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Ubuntu Security Notice USN-5438-1
May 23, 2022

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS

Summary:

HTMLDOC could be made to crash or run programs if it received specially
crafted HTML files.

Software Description:
- htmldoc: HTML processor that generates indexed HTML, PS, and PDF

Details:

It was discovered that HTMLDOC did not properly manage memory under certain
circumstances. If a user were tricked into opening a specially crafted HTML
file, a remote attacker could possibly use this issue to cause HTMLDOC to
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 20.04 LTS:
htmldoc 1.9.7-1ubuntu0.3
htmldoc-common 1.9.7-1ubuntu0.3

Ubuntu 18.04 LTS:
htmldoc 1.9.2-1ubuntu0.2
htmldoc-common 1.9.2-1ubuntu0.2

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

References:
https://ubuntu.com/security/notices/USN-5438-1
CVE-2021-23165

Package Information:
https://launchpad.net/ubuntu/+source/htmldoc/1.9.7-1ubuntu0.3
https://launchpad.net/ubuntu/+source/htmldoc/1.9.2-1ubuntu0.2