Bug 1803608 (CVE-2020-1742)

Summary:	CVE-2020-1742 nmstate/kubernetes-nmstate-handler: /etc/passwd is given incorrect privileges
Product:	[Other] Security Response	Reporter:	Joshua Padman <jpadman>
Component:	vulnerability	Assignee:	Red Hat Product Security <security-response-team>
Status:	CLOSED ERRATA	QA Contact:
Severity:	medium	Docs Contact:
Priority:	medium
Version:	unspecified	CC:	cnv-qe-bugs, fdeutsch, mcooper, phoracek, snikolov
Target Milestone:	---	Keywords:	Security
Target Release:	---
Hardware:	All
OS:	Linux
Whiteboard:
Fixed In Version:	kubernetes-nmstate-handler-container-v2.3.0-30	Doc Type:	If docs needed, set a value
Doc Text:	An insecure modification vulnerability flaw was found in containers using nmstate/kubernetes-nmstate-handler. 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:	2021-10-28 02:03:18 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:	1803609
Bug Blocks:	1776664

Description Joshua Padman 2020-02-17 02:42:03 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 nmstate/kubernetes-nmstate-handler container.

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

Comment 1 Joshua Padman 2020-02-17 02:42:07 UTC

Acknowledgments:

Name: Joseph LaMagna-Reiter (SPR Inc.)

Comment 2 Joshua Padman 2020-02-17 02:42:09 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 11 Mark Cooper 2021-10-28 02:03:18 UTC

Used fixcvenames on https://errata.devel.redhat.com/advisory/48747 and fixed the affects

Closing the old flaw bug