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Ubuntu Security Notice USN-3860-2
January 15, 2019

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

- Ubuntu 12.04 ESM

Summary:

Several security issues were fixed in libcaca.

Software Description:
- libcaca: text mode graphics utilities

Details:

USN-3860-1 fixed a vulnerability in libcaca. This update provides
the corresponding update for Ubuntu 12.04 ESM.

Original advisory details:

 It was discovered that libcaca incorrectly handled certain images.
 An attacker could possibly use this issue to cause a denial of
 service. (CVE-2018-20544)

 It was discovered that libcaca incorrectly handled certain images.
 An attacker could possibly use this issue to execute arbitrary code.
 (CVE-2018-20545, CVE-2018-20548, CVE-2018-20459)

 It was discovered that libcaca incorrectly handled certain images.
 An attacker could possibly use this issue to access sensitive
 information. (CVE-2018-20546, CVE-2018-20547)

Update instructions:

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

Ubuntu 12.04 ESM:
  caca-utils                      0.99.beta17-2.1ubuntu2.1
  libcaca0                        0.99.beta17-2.1ubuntu2.1

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

References:
  https://usn.ubuntu.com/usn/usn-3860-2
  https://usn.ubuntu.com/usn/usn-3860-1
  CVE-2018-20544, CVE-2018-20545, CVE-2018-20546, CVE-2018-20547,
  CVE-2018-20548, CVE-2018-20549