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Ubuntu Security Notice USN-6237-3
September 11, 2023

curl vulnerabilities
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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)
- Ubuntu 14.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in curl.

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

Details:

USN-6237-1 fixed several vulnerabilities in curl. This update provides the
corresponding updates for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, and
Ubuntu 18.04 LTS.

Original advisory 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 18.04 LTS (Available with Ubuntu Pro):
   curl                            7.58.0-2ubuntu3.24+esm1
   libcurl3-gnutls                 7.58.0-2ubuntu3.24+esm1
   libcurl3-nss                    7.58.0-2ubuntu3.24+esm1
   libcurl4                        7.58.0-2ubuntu3.24+esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
   curl                            7.47.0-1ubuntu2.19+esm9
   libcurl3                        7.47.0-1ubuntu2.19+esm9
   libcurl3-gnutls                 7.47.0-1ubuntu2.19+esm9
   libcurl3-nss                    7.47.0-1ubuntu2.19+esm9

Ubuntu 14.04 LTS (Available with Ubuntu Pro):
   curl                            7.35.0-1ubuntu2.20+esm16
   libcurl3                        7.35.0-1ubuntu2.20+esm16
   libcurl3-gnutls                 7.35.0-1ubuntu2.20+esm16
   libcurl3-nss                    7.35.0-1ubuntu2.20+esm16

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

References:
   https://ubuntu.com/security/notices/USN-6237-3
   https://ubuntu.com/security/notices/USN-6237-1
   CVE-2023-28321, CVE-2023-28322