Vulnerability Description
An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wildcard patterns when listed as "Subject Alternative Name" in TLS server certificates. curl can be built to use its own name matching function for TLS rather than one provided by a TLS library. This private wildcard matching function would match IDN (International Domain Name) hosts incorrectly and could as a result accept patterns that otherwise should mismatch. IDN hostnames are converted to puny code before used for certificate checks. Puny coded names always start with `xn--` and should not be allowed to pattern match, but the wildcard check in curl could still check for `x*`, which would match even though the IDN name most likely contained nothing even resembling an `x`.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Haxx | Curl | < 8.1.0 |
| Debian | Debian Linux | 10.0 |
| Fedoraproject | Fedora | 37 |
| Netapp | Clustered Data Ontap | - |
| Netapp | Ontap Antivirus Connector | - |
| Netapp | H300S Firmware | - |
| Netapp | H300S | - |
| Netapp | H500S Firmware | - |
| Netapp | H500S | - |
| Netapp | H700S Firmware | - |
| Netapp | H700S | - |
| Netapp | H410S Firmware | - |
| Netapp | H410S | - |
| Apple | Macos | >= 11.0, < 11.7.9 |
Related Weaknesses (CWE)
References
- http://seclists.org/fulldisclosure/2023/Jul/47Mailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2023/Jul/48Mailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2023/Jul/52Mailing ListThird Party Advisory
- https://hackerone.com/reports/1950627ExploitPatchThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/10/msg00016.htmlMailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://security.gentoo.org/glsa/202310-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20230609-0009/Third Party Advisory
- https://support.apple.com/kb/HT213843Third Party Advisory
- https://support.apple.com/kb/HT213844Third Party Advisory
- https://support.apple.com/kb/HT213845Third Party Advisory
- http://seclists.org/fulldisclosure/2023/Jul/47Mailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2023/Jul/48Mailing ListThird Party Advisory
- http://seclists.org/fulldisclosure/2023/Jul/52Mailing ListThird Party Advisory
FAQ
What is CVE-2023-28321?
CVE-2023-28321 is a vulnerability with a CVSS score of 5.9 (MEDIUM). An improper certificate validation vulnerability exists in curl <v8.1.0 in the way it supports matching of wildcard patterns when listed as "Subject Alternative Name" in TLS server certificates. curl ...
How severe is CVE-2023-28321?
CVE-2023-28321 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2023-28321?
Check the references section above for vendor advisories and patch information. Affected products include: Haxx Curl, Debian Debian Linux, Fedoraproject Fedora, Netapp Clustered Data Ontap, Netapp Ontap Antivirus Connector.