// For flags

CVE-2023-37464

Incorrect Authentication Tag length usage in AES GCM decryption in OpenIDC/cjose

Severity Score

7.5
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

Attend
*SSVC
Descriptions

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).

OpenIDC/cjose es una biblioteca C que implementa Javascript Object Signing and Encryption (JOSE). La rutina de descifrado AES GCM utiliza incorrectamente la longitud de la etiqueta de la etiqueta de autenticación real proporcionada en el JWE. La especificación dice que se debe aplicar una longitud fija de 16 octetos. Por lo tanto, este error permite a un atacante proporcionar una etiqueta de autenticación truncada y modificar el JWE en consecuencia. Los usuarios deben actualizar a una versión >= 0.6.2.2. Los usuarios que no puedan actualizar deben evitar el uso del cifrado AES GCM y reemplazarlo con otro algoritmo de cifrado (por ejemplo, AES CBC).

A vulnerability was found in cjose. The 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 JSON Web Encryption (JWE). A fixed length of 16 octets must be applied. This flaw allows an attacker to provide a truncated Authentication Tag and modify the JWE.

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Changed
Confidentiality
None
Integrity
High
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:Attend
Exploitation
None
Automatable
Yes
Tech. Impact
Partial
* Organization's Worst-case Scenario
Timeline
  • 2023-07-06 CVE Reserved
  • 2023-07-14 CVE Published
  • 2024-10-18 EPSS Updated
  • 2024-10-30 CVE Updated
  • 2024-10-30 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-327: Use of a Broken or Risky Cryptographic Algorithm
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Cisco
Search vendor "Cisco"
 Cjose
Search vendor "Cisco" for product "Cjose"
 < 0.6.2.2
Search vendor "Cisco" for product "Cjose" and version " < 0.6.2.2"
-
Affected