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Ubuntu Security Notice USN-4957-2
May 18, 2021

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

- Ubuntu 16.04 ESM

Summary:

Several security issues were fixed in DjVuLibre.

Software Description:
- djvulibre: DjVu image format library and tools

Details:

USN-4957-1 fixed several vulnerabilities in DjVuLibre. This update provides
the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

 It was discovered that DjVuLibre incorrectly handled certain memory
 operations. If a user or automated system were tricked into processing a
 specially crafted DjVu file, a remote attacker could cause applications
 to hang or crash, resulting in a denial of service, or possibly execute
 arbitrary code.

Update instructions:

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

Ubuntu 16.04 ESM:
  libdjvulibre21                  3.5.27.1-5ubuntu0.1+esm1

After a standard system update you need to reboot your computer to make
all the necessary changes.

References:
  https://ubuntu.com/security/notices/USN-4957-2
  https://ubuntu.com/security/notices/USN-4957-1
  CVE-2021-32490, CVE-2021-32491, CVE-2021-32492, CVE-2021-32493,
  CVE-2021-3500