CVE-2023-28321

Publication date 17 May 2023

Last updated 24 July 2024

Ubuntu priority

Low

Why this priority?

Cvss 3 Severity Score

5.9 · Medium

Score breakdown

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`.

Status

Package Ubuntu Release Status
curl 24.10 oracular
Fixed 7.88.1-10ubuntu1
24.04 LTS noble
Fixed 7.88.1-10ubuntu1
23.10 mantic
Fixed 7.88.1-10ubuntu1
23.04 lunar
Fixed 7.88.1-8ubuntu2.1
22.10 kinetic
Fixed 7.85.0-1ubuntu0.6
22.04 LTS jammy
Fixed 7.81.0-1ubuntu1.11
20.04 LTS focal
Fixed 7.68.0-1ubuntu2.19
18.04 LTS bionic
16.04 LTS xenial
14.04 LTS trusty

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Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
curl

Severity score breakdown

Parameter Value
Base score 5.9 · Medium
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact High
Availability impact None
Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

References

Related Ubuntu Security Notices (USN)

Other references