Red Hat Enterprise Linux 7 Extras update for podman

1) Security restrictions bypass

EUVDB-ID: #VU51017

Risk: Low

CVSSv3.1: 7.7 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-20188

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a local user to escalate privileges on the system.

The vulnerability exists due to file permissions for non-root users running in a privileged container are not correctly checked. A local low-privileged user inside the container can access arbitrary files in the container despite file  permissions, e.g. even files owned by the root user inside the container are accessible.

Successful exploitation of the vulnerability may allow a local user to escalate privileges on the system.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

podman (Red Hat package): 1.6.4-26.el7_9

Red Hat Enterprise Linux for Power, little endian: 7

Red Hat Enterprise Linux for IBM z Systems: 7

Red Hat Enterprise Linux Workstation: 7

Red Hat Enterprise Linux Server: 7

External links

http://access.redhat.com/errata/RHSA-2021:0681

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.