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CVE-2024-33663

Algorithm confusion in python-jose with OpenSSH ECDSA keys (CVE-2022-29217).

  • CVSS 6.5
  • CWE-327
  • Cryptographic
  • Remote

python-jose through 3.3.0 has algorithm confusion with OpenSSH ECDSA keys and other key formats. This is similar to CVE-2022-29217.

CVE
CVE-2024-33663
CWE
CWE-327
CVSS base score
6.5
Published
2024-04-26
OWASP
A05 Security Misconfiguration
Orthogonal defect classification
Algorithm
Code defect classification
Incorrect Algorithm
Category
Cryptographic
Subcategory
Cryptographic Implementation Error
Accessibility scope
Remote
Impact
Unauthorized Access
Affected component
python-jose
Fixed by upgrading
Yes

Solution

Upgrade python-jose to version 3.3.1 or later.

Vulnerable code sample

from jose import jwt

def verify_jwt(token, public_key):
    """Vulnerable function that demonstrates the security issue."""
    try:
        payload = jwt.decode(token, public_key)
        return payload
    except jwt.JWTError as e:
        print(f"JWT verification failed: {e}")
        return None

public_key = "-----BEGIN PUBLIC KEY-----\nYOUR_PUBLIC_KEY_HERE\n-----END PUBLIC KEY-----"
token = "YOUR_JWT_HERE"
payload = verify_jwt(token, public_key)

Patched code sample

from jose import jwt

def verify_jwt(token, public_key):
    """Secure function that fixes the vulnerability."""
    try:
        payload = jwt.decode(token, public_key, algorithms=['ES256'])
        return payload
    except jwt.JWTError as e:
        print(f"JWT verification failed: {e}")
        return None

public_key = "-----BEGIN PUBLIC KEY-----\nYOUR_PUBLIC_KEY_HERE\n-----END PUBLIC KEY-----"
token = "YOUR_JWT_HERE"
payload = verify_jwt(token, public_key)

Payload

{
  "alg": "none",
  "sub": "1234567890",
  "name": "John Doe",
  "iat": 1516239022
}

Cite this entry

@misc{vaitp:cve202433663,
  title        = {{Algorithm confusion in python-jose with OpenSSH ECDSA keys (CVE-2022-29217).}},
  author       = {Bogaerts, Fr\'ed\'eric and Ivaki, Naghmeh and Fonseca, Jos\'e},
  year         = {2024},
  note         = {VAITP Python Vulnerability Dataset, entry CVE-2024-33663},
  howpublished = {\url{https://netpack.pt/vaitp/vulnerability/CVE-2024-33663/}}
}
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