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Ubuntu Security Notice USN-4986-4
June 10, 2021

rpcbind regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

USN-4986-1 caused a regression in rpcbind.

Software Description:
- rpcbind: converts RPC program numbers into universal addresses

Details:

USN-4986-1 fixed a vulnerability in rpcbind. The update caused a regression
resulting in rpcbind crashing in certain environments. This update fixes
the problem for Ubuntu 14.04 ESM and Ubuntu 16.04 ESM.

Original advisory details:

 It was discovered that rpcbind incorrectly handled certain large data
 sizes. A remote attacker could use this issue to cause rpcbind to consume
 resources, leading to a denial of service.

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 16.04 ESM:
  rpcbind                         0.2.3-0.2ubuntu0.16.04.1+esm2

Ubuntu 14.04 ESM:
  rpcbind                         0.2.1-2ubuntu2.2+esm2

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-4986-4
  https://ubuntu.com/security/notices/USN-4986-1
  https://launchpad.net/bugs/1931507