Improper Certificate Validation Affecting curl package, versions <7.88.1-8ubuntu2.1
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Test your applications- Snyk ID SNYK-UBUNTU2304-CURL-5561952
- published 18 May 2023
- disclosed 26 May 2023
Introduced: 18 May 2023
CVE-2023-28321 Open this link in a new tabHow to fix?
Upgrade Ubuntu:23.04 curl to version 7.88.1-8ubuntu2.1 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Ubuntu.
See How to fix? for Ubuntu:23.04 relevant fixed versions and status.
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.
References
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2023-28321
- https://hackerone.com/reports/1950627
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/F4I75RDGX5ULSSCBE5BF3P5I5SFO7ULQ/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/Z2LIWHWKOVH24COGGBCVOWDXXIUPKOMK/
- https://security.netapp.com/advisory/ntap-20230609-0009/
- https://support.apple.com/kb/HT213843
- https://support.apple.com/kb/HT213844
- https://support.apple.com/kb/HT213845
- http://seclists.org/fulldisclosure/2023/Jul/47
- http://seclists.org/fulldisclosure/2023/Jul/48
- http://seclists.org/fulldisclosure/2023/Jul/52
- https://lists.debian.org/debian-lts-announce/2023/10/msg00016.html
- https://security.gentoo.org/glsa/202310-12
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/F4I75RDGX5ULSSCBE5BF3P5I5SFO7ULQ/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/Z2LIWHWKOVH24COGGBCVOWDXXIUPKOMK/