UBUNTU-CVE-2020-7212

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Source
https://ubuntu.com/security/CVE-2020-7212
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-7212.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-7212
Related
Published
2020-03-06T20:15:00Z
Modified
2025-01-13T10:22:09Z
Severity
  • 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
[none]
Details

The encodeinvalidchars function in util/url.py in the urllib3 library 1.25.2 through 1.25.7 for Python allows a denial of service (CPU consumption) because of an inefficient algorithm. The percentencodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percentencodings may be up to O(N). The next step (normalize existing percent-encoded bytes) also takes up to O(N) for each step, so the total time is O(N^2). If percentencodings were deduplicated, the time to compute encodeinvalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).

References

Affected packages

Ubuntu:20.04:LTS / python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/ubuntu/python-urllib3@1.25.8-2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
1.25.8-2

Affected versions

1.*

1.24.1-1ubuntu1
1.24.1-1ubuntu2
1.25.8-1

Ecosystem specific 

{
    "availability": "No subscription required",
    "ubuntu_priority": "medium",
    "binaries": [
        {
            "binary_version": "1.25.8-2",
            "binary_name": "python3-urllib3"
        }
    ]
}