A protobuf-c security update has been released for Ubuntu 20.04 LTS and 22.04 LTS.

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Ubuntu Security Notice USN-5531-1
July 26, 2022

protobuf-c vulnerability
==========================================================================

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

- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in protobuf-c.

Software Description:
- protobuf-c: Protocol Buffers C static library and headers (protobuf-c)

Details:

Pietro Borrello discovered that protobuf-c contained an invalid
arithmetic shift. This vulnerability allowed attackers to cause a
denial of service (system crash) via unspecified vectors
(CVE-2022-33070).

It was discovered that protobuf-c contained an unsigned integer
overflow. This vulnerability allowed attackers to cause a denial of
service (system crash) via unspecified vectors.

Todd Miller discovered that protobuf-c contained a possible NULL
dereference. This could cause a vulnerability that allowed attackers to
cause a denial of service (system crash) via unspecified vectors.

Update instructions:

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

Ubuntu 22.04 LTS:
protobuf-c-compiler 1.3.3-1ubuntu2.1

Ubuntu 20.04 LTS:
protobuf-c-compiler 1.3.3-1ubuntu0.1

In general, a standard system update will make all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-5531-1
CVE-2022-33070

Package Information:
  https://launchpad.net/ubuntu/+source/protobuf-c/1.3.3-1ubuntu2.1
  https://launchpad.net/ubuntu/+source/protobuf-c/1.3.3-1ubuntu0.1