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Ubuntu Security Notice USN-6277-1
August 08, 2023

php-dompdf vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS (Available with Ubuntu Pro)
- Ubuntu 16.04 LTS (Available with Ubuntu Pro)

Summary:

Several security issues were fixed in Dompdf.

Software Description:
- php-dompdf: HTML to PDF converter

Details:

It was discovered that Dompdf was not properly validating untrusted input when
processing HTML content under certain circumstances. An attacker could
possibly use this issue to expose sensitive information or execute arbitrary
code. This issue only affected Ubuntu 16.04 LTS.
(CVE-2014-5011, CVE-2014-5012, CVE-2014-5013)

It was discovered that Dompdf was not properly validating processed HTML
content that referenced PHAR files, which could result in the deserialization
of untrusted data. An attacker could possibly use this issue to execute
arbitrary code. (CVE-2021-3838)

It was discovered that Dompdf was not properly validating processed HTML
content that referenced both a remote base and a local file, which could
result in the bypass of a chroot check. An attacker could possibly use this
issue to expose sensitive information. (CVE-2022-2400)

Update instructions:

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

Ubuntu 20.04 LTS:
php-dompdf 0.6.2+dfsg-3ubuntu0.20.04.1

Ubuntu 18.04 LTS (Available with Ubuntu Pro):
php-dompdf 0.6.2+dfsg-3ubuntu0.18.04.1~esm1

Ubuntu 16.04 LTS (Available with Ubuntu Pro):
php-dompdf 0.6.1+dfsg-2ubuntu1+esm1

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

References:
https://ubuntu.com/security/notices/USN-6277-1
CVE-2014-5011, CVE-2014-5012, CVE-2014-5013, CVE-2021-3838,
CVE-2022-2400

Package Information:
https://launchpad.net/ubuntu/+source/php-dompdf/0.6.2+dfsg-3ubuntu0.20.04.1