CVE-2023-28321
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…
Does this matter?
Lower severity and a low EPSS score (1.81%). Track it; it rarely justifies an emergency change on its own.
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 3.1
- 5.9 MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 1.81% probability · 77th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-295
- Affected
- haxx/curl · debian/debian linux · fedoraproject/fedora · netapp/clustered data ontap · netapp/ontap antivirus connector · netapp/h300s firmware · netapp/h500s firmware · netapp/h700s firmware · netapp/h410s firmware · apple/macos
- Source
- support@hackerone.com
References
- http://seclists.org/fulldisclosure/2023/Jul/47Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2023/Jul/48Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2023/Jul/52Mailing List, Third Party Advisory
- https://hackerone.com/reports/1950627Exploit, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/10/msg00016.htmlMailing List, Third Party Advisory
- 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/
- 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 List, Third Party Advisory
- http://seclists.org/fulldisclosure/2023/Jul/48Mailing List, Third Party Advisory
- http://seclists.org/fulldisclosure/2023/Jul/52Mailing List, Third Party Advisory
- https://hackerone.com/reports/1950627Exploit, Patch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/10/msg00016.htmlMailing List, Third Party Advisory
- 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/
- 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.