=========================================================================Ubuntu Security Notice USN-5788-1
January 05, 2023

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

- Ubuntu 22.10
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 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 HSTS support
when certain hostnames included IDN characters. A remote attacker could
possibly use this issue to cause curl to use unencrypted connections. This
issue only affected Ubuntu 22.04 LTS, and Ubuntu 22.10. (CVE-2022-43551)

It was discovered that curl incorrectly handled denials when using HTTP
proxies. A remote attacker could use this issue to cause curl to crash,
resulting in a denial of service, or possibly execute arbitrary code.
(CVE-2022-43552)

Update instructions:

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

Ubuntu 22.10:
   curl                            7.85.0-1ubuntu0.2
   libcurl3-gnutls                 7.85.0-1ubuntu0.2
   libcurl3-nss                    7.85.0-1ubuntu0.2
   libcurl4                        7.85.0-1ubuntu0.2

Ubuntu 22.04 LTS:
   curl                            7.81.0-1ubuntu1.7
   libcurl3-gnutls                 7.81.0-1ubuntu1.7
   libcurl3-nss                    7.81.0-1ubuntu1.7
   libcurl4                        7.81.0-1ubuntu1.7

Ubuntu 20.04 LTS:
   curl                            7.68.0-1ubuntu2.15
   libcurl3-gnutls                 7.68.0-1ubuntu2.15
   libcurl3-nss                    7.68.0-1ubuntu2.15
   libcurl4                        7.68.0-1ubuntu2.15

Ubuntu 18.04 LTS:
   curl                            7.58.0-2ubuntu3.22
   libcurl3-gnutls                 7.58.0-2ubuntu3.22
   libcurl3-nss                    7.58.0-2ubuntu3.22
   libcurl4                        7.58.0-2ubuntu3.22

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

References:
   https://ubuntu.com/security/notices/USN-5788-1
   CVE-2022-43551, CVE-2022-43552

Package Information:
   https://launchpad.net/ubuntu/+source/curl/7.85.0-1ubuntu0.2
   https://launchpad.net/ubuntu/+source/curl/7.81.0-1ubuntu1.7
   https://launchpad.net/ubuntu/+source/curl/7.68.0-1ubuntu2.15
   https://launchpad.net/ubuntu/+source/curl/7.58.0-2ubuntu3.22