Vulnerability Monitor

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CVE-2020-36242

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.

Published

2021-02-07T20:15:12.090

Last Modified

2024-11-21T05:29:08.287

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 9.1 (CRITICAL)

CVSSv2 Vector

AV:N/AC:L/Au:N/C:P/I:N/A:P

Access Vector: NETWORK
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: NONE
Availability Impact: PARTIAL

Exploitability Score

10.0

Impact Score

4.9

Weaknesses

Type: Primary
CWE-190
CWE-787

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	cryptography.io	cryptography	< 3.3.2	Yes
Operating System	fedoraproject	fedora	33	Yes
Application	oracle	communications_cloud_native_core_network_function_cloud_native_environment	1.10.0	Yes

References

https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst Release Notes, Third Party Advisory ([email protected])
https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 Patch, Third Party Advisory ([email protected])
https://github.com/pyca/cryptography/issues/5615 Exploit, Patch, Third Party Advisory ([email protected])
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/ ([email protected])
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory ([email protected])
https://www.oracle.com/security-alerts/cpujul2022.html Patch, Third Party Advisory ([email protected])
https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst Release Notes, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/pyca/cryptography/issues/5615 Exploit, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/ (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.oracle.com/security-alerts/cpujul2022.html Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)