==========================================================================
Ubuntu Security Notice USN-6307-1
August 24, 2023

cjose vulnerability
==========================================================================

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

- Ubuntu 23.04
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

Summary:

JOSE for C/C++ could be made to crash if it received specially crafted input.

Software Description:
- cjose: C library implementing the JOSE standard (development files)

Details:

It was discovered that JOSE for C/C++ AES GCM decryption routine incorrectly
uses the Tag length from the actual Authentication Tag provided in the JWE.
An attacker could use this to cause a denial of service (system crash) or
might expose sensitive information.

Update instructions:

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

Ubuntu 23.04:
  libcjose0                       0.6.2.1-1ubuntu0.1

Ubuntu 22.04 LTS:
  libcjose0                       0.6.1+dfsg1-3ubuntu1.1

Ubuntu 20.04 LTS:
  libcjose0                       0.6.1+dfsg1-1ubuntu0.1

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  libcjose0                       0.6.0+dfsg1-1ubuntu0.1~esm1

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

References:
  https://ubuntu.com/security/notices/USN-6307-1
  CVE-2023-37464

Package Information:
  https://launchpad.net/ubuntu/+source/cjose/0.6.2.1-1ubuntu0.1
  https://launchpad.net/ubuntu/+source/cjose/0.6.1+dfsg1-3ubuntu1.1
  https://launchpad.net/ubuntu/+source/cjose/0.6.1+dfsg1-1ubuntu0.1