CVE-2021-3733
⚪ Do wiadomości
Błąd w klasie AbstractBasicAuthHandler w urllib może prowadzić do odmowy usługi przez atak ReDOS.
CVSS
6.5
EPSS
4.7%
Exploit
poc
Vendor
redhat
Opis źródłowy (NVD)
There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.
dos exploit
Brak patcha
Źródła i daty
| Źródło | Wartość |
|---|---|
| NVD – CVSS | 6.5 |
| CISA KEV (aktywnie wykorzystywane) | Nie |
| FIRST EPSS (prawdopodobieństwo exploita) | 4.7% |
| Opublikowano (NVD) | 2022-03-10 17:42:59 UTC |
| Ostatnia modyfikacja (NVD) | 2026-10-08 21:17:41 UTC |
Referencje
- https://bugs.python.org/issue43075 ([email protected]) [Exploit, Issue Tracking, Patch, Vendor Advisory]
- https://bugzilla.redhat.com/show_bug.cgi?id=1995234 ([email protected]) [Issue Tracking, Third Party Advisory]
- https://github.com/python/cpython/commit/7215d1ae25525c92b026166f9d5cac85fb ([email protected]) [Patch, Third Party Advisory]
- https://github.com/python/cpython/pull/24391 ([email protected]) [Patch, Third Party Advisory]
- https://lists.debian.org/debian-lts-announce/2023/05/msg00024.html ([email protected])
- https://lists.debian.org/debian-lts-announce/2023/06/msg00039.html ([email protected])
- https://security.netapp.com/advisory/ntap-20220407-0001/ ([email protected]) [Third Party Advisory]
- https://ubuntu.com/security/CVE-2021-3733 ([email protected]) [Patch, Third Party Advisory]
- https://lists.debian.org/debian-lts-announce/2024/12/msg00000.html (af854a3a-2127-422b-91ae-364da2661108)