Missing Cryptographic Step Affecting cryptography package, versions [,41.0.5)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-CRYPTOGRAPHY-6036192
- published26 Oct 2023
- disclosed24 Oct 2023
- creditTony Battersby of Cybernetics
Introduced: 24 Oct 2023
CVE-2023-5363 (opens in a new tab)How to fix?
Upgrade cryptography to version 41.0.5 or higher.
Overview
Affected versions of this package are vulnerable to Missing Cryptographic Step when the EVP_EncryptInit_ex2(), EVP_DecryptInit_ex2() or EVP_CipherInit_ex2() functions are used. An attacker can cause truncation or overreading of key and initialization vector (IV) lengths by altering the "keylen" or "ivlen" parameters within the OSSL_PARAM array after the key and IV have been established. This can lead to potential truncation or overruns during the initialization of some symmetric ciphers, such as RC2, RC4, RC5, CCM, GCM, and OCB. A truncation in the IV can result in non-uniqueness, which could result in loss of confidentiality for some cipher modes.
Both truncations and overruns of the key and the IV will produce incorrect results and could, in some cases, trigger a memory exception.