Bug 1793302 (CVE-2020-1706)

Summary:	CVE-2020-1706 openshift/apb-tools: /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:	bmontgom, eparis, jburrell, jokerman, nstielau, security-response-team, 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/apb-tools. 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:	2020-06-03 11:20:31 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:	1793364, 1793365, 1793366, 1793367
Bug Blocks:	1776664

Description Mark Cooper 2020-01-21 06:20:58 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/apb-tools-container.

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

Comment 1 Mark Cooper 2020-01-21 06:21:01 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 03:22:43 UTC

Acknowledgments:

Name: Joseph LaMagna-Reiter (SPR Inc.)

Comment 10 errata-xmlrpc 2020-06-03 09:41:52 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.2

Via RHSA-2020:2305 https://access.redhat.com/errata/RHSA-2020:2305

Comment 11 Product Security DevOps Team 2020-06-03 11:20:31 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-2020-1706

Comment 12 errata-xmlrpc 2020-06-17 20:17:33 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.3

Via RHSA-2020:2442 https://access.redhat.com/errata/RHSA-2020:2442