En bref
- CVE-2020-7212 est une vulnérabilité ÉLEVÉE (CVSS 7.5) touchant urllib3, urllib3 (python).
- Probabilité d'exploitation dans les 30 prochains jours (EPSS) : 3.4%, plus élevée que 88.8% des vulnérabilités.
- Correctif : mettre à jour vers 1.25.8 ou plus récent.
| Package | Affected versions | Patched versions |
|---|
| urllib3 PyPI | ≥ 1.25.2, < 1.25.8
| 1.25.8
|
| urllib3 | ≥ 1.25.2, ≤ 1.25.7
| No fix yet |
Description
The _encode_invalid_chars 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 percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings 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 percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
NVD description
The _encode_invalid_chars 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 percent_encodings array contains all matches of percent encodings. It is not deduplicated. For a URL of length N, the size of percent_encodings 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 percent_encodings were deduplicated, the time to compute _encode_invalid_chars would be O(kN), where k is at most 484 ((10+6*2)^2).
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