Bug 1793282 (CVE-2019-19351)

Summary:	CVE-2019-19351 openshift/jenkins: /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:	abenaiss, aos-bugs, bmontgom, eparis, jburrell, jokerman, nstielau, pbhattac, security-response-team, sponnaga, vbobade
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 container openshift/jenkins. 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:	2020-02-25 09:49:39 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:	1793320, 1793321, 1793322, 1793323, 1793324
Bug Blocks:	1776664

Description Mark Cooper 2020-01-21 04:32:23 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/jenkins-slave-base-rhel7-container

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

Comment 1 Mark Cooper 2020-01-21 04:32:25 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 03:18:51 UTC

Acknowledgments:

Name: Joseph LaMagna-Reiter (SPR Inc.)

Comment 5 errata-xmlrpc 2020-02-25 05:54:21 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.3

Via RHSA-2020:0562 https://access.redhat.com/errata/RHSA-2020:0562

Comment 6 Product Security DevOps Team 2020-02-25 09:49:39 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-2019-19351

Comment 7 errata-xmlrpc 2020-02-27 12:03:04 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 4.2

Via RHSA-2020:0526 https://access.redhat.com/errata/RHSA-2020:0526

Comment 9 errata-xmlrpc 2020-03-20 00:29:42 UTC

This issue has been addressed in the following products:

  Red Hat OpenShift Container Platform 3.11

Via RHSA-2020:0803 https://access.redhat.com/errata/RHSA-2020:0803