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Ubuntu Security Notice USN-6237-2
July 19, 2023

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

- Ubuntu 22.04 LTS

Summary:

USN-6237-1 introduced a regression in curl.

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

Details:

USN-6237-1 fixed vulnerabilities in curl. The update caused a certificate
wildcard handling regression on Ubuntu 22.04 LTS. This update fixes the
problem.

We apologize for the inconvenience.

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 22.04 LTS:
   curl                            7.81.0-1ubuntu1.13
   libcurl3-gnutls                 7.81.0-1ubuntu1.13
   libcurl3-nss                    7.81.0-1ubuntu1.13
   libcurl4                        7.81.0-1ubuntu1.13

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

References:
   https://ubuntu.com/security/notices/USN-6237-2
   https://ubuntu.com/security/notices/USN-6237-1
   https://launchpad.net/bugs/2028170

Package Information:
   https://launchpad.net/ubuntu/+source/curl/7.81.0-1ubuntu1.13