A curl security update has been released for Ubuntu 18.04 LTS, 20.04 LTS, 22.04 LTS, and 22.10.

USN-5788-1: curl vulnerabilities

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

curl vulnerabilities
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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