UBUNTU-CVE-2020-36242

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Source
https://ubuntu.com/security/CVE-2020-36242
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-36242.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-36242
Upstream
Withdrawn
2025-07-18T16:46:16Z
Published
2021-02-07T20:15:00Z
Modified
2025-07-16T07:41:36.716585Z
Severity
  • 9.1 (Critical) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

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.

References

Affected packages

Ubuntu:16.04:LTS / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@1.2.3-1ubuntu0.3?arch=source&distro=xenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.2.3-1ubuntu0.3

Affected versions

1.*

1.0.1-1ubuntu1
1.0.2-1
1.1-1
1.1.1-1
1.1.1-1ubuntu1
1.1.1-1ubuntu2
1.1.1-1ubuntu3
1.2.2-2
1.2.3-1
1.2.3-1ubuntu0.1
1.2.3-1ubuntu0.2

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1.2.3-1ubuntu0.3",
            "binary_name": "python-cryptography"
        },
        {
            "binary_version": "1.2.3-1ubuntu0.3",
            "binary_name": "python-cryptography-doc"
        },
        {
            "binary_version": "1.2.3-1ubuntu0.3",
            "binary_name": "python3-cryptography"
        }
    ]
}

Ubuntu:18.04:LTS / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@2.1.4-1ubuntu1.4?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.1.4-1ubuntu1.4

Affected versions

1.*

1.9-1

2.*

2.1.3-3
2.1.4-1
2.1.4-1build1
2.1.4-1build2
2.1.4-1ubuntu1
2.1.4-1ubuntu1.1
2.1.4-1ubuntu1.2
2.1.4-1ubuntu1.3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2.1.4-1ubuntu1.4",
            "binary_name": "python-cryptography"
        },
        {
            "binary_version": "2.1.4-1ubuntu1.4",
            "binary_name": "python-cryptography-dbgsym"
        },
        {
            "binary_version": "2.1.4-1ubuntu1.4",
            "binary_name": "python-cryptography-doc"
        },
        {
            "binary_version": "2.1.4-1ubuntu1.4",
            "binary_name": "python3-cryptography"
        },
        {
            "binary_version": "2.1.4-1ubuntu1.4",
            "binary_name": "python3-cryptography-dbgsym"
        }
    ]
}

Ubuntu:20.04:LTS / python-cryptography

Package

Name
python-cryptography
Purl
pkg:deb/ubuntu/python-cryptography@2.8-3ubuntu0.1?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.8-3ubuntu0.1

Affected versions

2.*

2.6.1-3.1
2.6.1-4
2.6.1-4ubuntu1
2.8-1ubuntu2
2.8-2
2.8-3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2.8-3ubuntu0.1",
            "binary_name": "python-cryptography"
        },
        {
            "binary_version": "2.8-3ubuntu0.1",
            "binary_name": "python-cryptography-dbgsym"
        },
        {
            "binary_version": "2.8-3ubuntu0.1",
            "binary_name": "python-cryptography-doc"
        },
        {
            "binary_version": "2.8-3ubuntu0.1",
            "binary_name": "python3-cryptography"
        },
        {
            "binary_version": "2.8-3ubuntu0.1",
            "binary_name": "python3-cryptography-dbgsym"
        }
    ]
}