Ubuntu update for runC

Published: 2020-03-10

Risk	Low
Patch available	YES
Number of vulnerabilities	2
CVE-ID	CVE-2019-16884 CVE-2019-19921
CWE-ID	CWE-264 CWE-284
Exploitation vector	Local
Public exploit	Public exploit code for vulnerability #2 is available.
Vulnerable software Subscribe	runc (Ubuntu package) Operating systems & Components / Operating system package or component
Vendor	Canonical Ltd.

Security Bulletin

This security bulletin contains information about 2 vulnerabilities.

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU22482

Risk: Low

CVSSv3.1: 5.3 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2019-16884

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 incorrect checking of the mount targets in libcontainer/rootfs_linux.go in runc. A local user can bypass AppArmor restrictions and perform unauthorized actions on the system, as demonstrated by overwriting the /proc directory with a malicious Doker image.

Mitigation

Update the affected packages.

Ubuntu 19.10: runc - 1.0.0~rc10-0ubuntu1~19.10.2
Ubuntu 18.04 LTS: runc - 1.0.0~rc10-0ubuntu1~18.04.2

Vulnerable software versions

runc (Ubuntu package): 1.0.0~rc1-0ubuntu1 - 1.0.0~rc8-0ubuntu1

External links

http://usn.ubuntu.com/4297-1/

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.

2) 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