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Vulnerability of PAN-OS: external XML entity injection

Synthesis of the vulnerability 

An attacker can transmit malicious XML data to PAN-OS, in order to read a file, scan sites, or trigger a denial of service.
Vulnerable software: Palo Alto Firewall PA***, PAN-OS.
Severity of this announce: 2/4.
Creation date: 07/12/2017.
Références of this computer vulnerability: CVE-2017-15943, PAN-SA-2017-0026, VIGILANCE-VUL-24691.

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 PAN-OS parser allows external entities.

An attacker can therefore transmit malicious XML data to PAN-OS, in order to read a file, scan sites, or trigger a denial of service.
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This security note impacts software or systems such as Palo Alto Firewall PA***, PAN-OS.

Our Vigil@nce team determined that the severity of this threat announce is medium.

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 weakness announce.

Solutions for this threat 

PAN-OS: fixed versions for XML.
Fixed versions are indicated in information sources.
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