USN-5138-1

The py.path.svnwc component of py (aka python-py) through v1.9.0 contains a regular expression with an ambiguous subpattern that is susceptible to catastrophic backtracing. This could be used by attackers to cause a compute-time denial of service attack by supplying malicious input to the blame functionality.

References

Affected packages

Ubuntu:18.04:LTS / python-py

Package

Name: python-py
Purl: pkg:deb/ubuntu/python-py@1.5.2-1ubuntu0.1?arch=source&distro=bionic

Affected ranges

Type: ECOSYSTEM
Events: Introduced

0Unknown introduced version / All previous versions are affected

Fixed

1.5.2-1ubuntu0.1

Affected versions

1.*

1.4.34-2ubuntu1

1.4.34-3

1.5.2-1

Ecosystem specific

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "1.5.2-1ubuntu0.1",
            "binary_name": "pypy-py"
        },
        {
            "binary_version": "1.5.2-1ubuntu0.1",
            "binary_name": "python-py"
        },
        {
            "binary_version": "1.5.2-1ubuntu0.1",
            "binary_name": "python3-py"
        }
    ]
}

Database specific

source

"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-5138-1.json"

cves_map

{
    "cves": [
        {
            "id": "CVE-2020-29651",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:18.04:LTS"
}

Ubuntu:20.04:LTS / python-py