:57:10 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-2017-18190