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Ubuntu Security Notice USN-4986-4

Ubuntu Security Notice USN-4986-4
Posted Jun 12, 2021
Authored by Ubuntu | Site security.ubuntu.com

Ubuntu Security Notice 4986-4 - 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. 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. Various other issues were also addressed.

tags | advisory, remote, denial of service
systems | linux, ubuntu
MD5 | e017df85e7106d749ab541aaeb74a8c8

Ubuntu Security Notice USN-4986-4

Change Mirror Download
==========================================================================
Ubuntu Security Notice USN-4986-4
June 10, 2021

rpcbind regression
==========================================================================

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
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