CVE-2021-3429 sensitive data exposure in cloud-init logs
Local attackers can read world-readable logs to obtain random passwords, enabling unauthorized login as other users.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2021-3429?
CVE-2021-3429 is a medium-severity vulnerability in Canonical Ltd. cloud-init, published on 19 Apr 2023. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
When instructing cloud-init to set a random password for a new user account, versions before 21.2 would write that password to the world-readable log file /var/log/cloud-init-output.log. This could allow a local user to log in as another user.
Weakness: CWE-532
Which versions are affected by CVE-2021-3429?
It affects 1 product.
Linux distribution packages (4)
cloud-init Red Hat:enterprise_linux:8::appstream | All versions | 0:20.3-10.el8_4.5 |
cloud-init Red Hat:rhel_eus:8.1::appstream | All versions | 0:18.5-7.el8_1.6 |
cloud-init Red Hat:rhel_eus:8.2::appstream | All versions | 0:18.5-12.el8_2.10 |
cloud-init Rocky Linux:8 | All versions | 0:20.3-10.el8_4.5 |
Products include Canonical Cloud-Init.
How do I fix CVE-2021-3429?
Upgrade to a fixed version.
Is CVE-2021-3429 being exploited?
There is no known exploitation of CVE-2021-3429 in the wild and no public exploit code.
Other vulnerabilities in Canonical Ltd. cloud-init
Sources
Also known as CLEANSTART-2024-OZ46983, DEBIAN-CVE-2021-3429, DLA-2601-1, GHSA-jj89-4799-j2qv, MGASA-2021-0494, OESA-2021-1372 and 5 more.