USN-5200-1

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_version": "3.7.5-2ubuntu1~18.04.2",
            "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-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-dev"
        },
        {
            "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"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:18.04:LTS",
    "cves": [
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "low",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2020-8492"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2021-3733"
        },
        {
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ],
            "id": "CVE-2021-3737"
        }
    ]
}

Ubuntu:18.04:LTS / python3.8