🛡️ CVE-2023-28321
🟡 CVSS 5.9 — Medium ⚠️ Exploit Public CWE-295 NVD
5.9
CVSS Score
0 Low4 Medium7 High9 Critical10

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`.

Details

Severity MEDIUM
CVSS Score 5.9
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE CWE-295
Public Exploit ⚠️ Yes
Source NVD
Published 2023-05-26
Updated 2026-06-08
Modified 2025-01-15

Affected Packages

Software From version Fixed in
clustered-data-ontap
curl 8.1.0
debian-linux
fedora
h300s-firmware
h410s-firmware
h500s-firmware
h700s-firmware
macos 13.0 13.5
ontap-antivirus-connector

References

Mailing List, Third Party Advisory http://seclists.org/fulldisclosure/2023/Jul/47
Mailing List, Third Party Advisory http://seclists.org/fulldisclosure/2023/Jul/48
Mailing List, Third Party Advisory http://seclists.org/fulldisclosure/2023/Jul/52
Exploit, Patch, Third Party Advisory https://hackerone.com/reports/1950627
Mailing List, Third Party Advisory http://seclists.org/fulldisclosure/2023/Jul/47
Mailing List, Third Party Advisory http://seclists.org/fulldisclosure/2023/Jul/48
Mailing List, Third Party Advisory http://seclists.org/fulldisclosure/2023/Jul/52
Exploit, Patch, Third Party Advisory https://hackerone.com/reports/1950627

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