CVE-2023-37464

Published: 14 July 2023

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).

Priority

Cvss 3 Severity Score

7.5

Score breakdown

Status

Package	Release	Status
cjose Launchpad, Ubuntu, Debian	trusty	Ignored (end of standard support)
	xenial	Ignored (end of standard support)
	bionic	Released (0.6.0+dfsg1-1ubuntu0.1~esm1) Available with Ubuntu Pro
	lunar	Released (0.6.2.1-1ubuntu0.1)
	upstream	Needs triage
	kinetic	Ignored (end of life, was needed)
	focal	Released (0.6.1+dfsg1-1ubuntu0.1)
	jammy	Released (0.6.1+dfsg1-3ubuntu1.1)

Severity score breakdown

Parameter	Value
Base score	7.5
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	High
Availability impact	None
Vector	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

References

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