CVE-2020-7212
HIGH7.5EPSS 1.1%Uncontrolled Resource Consumption in urllib3
發布日:2021/4/30修改日:2026/4/28
描述
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).
受影響套件(3)
- Debian/python-urllib3from 0, < 1.25.8-1
- PyPI/urllib3>= 1.25.2, < 1.25.8
- PyPI/urllib3from 0, < a74c9cfbaed9f811e7563cfc3dce894928e0221a | >= 1.25.2, < 1.25.8
CVSS 分數
| 來源 | 版本 | 嚴重程度 | 向量 |
|---|---|---|---|
| osv | CVSS 4.0 | — | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| osv | CVSS 3.1 | HIGH7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H |
參考連結(9)
- ADVISORYhttps://github.com/advisories/GHSA-hmv2-79q8-fv6g
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2020-7212
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2020-7212
- PATCHhttps://github.com/urllib3/urllib3
- PATCHhttps://pypi.org/project/urllib3/1.25.8/
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2020-149.yaml
- WEBhttps://github.com/urllib3/urllib3/blob/master/CHANGES.rst
- WEBhttps://github.com/urllib3/urllib3/commit/a74c9cfbaed9f811e7563cfc3dce894928e0221a
- WEBhttps://pypi.org/project/urllib3/1.25.8