Privilege escalation in Installer for CoreOS disk images



Published: 2021-11-30
Risk Low
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2021-3917
CWE-ID CWE-276
Exploitation vector Local
Public exploit N/A
Vulnerable software
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Installer for CoreOS disk images
Client/Desktop applications / Software for system administration

Vendor CoreOS

Security Bulletin

This security bulletin contains one low risk vulnerability.

1) Incorrect default permissions

EUVDB-ID: #VU58460

Risk: Low

CVSSv3.1: 3.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N/E:U/RL:O/RC:C]

CVE-ID: CVE-2021-3917

CWE-ID: CWE-276 - Incorrect Default Permissions

Exploit availability: No

Description

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

The vulnerability exists due to incorrect default permissions on the "/boot/ignition{,/config.ign}". A local user with access to the system can view contents of files and directories or modify them.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Installer for CoreOS disk images: 0.1.0 - 0.9.1

External links

http://bugzilla.redhat.com/show_bug.cgi?id=2018478


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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