[USN-6307-1] JOSE for C/C++ vulnerability

Paulo Flabiano Smorigo pfsmorigo at canonical.com
Thu Aug 24 22:48:01 UTC 2023

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)


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)


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:

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.


Package Information:
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