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A curl regression update has been released for Ubuntu Linux 22.04 LTS.

[USN-6237-2] curl regression

Ubuntu Security Notice USN-6237-2
July 19, 2023

curl regression

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 22.04 LTS


USN-6237-1 introduced a regression in curl.

Software Description:
- curl: HTTP, HTTPS, and FTP client and client libraries


USN-6237-1 fixed vulnerabilities in curl. The update caused a certificate
wildcard handling regression on Ubuntu 22.04 LTS. This update fixes the

We apologize for the inconvenience.

Original advisory details:

Hiroki Kurosawa discovered that curl incorrectly handled validating certain
certificate wildcards. A remote attacker could possibly use this issue to
spoof certain website certificates using IDN hosts. (CVE-2023-28321)
Hiroki Kurosawa discovered that curl incorrectly handled callbacks when
certain options are set by applications. This could cause applications
using curl to misbehave, resulting in information disclosure, or a denial
of service. (CVE-2023-28322)
It was discovered that curl incorrectly handled saving cookies to files. A
local attacker could possibly use this issue to create or overwrite files.
This issue only affected Ubuntu 22.10, and Ubuntu 23.04. (CVE-2023-32001)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 22.04 LTS:
curl 7.81.0-1ubuntu1.13
libcurl3-gnutls 7.81.0-1ubuntu1.13
libcurl3-nss 7.81.0-1ubuntu1.13
libcurl4 7.81.0-1ubuntu1.13

In general, a standard system update will make all the necessary changes.


Package Information: