In the cryptography package before 3.3.2 for Python, certain sequences of update calls to symmetrically encrypt multi-GB values could result in an integer overflow and buffer overflow, as demonstrated by the Fernet class.
The product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.
| Link | Tags |
|---|---|
| https://github.com/pyca/cryptography/issues/5615 | exploit third party advisory patch |
| https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/ | vendor advisory |
| https://www.oracle.com/security-alerts/cpuapr2022.html | third party advisory patch |
| https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 | third party advisory patch |
| https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst | third party advisory release notes |
| https://www.oracle.com/security-alerts/cpujul2022.html | third party advisory patch |