Improper access control in runc (Alpine package)



Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2019-19921
CWE-ID CWE-284
Exploitation vector Local
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		runc (Alpine package)
Operating systems & Components / Operating system package or component

containerd (Alpine package)
Operating systems & Components / Operating system package or component

Vendor Alpine Linux Development Team

Security Bulletin

This security bulletin contains one low risk vulnerability.

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

Install update from vendor's website.

Vulnerable software versions

runc (Alpine package): 1.0.0-r0 - 1.0.0_rc9-r0

containerd (Alpine package): 1.0.0-r0 - 1.3.4-r1

CPE2.3 External links

http://git.alpinelinux.org/aports/commit/?id=c64d2552678a7126d5e1d18ac54ea0ee126298d9
http://git.alpinelinux.org/aports/commit/?id=76ff73346d335f4b22bc7ec01966172596ac8910
http://git.alpinelinux.org/aports/commit/?id=3b2d519d19eed612aeaf0a62ee9003e23cbe7c2f
http://git.alpinelinux.org/aports/commit/?id=ca936aa88735c8b55f9745593fe8ce90f29bee9a
http://git.alpinelinux.org/aports/commit/?id=2259e688837770f6e1826fd6f550fda6446c4465


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.



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