high
7.5
CWE
295
Advisory Published
CVE Published
CVE Published
Updated

CVE-2023-28321

First published: Wed May 10 2023(Updated: )

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`.

Credit: CVE-2023-28319 CVE-2023-28320 CVE-2023-28321 CVE-2023-28322 CVE-2023-28319 CVE-2023-28320 CVE-2023-28321 CVE-2023-28322 CVE-2023-28319 CVE-2023-28320 CVE-2023-28321 CVE-2023-28322 support@hackerone.com support@hackerone.com support@hackerone.com

Affected SoftwareAffected VersionHow to fix
Haxx Curl<8.1.0
ubuntu/curl<8.1.0
8.1.0
ubuntu/curl<7.68.0-1ubuntu2.19
7.68.0-1ubuntu2.19
ubuntu/curl<7.81.0-1ubuntu1.11
7.81.0-1ubuntu1.11
ubuntu/curl<7.85.0-1ubuntu0.6
7.85.0-1ubuntu0.6
ubuntu/curl<7.88.1-8ubuntu2.1
7.88.1-8ubuntu2.1
ubuntu/curl<7.58.0-2ubuntu3.24+
7.58.0-2ubuntu3.24+
ubuntu/curl<7.35.0-1ubuntu2.20+
7.35.0-1ubuntu2.20+
ubuntu/curl<7.47.0-1ubuntu2.19+
7.47.0-1ubuntu2.19+
ubuntu/curl<7.88.1-10ubuntu1
7.88.1-10ubuntu1
Apple macOS Ventura<13.5
13.5
Apple macOS Big Sur<11.7.9
11.7.9
Apple macOS Monterey<12.6.8
12.6.8
redhat/curl<8.1.0
8.1.0
debian/curl<=7.64.0-4+deb10u2
7.64.0-4+deb10u8
7.74.0-1.3+deb11u11
7.88.1-10+deb12u5
8.5.0-2
8.6.0-2
Debian Debian Linux=10.0
Fedoraproject Fedora=37
Fedoraproject Fedora=38
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
Apple macOS>=12.0<12.6.8
Apple macOS>=13.0<13.5
All of
Netapp H300s Firmware
Netapp H300s
All of
Netapp H500s Firmware
Netapp H500s
All of
Netapp H700s Firmware
Netapp H700s
All of
Netapp H410s Firmware
Netapp H410s
IBM Storage Protect for Virtual Environments: Data Protection for VMware<=8.1.0.0 - 8.1.22.0

Remedy

https://hackerone.com/reports/1950627

Remedy

https://github.com/curl/curl/commit/199f2d440d8659b42

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Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Peer vulnerabilities

(Found alongside the following vulnerabilities)

Frequently Asked Questions

  • What is CVE-2023-28321?

    CVE-2023-28321 is an improper certificate validation vulnerability in curl.

  • Which versions of curl are affected by CVE-2023-28321?

    Versions of curl prior to 8.1.0 are affected by CVE-2023-28321.

  • What is the severity of CVE-2023-28321?

    CVE-2023-28321 has a high severity with a CVSS score of 7.

  • How can I fix CVE-2023-28321?

    To fix CVE-2023-28321, update to curl version 8.1.0 or later.

  • Where can I find more information about CVE-2023-28321?

    You can find more information about CVE-2023-28321 at the following references: <ul><li><a href="https://hackerone.com/reports/1950627">HackerOne Report</a></li><li><a href="https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/F4I75RDGX5ULSSCBE5BF3P5I5SFO7ULQ/">Fedora Security Announcement 1</a></li><li><a href="https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z2LIWHWKOVH24COGGBCVOWDXXIUPKOMK/">Fedora Security Announcement 2</a></li></ul>

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