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USN-4466-1: curl vulnerability

19 August 2020

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



  • curl - HTTP, HTTPS, and FTP client and client libraries


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
Ubuntu 18.04
Ubuntu 16.04

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


Related notices

  • USN-4466-2: libcurl3-udeb, curl, libcurl3-gnutls, curl-udeb, libcurl4-doc, libcurl4-nss-dev, libcurl4-openssl-dev, libcurl3-nss, libcurl4-gnutls-dev, libcurl3
  • USN-4665-1: curl, libcurl3-gnutls, libcurl4-doc, libcurl4-nss-dev, libcurl4, libcurl3-nss, libcurl4-gnutls-dev, libcurl4-openssl-dev, libcurl3