Privilege escalation in Doker



Published: 2019-09-25 | Updated: 2019-11-01
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-16884
CWE-ID CWE-264
Exploitation vector Local
Public exploit N/A
Vulnerable software
Subscribe 		Docker
Server applications / Virtualization software

Docker Engine
Server applications / Virtualization software

Vendor Docker Inc.

Security Bulletin

This security bulletin contains one low risk vulnerability.

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

Install updates from vendor's website.

Vulnerable software versions

Docker: 19.03.0 - 19.03.2

Docker Engine: before 19.03.3

External links

http://github.com/opencontainers/runc/issues/2128
http://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/DGK6IV5JGVDXHOXEKJOJWKOVNZLT6MYR/


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.



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