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CVE-2020-36242

Good to know:

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Date: February 7, 2021

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.

Language: Python

Severity Score

Related Resources (19)

https://github.com/pyca/cryptography/security/advisories/GHSA-rhm9-p9w5-fwm7
https://github.com/pypa/advisory-database/tree/main/vulns/cryptography/PYSEC-2021-63.yaml
https://security.alpinelinux.org/vuln/CVE-2020-36242
https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
https://access.redhat.com/security/cve/CVE-2020-36242
https://github.com/pyca/cryptography
https://nvd.nist.gov/vuln/detail/CVE-2020-36242
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
https://github.com/pyca/cryptography/issues/5615
https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E
https://github.com/pyca/cryptography/commit/82b6ce28389f0a317bc55ba2091a74b346db7cae
https://security-tracker.debian.org/tracker/CVE-2020-36242
https://github.com/advisories/GHSA-rhm9-p9w5-fwm7
https://www.oracle.com/security-alerts/cpuapr2022.html
https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
https://www.oracle.com/security-alerts/cpujul2022.html
https://www.mend.io/vulnerability-database/CVE-2020-36242

Severity Score

Weakness Type (CWE)

Integer Overflow or Wraparound

CWE-190

Out-of-bounds Write

CWE-787

Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')

CWE-120

Top Fix

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Upgrade Version

Upgrade to version cryptography - 3.3.2

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): HIGH

CVSS v2

Base Score:
Access Vector (AV): NETWORK
Access Complexity (AC): LOW
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): NONE
Availability (A): PARTIAL
Additional information:

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