A curl security update has been released for Ubuntu Linux 20.04 LTS, 18.04 LTS, and 16.04 LTS.

USN-4466-1: curl vulnerability

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Ubuntu Security Notice USN-4466-1
August 19, 2020

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS

Summary:

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

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

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 20.04 LTS:
curl 7.68.0-1ubuntu2.2
libcurl3-gnutls 7.68.0-1ubuntu2.2
libcurl3-nss 7.68.0-1ubuntu2.2
libcurl4 7.68.0-1ubuntu2.2

Ubuntu 18.04 LTS:
curl 7.58.0-2ubuntu3.10
libcurl3-gnutls 7.58.0-2ubuntu3.10
libcurl3-nss 7.58.0-2ubuntu3.10
libcurl4 7.58.0-2ubuntu3.10

Ubuntu 16.04 LTS:
curl 7.47.0-1ubuntu2.16
libcurl3 7.47.0-1ubuntu2.16
libcurl3-gnutls 7.47.0-1ubuntu2.16
libcurl3-nss 7.47.0-1ubuntu2.16

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

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

Package Information:
  https://launchpad.net/ubuntu/+source/curl/7.68.0-1ubuntu2.2
  https://launchpad.net/ubuntu/+source/curl/7.58.0-2ubuntu3.10
  https://launchpad.net/ubuntu/+source/curl/7.47.0-1ubuntu2.16