CVE-2012-0055 Missing authorization in OverlayFS

What is CVE-2012-0055?

CVE-2012-0055 is a high-severity missing authorization vulnerability in Canonical Ubuntu Linux, published on 19 Feb 2020. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

OverlayFS in the Linux kernel before 3.0.0-16.28, as used in Ubuntu 10.0.4 LTS and 11.10, is missing inode security checks which could allow attackers to bypass security restrictions and perform unauthorized actions.

Weakness: CWE-862

Which versions are affected by CVE-2012-0055?

It affects 2 products.

Products include Canonical Ubuntu Linux, Linux kernel.

How do I fix CVE-2012-0055?

No fix has been published for CVE-2012-0055 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2012-0055 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2012-0055 exists.

Public exploit code: 1 Exploit-DB entry.

Other vulnerabilities in Canonical Ubuntu Linux

• CVE-2020-11651 SaltStack Salt Authentication Bypass Exploited Critical 9.8
• CVE-2020-7247 OpenSMTPD Remote Code Execution Exploited Critical 9.8
• CVE-2019-16928 Exim Out-of-bounds Write Exploited Critical 9.8
• CVE-2018-6789 Exim Buffer Overflow Exploited Critical 9.8
• CVE-2015-2590 Oracle Java SE and Java SE Embedded Remote Code Execution Exploited Critical 9.8

All Canonical Ubuntu Linux vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-9h57-rmgj-c639.