Auth bypass in Haxx Libcurl
CVE-2023-27536
An authentication bypass vulnerability exists libcurl <8.0.0 in the connection reuse feature which can reuse previously established connections with incorrect user permissions due to a failure to check for changes in the CURLOPT_GSSAPI_DELEGATION option. This vulnerability affects krb5/kerberos/negotiate/GSSAPI transfers and could potentially result in unauthorized access to sensitive information. The safest option is to not reuse connections if the CURLOPT_GSSAPI_DELEGATION option has been changed.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.016 (74.3th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 74th percentile — 74.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.016 · newest: 0.016 · change: 0.000
Affected products
Weakness classification (CWE)
Public proof-of-concept exploits
References
- hackerone.com/reports/1895135 (Exploit, Third Party Advisory)
- lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/… (vendor-advisory, Mailing List, Third Party Advisory)
- security.netapp.com/advisory/ntap-20230420-0010/ (Third Party Advisory)
- lists.debian.org/debian-lts-announce/2023/04/msg00025.html (mailing-list, Mailing List, Third Party Advisory)
- security.gentoo.org/glsa/202310-12 (vendor-advisory, Third Party Advisory)
Frequently asked questions
- What is CVE-2023-27536?
- CVE-2023-27536 is a medium-severity vulnerability in Haxx Libcurl, classified under Authentication Bypass by Primary Weakness. CVSS score: 5.9/10. Published 2023-03-30.
- How severe is CVE-2023-27536?
- Medium severity. CVSS v3 base score is 5.9 out of 10.
- Is CVE-2023-27536 known to be exploited?
- 4 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.