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Ubuntu Security Notice USN-6641-1
February 19, 2024

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

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

curl could be made to set cookies that would bypass PSL checks.

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

Details:

Harry Sintonen discovered that curl incorrectly handled mixed case cookie
domains. A remote attacker could possibly use this issue to set cookies
that get sent to different and unrelated sites and domains.

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
   curl                            7.58.0-2ubuntu3.24+esm3
   libcurl3-gnutls            7.58.0-2ubuntu3.24+esm3
   libcurl3-nss                7.58.0-2ubuntu3.24+esm3
   libcurl4                       7.58.0-2ubuntu3.24+esm3

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   curl                            7.47.0-1ubuntu2.19+esm11
   libcurl3                       7.47.0-1ubuntu2.19+esm11
   libcurl3-gnutls            7.47.0-1ubuntu2.19+esm11
   libcurl3-nss                7.47.0-1ubuntu2.19+esm11

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

References:
   https://ubuntu.com/security/notices/USN-6641-1
   CVE-2023-46218