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computer vulnerability note CVE-2017-7503

Red Hat JBoss EAP: external XML entity injection via javax.xml.transform.TransformerFactory

Synthesis of the vulnerability

An attacker can transmit malicious XML data via javax.xml.transform.TransformerFactory to Red Hat JBoss EAP, in order to read a file, scan sites, or trigger a denial of service.
Impacted products: JBoss EAP by Red Hat.
Severity: 2/4.
Creation date: 19/05/2017.
Identifiers: 1451960, CVE-2017-7503, VIGILANCE-VUL-22769.

Description of the vulnerability

XML data can contain external entities (DTD):
  <!ENTITY name SYSTEM "file">
  <!ENTITY name SYSTEM "http://server/file">
A program which reads these XML data can replace these entities by data coming from the indicated file. When the program uses XML data coming from an untrusted source, this behavior leads to:
 - content disclosure from files of the server
 - private web site scan
 - a denial of service by opening a blocking file
This feature must be disabled to process XML data coming from an untrusted source.

However, the Red Hat JBoss EAP parser allows external entities.

An attacker can therefore transmit malicious XML data via javax.xml.transform.TransformerFactory to Red Hat JBoss EAP, in order to read a file, scan sites, or trigger a denial of service.
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