Information disclosure in Python Urllib3
CVE-2023-43804
urllib3 is a user-friendly HTTP client library for Python. urllib3 doesn't treat the `Cookie` HTTP header special or provide any helpers for managing cookies over HTTP, that is the responsibility of the user. However, it is possible for a user to specify a `Cookie` header and unknowingly leak information via HTTP redirects to a different origin if that user doesn't disable redirects explicitly. This issue has been patched in urllib3 version 1.26.17 or 2.0.5.
Vulnerability class: Information Disclosure
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.014 (71.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 71st percentile — 71.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.014 · change: +0.002
Affected products
- Python Urllib3
- Urllib3 — versions >= 2.0.0, < 2.0.6, < 1.26.17
- Debian Linux — versions 10.0
- Fedoraproject Fedora — versions 37, 38, 39
Weakness classification (CWE)
Public proof-of-concept exploits
References
- github.com/urllib3/urllib3/security/advisories/GHSA-v845-jxx5-vc9f (Patch, Vendor Advisory)
- github.com/urllib3/urllib3/commit/01220354d389cd05474713f8c982d05c9b17aafb (Patch)
- github.com/urllib3/urllib3/commit/644124ecd0b6e417c527191f866daa05a5a2056d (Patch)
- lists.debian.org/debian-lts-announce/2023/10/msg00012.html (Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (Mailing List, Third Party Advisory)
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2023-43804?
- CVE-2023-43804 is a medium-severity vulnerability in Python Urllib3, classified under Information Disclosure. CVSS score: 5.9/10. Published 2023-10-04.
- How severe is CVE-2023-43804?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2023-43804 known to be exploited?
- 13 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.