Amazon Linux AMI update for runc

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:

src:
    runc-1.0.0-0.1.20200204.gitdc9208a.1.amzn1.src

x86_64:
    runc-1.0.0-0.1.20200204.gitdc9208a.1.amzn1.x86_64
    runc-debuginfo-1.0.0-0.1.20200204.gitdc9208a.1.amzn1.x86_64

Vulnerable software versions

Amazon Linux AMI: All versions

External links

http://alas.aws.amazon.com/ALAS-2021-1556.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.