9.1
CRITICAL
CVE-2020-36242
Python Fernet Cryptography Buffer Overflow Vulnerability
Description

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.

INFO

Published Date :

Feb. 7, 2021, 8:15 p.m.

Last Modified :

Nov. 21, 2024, 5:29 a.m.

Source :

[email protected]

Remotely Exploitable :

Yes !

Impact Score :

5.2

Exploitability Score :

3.9
Public PoC/Exploit Available at Github

CVE-2020-36242 has a 5 public PoC/Exploit available at Github. Go to the Public Exploits tab to see the list.

Affected Products

The following products are affected by CVE-2020-36242 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Fedoraproject fedora
1 Oracle communications_cloud_native_core_network_function_cloud_native_environment
1 Cryptography_project cryptography
1 Cryptography.io cryptography
: Total Affected Vendor : 4 | Products : 4
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2020-36242.

URL Resource
https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst Release Notes Third Party Advisory
https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 Patch Third Party Advisory
https://github.com/pyca/cryptography/issues/5615 Exploit Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
https://www.oracle.com/security-alerts/cpuapr2022.html Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html Patch Third Party Advisory
https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst Release Notes Third Party Advisory
https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 Patch Third Party Advisory
https://github.com/pyca/cryptography/issues/5615 Exploit Patch Third Party Advisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
https://www.oracle.com/security-alerts/cpuapr2022.html Patch Third Party Advisory
https://www.oracle.com/security-alerts/cpujul2022.html Patch Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Profile Photo
agoel111/jake

None

Python Dockerfile

Updated: 3 months, 3 weeks ago
0 stars 0 fork 0 watcher
Born at : Aug. 20, 2024, 7:20 a.m. This repo has been linked 3 different CVEs too.
Profile Photo
CodeAnt-AI/jake

None

Dockerfile Python

Updated: 3 months, 3 weeks ago
0 stars 1 fork 1 watcher
Born at : Aug. 10, 2024, 6:10 p.m. This repo has been linked 3 different CVEs too.
Profile Photo
AdiRashkes/python-tda-bug-hunt-2

None

Updated: 1 year, 11 months ago
0 stars 0 fork 0 watcher
Born at : Dec. 15, 2022, 10:16 a.m. This repo has been linked 4 different CVEs too.
Profile Photo
indece-official/clair-client

Command line client for quay/clair v4.x.x

clair clair-scanner docker security-tools security docker-security

Makefile Go

Updated: 2 years, 8 months ago
1 stars 0 fork 0 watcher
Born at : April 21, 2021, 7:48 p.m. This repo has been linked 6 different CVEs too.
Profile Photo
sonatype-nexus-community/jake

Check your Python environments for vulnerable Open Source packages with OSS Index or Sonatype Nexus Lifecycle.

python vulnerabilities vulnerability-scanners ossindex nexus-iq sonatype-iq

Python Dockerfile

Updated: 1 month, 1 week ago
114 stars 23 fork 23 watcher
Born at : Oct. 10, 2019, 8:05 p.m. This repo has been linked 3 different CVEs too.

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2020-36242 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2020-36242 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst
    Added Reference https://github.com/pyca/cryptography/compare/3.3.1...3.3.2
    Added Reference https://github.com/pyca/cryptography/issues/5615
    Added Reference https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
    Added Reference https://www.oracle.com/security-alerts/cpuapr2022.html
    Added Reference https://www.oracle.com/security-alerts/cpujul2022.html
  • CPE Deprecation Remap by [email protected]

    Sep. 05, 2024

    Action Type Old Value New Value
    Changed CPE Configuration OR *cpe:2.3:a:cryptography_project:cryptography:*:*:*:*:*:python:*:* versions from (excluding) 3.3.2 OR *cpe:2.3:a:cryptography.io:cryptography:*:*:*:*:*:python:*:* versions from (excluding) 3.3.2
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Nov. 07, 2023

    Action Type Old Value New Value
    Added Reference MITRE https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/ [No types assigned]
    Removed Reference MITRE https://lists.fedoraproject.org/archives/list/[email protected]/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/
  • Modified Analysis by [email protected]

    Dec. 06, 2022

    Action Type Old Value New Value
    Changed Reference Type https://www.oracle.com/security-alerts/cpujul2022.html No Types Assigned https://www.oracle.com/security-alerts/cpujul2022.html Patch, Third Party Advisory
  • CVE Modified by [email protected]

    Jul. 25, 2022

    Action Type Old Value New Value
    Added Reference https://www.oracle.com/security-alerts/cpujul2022.html [No Types Assigned]
  • Modified Analysis by [email protected]

    May. 12, 2022

    Action Type Old Value New Value
    Changed Reference Type https://www.oracle.com/security-alerts/cpuapr2022.html No Types Assigned https://www.oracle.com/security-alerts/cpuapr2022.html Patch, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:oracle:communications_cloud_native_core_network_function_cloud_native_environment:1.10.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Apr. 20, 2022

    Action Type Old Value New Value
    Added Reference https://www.oracle.com/security-alerts/cpuapr2022.html [No Types Assigned]
  • CWE Remap by [email protected]

    Jul. 21, 2021

    Action Type Old Value New Value
    Changed CWE CWE-190 CWE-120 CWE-190 CWE-787
  • Modified Analysis by [email protected]

    Feb. 19, 2021

    Action Type Old Value New Value
    Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/ Mailing List, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    Feb. 12, 2021

    Action Type Old Value New Value
    Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/L7RGQLK4J5ZQFRLKCHVVG6BKZTUQMG7E/ [No Types Assigned]
  • Initial Analysis by [email protected]

    Feb. 09, 2021

    Action Type Old Value New Value
    Added CVSS V2 NIST (AV:N/AC:L/Au:N/C:P/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
    Changed Reference Type https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst No Types Assigned https://github.com/pyca/cryptography/blob/master/CHANGELOG.rst Release Notes, Third Party Advisory
    Changed Reference Type https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 No Types Assigned https://github.com/pyca/cryptography/compare/3.3.1...3.3.2 Patch, Third Party Advisory
    Changed Reference Type https://github.com/pyca/cryptography/issues/5615 No Types Assigned https://github.com/pyca/cryptography/issues/5615 Exploit, Patch, Third Party Advisory
    Added CWE NIST CWE-190
    Added CWE NIST CWE-120
    Added CPE Configuration OR *cpe:2.3:a:cryptography_project:cryptography:*:*:*:*:*:python:*:* versions up to (excluding) 3.3.2
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2020-36242 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2020-36242 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.56 }} -0.28%

score

0.77615

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
: