Ubuntu Security Notice USN-6277-1

==========================================================================Ubuntu Security Notice USN-6277-1August 08, 2023php-dompdf vulnerabilities==========================================================================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 converterDetails:It was discovered that Dompdf was not properly validating untrusted input whenprocessing HTML content under certain circumstances. An attacker couldpossibly use this issue to expose sensitive information or execute arbitrarycode. 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 HTMLcontent that referenced PHAR files, which could result in the deserializationof untrusted data. An attacker could possibly use this issue to executearbitrary code. (CVE-2021-3838)It was discovered that Dompdf was not properly validating processed HTMLcontent that referenced both a remote base and a local file, which couldresult in the bypass of a chroot check. An attacker could possibly use thisissue to expose sensitive information. (CVE-2022-2400)Update instructions:The problem can be corrected by updating your system to the followingpackage versions:Ubuntu 20.04 LTS:php-dompdf 0.6.2+dfsg-3ubuntu0.20.04.1Ubuntu 18.04 LTS (Available with Ubuntu Pro):php-dompdf 0.6.2+dfsg-3ubuntu0.18.04.1~esm1Ubuntu 16.04 LTS (Available with Ubuntu Pro):php-dompdf 0.6.1+dfsg-2ubuntu1+esm1In general, a standard system update will make all the necessary changes.References:https://ubuntu.com/security/notices/USN-6277-1CVE-2014-5011, CVE-2014-5012, CVE-2014-5013, CVE-2021-3838,CVE-2022-2400Package Information:https://launchpad.net/ubuntu/+source/php-dompdf/0.6.2+dfsg-3ubuntu0.20.04.1