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Vulnerability of Dell EMC Avamar: external XML entity injection

Synthesis of the vulnerability 

An attacker can transmit malicious XML data to Dell EMC Avamar, in order to read a file, scan sites, or trigger a denial of service.
Vulnerable software: Avamar.
Severity of this announce: 2/4.
Creation date: 11/10/2019.
Références of this computer vulnerability: CVE-2019-3752, DSA-2019-119, VIGILANCE-VUL-30601.

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 Dell EMC Avamar parser allows external entities.

An attacker can therefore transmit malicious XML data to Dell EMC Avamar, in order to read a file, scan sites, or trigger a denial of service.
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This security weakness impacts software or systems such as Avamar.

Our Vigil@nce team determined that the severity of this threat bulletin 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 threat.

Solutions for this threat 

Dell EMC Avamar: patch for XML External Entity Injection.
A patch is indicated in information sources.
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