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Vulnerability of Apache Xerces-C: use after free via External DTD

Synthesis of the vulnerability 

An attacker can force the usage of a freed memory area via External DTD of Apache Xerces-C, in order to trigger a denial of service, and possibly to run code.
Impacted systems: Xerces-C++, RHEL.
Severity of this alert: 3/4.
Creation date: 17/12/2019.
Références of this alert: CVE-2018-1311, RHSA-2020:0702-01, RHSA-2020:0704-01, VIGILANCE-VUL-31169.

Description of the vulnerability 

An attacker can force the usage of a freed memory area via External DTD of Apach...
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This vulnerability note impacts software or systems such as Xerces-C++, RHEL.

Our Vigil@nce team determined that the severity of this cybersecurity vulnerability is important.

The trust level is of type confirmed by the editor, with an origin of document.

An attacker with a expert ability can exploit this computer threat note.

Solutions for this threat 

Fixes for this vulnerability are not yet public.
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