NULL pointer dereference in python-cryptography

1) NULL pointer dereference

EUVDB-ID: #VU87129

Risk: Medium

CVSSv4.0: 6.6 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2024-26130

CWE-ID: CWE-476 - NULL Pointer Dereference

Exploit availability: No

Description

The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to a NULL pointer dereference error within pkcs12.serialize_key_and_certificates when called with a non-matching certificate and private key and an hmac_hash override. A remote attacker can pass specially crafted data to the application and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

python-cryptography: 38.0.0 - 42.0.3

CPE2.3

• cpe:2.3:a:python_cryptographic_authority:python-cryptography:38.0.0:*:*:*:*:*:*:*
• cpe:2.3:a:python_cryptographic_authority:python-cryptography:38.0.1:*:*:*:*:*:*:*
• cpe:2.3:a:python_cryptographic_authority:python-cryptography:38.0.2:*:*:*:*:*:*:*

External links

https://github.com/pyca/cryptography/security/advisories/GHSA-6vqw-3v5j-54x4
https://github.com/pyca/cryptography/pull/10423
https://github.com/pyca/cryptography/commit/97d231672763cdb5959a3b191e692a362f1b9e55

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.