CVE-2021-33503
HIGH7.5EPSS 0.86%Catastrophic backtracking in URL authority parser when passed URL containing many @ characters
發布日:2021/6/1修改日:2026/4/28
描述
An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.
受影響套件(3)
- Debian/python-urllib3from 0, < 1.26.5-1~exp1
- PyPI/urllib3>= 1.25.4, < 1.26.5
- PyPI/urllib3from 0, < 2d4a3fee6de2fa45eb82169361918f759269b4ec | from 0, < 1.26.5
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(12)
- ADVISORYhttps://github.com/advisories/GHSA-q2q7-5pp4-w6pg
- ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2021-33503
- ADVISORYhttps://security-tracker.debian.org/tracker/CVE-2021-33503
- PATCHhttps://github.com/urllib3/urllib3
- WEBhttps://github.com/pypa/advisory-database/tree/main/vulns/urllib3/PYSEC-2021-108.yaml
- WEBhttps://github.com/urllib3/urllib3/commit/2d4a3fee6de2fa45eb82169361918f759269b4ec
- WEBhttps://github.com/urllib3/urllib3/commit/5b047b645f5f93900d5e2fc31230848c25eb1f5f#diff-52026d639119bf1e0364836b4e8a18bd9ed3c95c6ba39b26534a5057a65e35bbR65
- WEBhttps://github.com/urllib3/urllib3/security/advisories/GHSA-q2q7-5pp4-w6pg
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/6SCV7ZNAHS3E6PBFLJGENCDRDRWRZZ6W
- WEBhttps://lists.fedoraproject.org/archives/list/[email protected]/message/FMUGWEAUYGGHTPPXT6YBD53WYXQGVV73
- WEBhttps://security.gentoo.org/glsa/202107-36
- WEBhttps://www.oracle.com/security-alerts/cpuoct2021.html