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Ubuntu Security Notice USN-5068-1
September 08, 2021

libgd2 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 21.04
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 ESM
- Ubuntu 14.04 ESM

Summary:

Several security issues were fixed in GD library.

Software Description:
- libgd2: GD Graphics Library

Details:

It was discovered that GD Graphics Library incorrectly handled certain GD  and GD2 files.
An attacker could possibly use this issue to cause a crash or expose sensitive information.
This issue only affected Ubuntu 20.04 LTS, Ubuntu 18.04 LTS, Ubuntu 16.04 ESM, and Ubuntu 14.04 ESM.
(CVE-2017-6363)

It was discovered that GD Graphics Library incorrectly handled certain TGA files.
An attacker could possibly use this issue to cause a denial of service or
expose sensitive information. (CVE-2021-381)

It was discovered that GD Graphics Library incorrectly handled certain files.
An attacker could possibly use this issue to cause a crash.
(CVE-2021-40145)

Update instructions:

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

Ubuntu 21.04:
  libgd3                          2.3.0-2ubuntu0.1

Ubuntu 20.04 LTS:
  libgd3                          2.2.5-5.2ubuntu2.1

Ubuntu 18.04 LTS:
  libgd3                          2.2.5-4ubuntu0.5

Ubuntu 16.04 ESM:
  libgd3                          2.1.1-4ubuntu0.16.04.12+esm1

Ubuntu 14.04 ESM:
  libgd3                          2.1.0-3ubuntu0.11+esm2

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

References:
  https://ubuntu.com/security/notices/USN-5068-1
  CVE-2017-6363, CVE-2021-38115, CVE-2021-40145

Package Information:
  https://launchpad.net/ubuntu/+source/libgd2/2.3.0-2ubuntu0.1
  https://launchpad.net/ubuntu/+source/libgd2/2.2.5-5.2ubuntu2.1
  https://launchpad.net/ubuntu/+source/libgd2/2.2.5-4ubuntu0.5