A curl security update has been released for Ubuntu Linux 14.04 LTS, 16.04 LTS, and 18.04 LTS.

[USN-6237-3] curl vulnerabilities

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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