Multiple vulnerabilities in OpenShift Container Platform

Published: 2020-03-11 | Updated: 2020-03-17

Risk	High
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-19921 CVE-2020-8945
CWE-ID	CWE-284 CWE-416
Exploitation vector	Network
Public exploit	Public exploit code for vulnerability #1 is available.
Vulnerable software Subscribe	Red Hat OpenShift Container Platform Client/Desktop applications / Software for system administration
Vendor	Red Hat Inc.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

Updated: 13.03.2020

Updated affected software and references for vulnerability #1.

Updated: 17.03.2020

Updated affected software and references for vulnerability #2.

1) Improper access control

EUVDB-ID: #VU25847

Risk: Low

CVSSv3.1: 6 [CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C]

CVE-ID: CVE-2019-19921

CWE-ID: CWE-284 - Improper Access Control

Exploit availability: No

Description

The vulnerability allows a local user to gain unauthorized access to sensitive information.

The vulnerability exists due to improper access restrictions, related to libcontainer/rootfs_linux.go in runc. A local user with ability to spawn two containers with custom volume-mount configurations, and run custom images can escalate privileges on the system.

Mitigation

Update to version 4.2.22.

Vulnerable software versions

Red Hat OpenShift Container Platform: 4.1.0 - 4.2.21

External links

http://access.redhat.com/errata/RHSA-2020:0688
http://access.redhat.com/errata/RHSA-2020:0695
http://bugzilla.redhat.com/show_bug.cgi?id=1796107
http://www.redhat.com/security/data/cve/CVE-2019-19921.html

Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.

2) Use-after-free

EUVDB-ID: #VU25501

Risk: High

CVSSv3.1: 8.5 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2020-8945

CWE-ID: CWE-416 - Use After Free

Exploit availability: No

Description

The vulnerability allows a remote attacker to compromise vulnerable system.

The vulnerability exists due to a use-after-free error, as demonstrated by use for container image pulls by Docker or CRI-O. A remote attacker can crash the target system, or cause potential code execution for Go applications that use this library under certain conditions during GPG signature verification.