A curl security update has been released for Ubuntu Linux 14.04 ESM to address an incorrectly handled libcurl CURLOPT_CONNECT_ONLY option.

USN-4466-2: curl vulnerability

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Ubuntu Security Notice USN-4466-2
August 20, 2020

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

- Ubuntu 14.04 ESM

Summary:

curl could be made to expose sensitive information over the network.

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

Details:

USN-4466-1 fixed a vulnerability in curl. This update provides
the corresponding update for Ubuntu 14.04 ESM.

Original advisory details:

Marc Aldorasi discovered that curl incorrectly handled the libcurl
CURLOPT_CONNECT_ONLY option. This could result in data being sent to the
wrong destination, possibly exposing sensitive information.

Update instructions:

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

Ubuntu 14.04 ESM:
curl 7.35.0-1ubuntu2.20+esm5
libcurl3-gnutls 7.35.0-1ubuntu2.20+esm5
libcurl3-nss 7.35.0-1ubuntu2.20+esm5

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

References:
  https://usn.ubuntu.com/4466-2
  https://usn.ubuntu.com/4466-1
CVE-2020-8231