On 7th March 2022, we became aware of CVE-2022-0847, also known as "Dirty Pipe". This vulnerability allows an unprivileged local user to write to pages in the page cache backed by read-only files. They could use this to increase their access to the system further by enhancing their privileges.
An optional maintenance update will be made available to all customers which will patch them against this issue and can be implemented using the normal maintenance application functions already in use. Over the next 30 days, the optional update will be made mandatory and rolled out to all customers.
Impact on Aiven Services
The Aiven platform does not allow direct interaction with the underlying operating system. Additionally, Aiven’s architecture prevents cross-tenant impact from vulnerabilities such as this.
Our product and infrastructure security teams have reviewed our existing mitigations in context with this particular vulnerability. Furthermore, internal monitoring has been extended to help identify any exploitation attempts.
For more information about the vulnerability, see CVE-2022-0847.