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Apache Flex BlazeDS Insecure Xml Entity Expansion Vulnerability

🗓️ 20 Aug 2015 00:00:00Reported by Christofer DutzType 
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 zdt
🔗 0day.today👁 102 Views

Apache Flex BlazeDS Insecure Xml Entity Expansion Vulnerability CVE-2015-326

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CVE-2015-3269 Apache Flex BlazeDS Insecure Xml Entity Expansion Vulnerability

Severity: Important

Vendor: The Apache Software Foundation

Versions Affected: Apache Flex BlazeDS 4.7.0

Description: When receiving XML encoded AMF messages containing DTD entities, the default XML parser configurations allows expanding of entities to local resources. A request that included a specially crafted request parameter could be used to

access content that would otherwise be protected.


Mitigation: All users of Apache Flex BlazeDS prior to 4.7.1

Example: For an AMF message that contains the following xml payload:
<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE foo [
<!ELEMENT foo ANY >
<!ENTITY xxe SYSTEM "file:///etc/passwd" >]><foo>&xxe;</foo>
the entity &xxe; would be expanded to the content of the file /etc/passwd.
However this expanded information is not automatically transferred back to
the client, but could be made available by the application.

Credit: This issue was discovered by Matthias Kaiser of Code White

References: https://www.owasp.org/index.php/XML_External_Entity_(XXE)_Processing


Christofer Dutz

#  0day.today [2018-04-02]  #

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20 Aug 2015 00:00Current
6.4Medium risk
Vulners AI Score6.4
EPSS0.13331
102