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Ubuntu Security Notice USN-6237-1
July 19, 2023

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

- Ubuntu 23.04
- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS

Summary:

Several security issues were fixed in curl.

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

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 23.04:
   curl                            7.88.1-8ubuntu2.1
   libcurl3-gnutls                 7.88.1-8ubuntu2.1
   libcurl3-nss                    7.88.1-8ubuntu2.1
   libcurl4                        7.88.1-8ubuntu2.1

Ubuntu 22.10:
   curl                            7.85.0-1ubuntu0.6
   libcurl3-gnutls                 7.85.0-1ubuntu0.6
   libcurl3-nss                    7.85.0-1ubuntu0.6
   libcurl4                        7.85.0-1ubuntu0.6

Ubuntu 22.04 LTS:
   curl                            7.81.0-1ubuntu1.11
   libcurl3-gnutls                 7.81.0-1ubuntu1.11
   libcurl3-nss                    7.81.0-1ubuntu1.11
   libcurl4                        7.81.0-1ubuntu1.11

Ubuntu 20.04 LTS:
   curl                            7.68.0-1ubuntu2.19
   libcurl3-gnutls                 7.68.0-1ubuntu2.19
   libcurl3-nss                    7.68.0-1ubuntu2.19
   libcurl4                        7.68.0-1ubuntu2.19

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

References:
   https://ubuntu.com/security/notices/USN-6237-1
   CVE-2023-28321, CVE-2023-28322, CVE-2023-32001

Package Information:
   https://launchpad.net/ubuntu/+source/curl/7.88.1-8ubuntu2.1
   https://launchpad.net/ubuntu/+source/curl/7.85.0-1ubuntu0.6
   https://launchpad.net/ubuntu/+source/curl/7.81.0-1ubuntu1.11
   https://launchpad.net/ubuntu/+source/curl/7.68.0-1ubuntu2.19