Vigil@nce - SAP NetWeaver AS Java: external XML entity injection
November 2014 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
An attacker can transmit malicious XML data to SAP NetWeaver AS
Java, in order to read a file, scan sites, or trigger a denial of
service.
Impacted products: SAP ERP, NetWeaver
Severity: 2/4
Creation date: 24/10/2014
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 SAP NetWeaver AS Java parser allows external entities.
An attacker can therefore transmit malicious XML data to SAP
NetWeaver AS Java, in order to read a file, scan sites, or trigger
a denial of service.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/SAP-NetWeaver-AS-Java-external-XML-entity-injection-15535