pyca/cryptography · Security
PyCA Cryptography symmetrically encrypting large values can lead to integer overflow
- GHSA ID
- GHSA-rhm9-p9w5-fwm7
- CVE ID
- CVE-2020-36242
- Severity
- high
- Published
- Updated
- CVSS
- 9.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CVSS v3
- 9.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
- CVSS v4
- 8.8 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:N/VA:H/SC:N/SI:N/SA:N
Description
cryptography is a package designed to expose cryptographic primitives and recipes to Python developers. When certain sequences of update() calls with large values (multiple GBs) for symetric encryption or decryption occur, it's possible for an integer overflow to happen, leading to mishandling of buffers. This is patched in version 3.3.2 and newer.
CWEs
- CWE-190 · Integer Overflow or Wraparound
- CWE-787 · Out-of-bounds Write
References
- https://github.com/pyca/cryptography/security/advisories/GHSA-rhm9-p9w5-fwm7 ↗
- https://nvd.nist.gov/vuln/detail/CVE-2020-36242 ↗
- https://github.com/pyca/cryptography/issues/5615 ↗
- https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst ↗
- https://github.com/pyca/cryptography/commit/82b6ce28389f0a317bc55ba2091a74b346db7cae ↗
- https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 ↗
- https://www.oracle.com/security-alerts/cpuapr2022.html ↗
- https://www.oracle.com/security-alerts/cpujul2022.html ↗
- https://github.com/advisories/GHSA-rhm9-p9w5-fwm7 ↗
- https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-63.yaml ↗
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E ↗
- https://lists.fedoraproject.org/archives/list/[email protected]/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E ↗