USN-5200-1

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Source
https://ubuntu.com/security/notices/USN-5200-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5200-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-5200-1
Upstream
Related
Published
2021-12-17T14:59:29.220066Z
Modified
2025-07-16T08:33:20.292598Z
Summary
python3.7, python3.8 vulnerabilities
Details

It was discovered that the urllib.request.AbstractBasicAuthHandler class in Python contains regex allowing for catastrophic backtracking. Specially crafted traffic from a malicious HTTP server could cause a regular expression denial of service (ReDoS) condition for a client. (CVE-2020-8492)

It was discovered that the urllib.request.AbstractBasicAuthHandler class in Python contains regex with a quadratic worst-case time complexity. Specially crafted traffic from a malicious HTTP server could cause a regular expression denial of service (ReDoS) condition for a client. (CVE-2021-3733)

It was discovered that the Python urllib http client could enter into an infinite loop when incorrectly handling certain server responses (100 Continue response). Specially crafted traffic from a malicious HTTP server could cause a denial of service (DoS) condition for a client. (CVE-2021-3737)

References

Affected packages

Ubuntu:18.04:LTS / python3.7

Package

Name
python3.7
Purl
pkg:deb/ubuntu/python3.7@3.7.5-2ubuntu1~18.04.2?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.7.5-2ubuntu1~18.04.2

Affected versions

3.*

3.7.0~a2-1
3.7.0~a3-1
3.7.0~a3-2
3.7.0~a3-3
3.7.0~a4-1
3.7.0~b1-1
3.7.0~b1-1build1
3.7.0~b2-1
3.7.0~b3-1
3.7.0-1~18.04
3.7.1-1~18.04
3.7.3-2~18.04.1
3.7.5-2~18.04
3.7.5-2~18.04.4

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "idle-python3.7",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.7",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.7-dbg",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.7-dev",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.7-minimal",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.7-stdlib",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.7-testsuite",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.7",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.7-dbg",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.7-dev",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.7-doc",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.7-examples",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.7-minimal",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.7-venv",
            "binary_version": "3.7.5-2ubuntu1~18.04.2"
        }
    ],
    "availability": "No subscription required"
}

Ubuntu:18.04:LTS / python3.8

Package

Name
python3.8
Purl
pkg:deb/ubuntu/python3.8@3.8.0-3ubuntu1~18.04.2?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
3.8.0-3ubuntu1~18.04.2

Affected versions

3.*

3.8.0-3~18.04
3.8.0-3~18.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_name": "idle-python3.8",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.8",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.8-dbg",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.8-dev",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.8-minimal",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.8-stdlib",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "libpython3.8-testsuite",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.8",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.8-dbg",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.8-dev",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.8-examples",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.8-minimal",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        },
        {
            "binary_name": "python3.8-venv",
            "binary_version": "3.8.0-3ubuntu1~18.04.2"
        }
    ],
    "availability": "No subscription required"
}