CVE-2021-20208 Privilege escalation in cifs-utils
A container user can access host Kerberos credentials when mounting CIFS, leading to privilege escalation and data compromise.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- A user has to click or open something
- Fix
- Available
What is CVE-2021-20208?
CVE-2021-20208 is a medium-severity vulnerability in Fedoraproject Fedora, published on 19 Apr 2021. It can only be exploited from the same machine or local network, and only if a user opens a file or follows a link.
Official description
A flaw was found in cifs-utils in versions before 6.13. A user when mounting a krb5 CIFS file system from within a container can use Kerberos credentials of the host. The highest threat from this vulnerability is to data confidentiality and integrity.
Which versions are affected by CVE-2021-20208?
It affects 3 products.
Linux distribution packages (4)
cifs-utils SUSE:Linux Enterprise Module for Basesystem 15 SP2 | All versions | 6.9-5.9.1 |
cifs-utils SUSE:Linux Enterprise Server 12 SP5 | All versions | 6.9-13.14.1 |
cifs-utils SUSE:Linux Enterprise Server for SAP Applications 12 SP5 | All versions | 6.9-13.14.1 |
cifs-utils SUSE:Linux Enterprise Software Development Kit 12 SP5 | All versions | 6.9-13.14.1 |
Products include Fedoraproject Fedora, Redhat Enterprise Linux, Samba Cifs-Utils.
How do I fix CVE-2021-20208?
Upgrade to a fixed version.
Is CVE-2021-20208 being exploited?
There is no known exploitation of CVE-2021-20208 in the wild and no public exploit code.
Other vulnerabilities in Fedoraproject Fedora
Sources
Also known as ALPINE-CVE-2021-20208, AZL-6354, DEBIAN-CVE-2021-20208, GHSA-jx7v-8q27-738q, MGASA-2021-0277, OESA-2021-1193 and 3 more.