Bug 1793304 (CVE-2020-1705)

Summary:	CVE-2020-1705 openshift/template-service-broker-operator: /etc/passwd is given incorrect privileges
Product:	[Other] Security Response	Reporter:	Mark Cooper <mcooper>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	aos-bugs, bmontgom, eparis, jburrell, jokerman, nstielau, security-response-team, shurley, sponnaga
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:		Doc Type:	If docs needed, set a value
Doc Text:	An insecure modification vulnerability in the /etc/passwd file was found in the openshift/template-service-broker-operator. An attacker with access to the container could use this flaw to modify /etc/passwd and escalate their privileges.	Story Points:	---
Clone Of:		Environment:
Last Closed:	2020-03-24 16:31:51 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:	1793368, 1793369, 1793370
Bug Blocks:	1776664

Description Mark Cooper 2020-01-21 06:32:07 UTC

It has been found that multiple containers modify the permissions of /etc/passwd to make them modifiable by users other than root. An attacker with access to the running container can exploit this to modify /etc/passwd to add a user and escalate their privileges. This CVE is specific to the openshift/template-service-broker-operator-container.

Original bug:
https://bugzilla.redhat.com/show_bug.cgi?id=1791534

Comment 1 Mark Cooper 2020-01-21 06:32:09 UTC

Statement:

By default this vulnerability is not exploitable in un-privilieged containers running on OpenShift Container Platform. This is because the system call SETUID and SETGID is blocked by the default seccomp policy.

Comment 4 Mark Cooper 2020-01-22 03:22:54 UTC

Acknowledgments:

Name: Joseph LaMagna-Reiter (SPR Inc.)

Comment 8 errata-xmlrpc 2020-03-24 14:15:45 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.3

Via RHSA-2020:0866 https://access.redhat.com/errata/RHSA-2020:0866

Comment 9 Product Security DevOps Team 2020-03-24 16:31:51 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-2020-1705

Comment 10 Mark Cooper 2020-06-17 04:48:50 UTC

This issues has been addressed in the following products:
  Red Hat OpenShift Container Platform 4.2

Released in this errata with FixCVENames: 
RHBA-2020:1278 https://access.redhat.com/errata/RHBA-2020:1278