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Vulnerability of PAN-OS: external XML entity injection via GlobalProtect

Synthesis of the vulnerability 

An attacker can transmit malicious XML data via GlobalProtect to PAN-OS, in order to read a file, scan sites, or trigger a denial of service.
Vulnerable products: Palo Alto Firewall PA***, PAN-OS.
Severity of this weakness: 2/4.
Creation date: 31/08/2017.
Références of this bulletin: CVE-2017-9458, PAN-SA-2017-0024, VIGILANCE-VUL-23682.

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 via GlobalProtect to PAN-OS, in order to read a file, scan sites, or trigger a denial of service.
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This threat announce impacts software or systems such as Palo Alto Firewall PA***, PAN-OS.

Our Vigil@nce team determined that the severity of this cybersecurity alert 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 security alert.

Solutions for this threat 

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