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Ubuntu Security Notice USN-6508-2
November 28, 2023

poppler regression
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 18.04 LTS (Available with Ubuntu Pro)

Summary:

USN-6508-1 caused some minor regressions in poppler.

Software Description:
- poppler: PDF rendering library

Details:

USN-6508-1 fixed vulnerabilities in poppler. The update introduced
one minor regression in Ubuntu 18.04 LTS. This update fixes the
problem.

We apologize for the inconvenience.

Original advisory details:

 It was discovered that poppler incorrectly handled certain malformed PDF
 files. If a user or an automated system were tricked into opening a
 specially crafted PDF file, a remote attacker could possibly use this
 issue to cause a denial of service. This issue only affected Ubuntu 16.04
 LTS, Ubuntu 18.04 LTS and Ubuntu 20.04 LTS. (CVE-2020-23804)
 
 It was discovered that poppler incorrectly handled certain malformed PDF
 files. If a user or an automated system were tricked into opening a
 specially crafted PDF file, a remote attacker could possibly use this
 issue to cause a denial of service. (CVE-2022-37050, CVE-2022-37051,
 CVE-2022-37052, CVE-2022-38349)

Update instructions:

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

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
  libpoppler73                    0.62.0-2ubuntu2.14+esm3
  poppler-utils                   0.62.0-2ubuntu2.14+esm3

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

References:
  https://ubuntu.com/security/notices/USN-6508-2
  https://ubuntu.com/security/notices/USN-6508-1
  https://launchpad.net/bugs/2045027