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Ubuntu Security Notice USN-4665-2
December 09, 2020

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

- Ubuntu 14.04 ESM
- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in curl.

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

Details:

USN-4665-1 fixed several vulnerabilities in curl. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

 Varnavas Papaioannou discovered that curl incorrectly handled FTP PASV
 responses. An attacker could possibly use this issue to trick curl into
 connecting to an arbitrary IP address and be used to perform port scanner
 and other information gathering. (CVE-2020-8284)

 It was discovered that curl incorrectly handled FTP wildcard matchins. A
 remote attacker could possibly use this issue to cause curl to consume
 resources and crash, resulting in a denial of service. (CVE-2020-8285)

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+esm6
  libcurl3                        7.35.0-1ubuntu2.20+esm6
  libcurl3-gnutls                 7.35.0-1ubuntu2.20+esm6
  libcurl3-nss                    7.35.0-1ubuntu2.20+esm6

Ubuntu 12.04 ESM:
  curl                            7.22.0-3ubuntu4.29
  libcurl3                        7.22.0-3ubuntu4.29
  libcurl3-gnutls                 7.22.0-3ubuntu4.29
  libcurl3-nss                    7.22.0-3ubuntu4.29

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

References:
  https://usn.ubuntu.com/4665-2
  https://usn.ubuntu.com/4665-1
  CVE-2020-8284, CVE-2020-8285