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Ubuntu Security Notice USN-6307-1

Ubuntu Security Notice 6307-1 - 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 or might expose sensitive information.

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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

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Debian Security Advisory 5472-1

Debian Linux Security Advisory 5472-1 - It was discovered that an incorrect implementation of AES GCM decryption in cjose, a C library implementing the JOSE standard may allow an attacker to provide a truncated Authentication Tag and modify the JWE object.

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OpenIDC/cjose is a C library implementing the Javascript Object Signing and Encryption (JOSE). The AES GCM decryption routine incorrectly uses the Tag length from the actual Authentication Tag provided in the JWE. The spec says that a fixed length of 16 octets must be applied. Therefore this bug allows an attacker to provide a truncated Authentication Tag and to modify the JWE accordingly. Users should upgrade to a version >= 0.6.2.2. Users unable to upgrade should avoid using AES GCM encryption and replace it with another encryption algorithm (e.g. AES CBC).

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