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Ubuntu Security Notice USN-3993-2
May 22, 2019

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

– Ubuntu 14.04 ESM
– Ubuntu 12.04 ESM

Summary:

curl could be made to crash if it received a specially crafted data.

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

Details:

USN-3993-1 fixed a vulnerability in curl. This update provides
the corresponding update for Ubuntu 12.04 ESM and Ubuntu 14.04 ESM.

Original advisory details:

It was discovered that curl incorrectly handled memory when receiving
data from a TFTP server. A remote attacker could use this issue to
cause curl to crash, resulting in a denial of service, or possibly
execute arbitrary code. (CVE-2019-5436)

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+esm2
libcurl3 7.35.0-1ubuntu2.20+esm2
libcurl3-gnutls 7.35.0-1ubuntu2.20+esm2
libcurl3-nss 7.35.0-1ubuntu2.20+esm2

Ubuntu 12.04 ESM:
curl 7.22.0-3ubuntu4.26
libcurl3 7.22.0-3ubuntu4.26
libcurl3-gnutls 7.22.0-3ubuntu4.26
libcurl3-nss 7.22.0-3ubuntu4.26

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

References:
https://usn.ubuntu.com/usn/usn-3993-2
https://usn.ubuntu.com/usn/usn-3993-1
CVE-2019-5436