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Vigil@nce - IBM JDK: external XML entity injection

July 2017 by Vigil@nce

This bulletin was written by Vigil@nce : https://vigilance.fr/offer

SYNTHESIS OF THE VULNERABILITY

An attacker can transmit malicious XML data to IBM JDK, in order
to read a file, scan sites, or trigger a denial of service.

Impacted products: AIX, Tivoli System Automation, RHEL, SUSE Linux
Enterprise Desktop, SLES.

Severity: 2/4.

Creation date: 10/05/2017.

DESCRIPTION OF THE VULNERABILITY

XML data can contain external entities (DTD):


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 IBM JDK parser allows external entities.

An attacker can therefore transmit malicious XML data to IBM JDK,
in order to read a file, scan sites, or trigger a denial of
service.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

https://vigilance.fr/vulnerability/IBM-JDK-external-XML-entity-injection-22701


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