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Ubuntu Security Notice USN-6718-2
March 27, 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 denial of service.

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

Details:

USN-6718-1 fixed a vulnerability in curl. This update provides
the corresponding update for Ubuntu 16.04 LTS and Ubuntu 18.04 LTS.

Original advisory details:

 It was discovered that curl incorrectly handled memory when limiting the
 amount of headers when HTTP/2 server push is allowed. A remote attacker
 could possibly use this issue to cause curl to consume resources, leading
 to a denial of service. (CVE-2024-2398)

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+esm4
  libcurl3-gnutls                 7.58.0-2ubuntu3.24+esm4
  libcurl3-nss                    7.58.0-2ubuntu3.24+esm4
  libcurl4                        7.58.0-2ubuntu3.24+esm4

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
  curl                            7.47.0-1ubuntu2.19+esm12
  libcurl3                        7.47.0-1ubuntu2.19+esm12
  libcurl3-gnutls                 7.47.0-1ubuntu2.19+esm12
  libcurl3-nss                    7.47.0-1ubuntu2.19+esm12

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

References:
  https://ubuntu.com/security/notices/USN-6718-2
  https://ubuntu.com/security/notices/USN-6718-1
  CVE-2024-2398