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Apache Flex BlazeDS 4.7.1 SSRF

Apache Flex BlazeDS 4.7.1 SSRF
Posted Nov 23, 2015
Authored by Christofer Dutz

Apache Flex BlazeDS versions 4.7.0 and 4.7.1 suffer from a server-side request forgery vulnerability.

tags | exploit
advisories | CVE-2015-5255
SHA-256 | 0005b6103d499d01523afeee675b0ec07725b42b1b1468d91a6d3b6c8f9096ae

Apache Flex BlazeDS 4.7.1 SSRF

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CVE-2015-5255: SSRF vulnerability in Apache Flex BlazeDS 4.7.1
Severity: Important
Vendor: The Apache Software Foundation
Versions Affected: BlazeDS 4.7.0 and 4.7.1
Description: The code in BlazeDS to deserialize AMF XML datatypes allows
so-called SSRF Attacks
(Server Side Request Forgery) in which the server could contact a remote
service on
behalf of the attacker. The attacker could hereby circumvent firewall
restrictions.
Mitigation: 4.7.x users should upgrade to 4.7.2
Example: For XML object containing the following string representation:

<!DOCTYPE foo PUBLIC "-//VSR//PENTEST//EN"
"http://protected-server/protected-service"><foo>Some content</foo>
The server could access the url:
http://protected-server/protected-service

Even if directly accessing this resource is prevented by firewall rules.

Credit: This issue was discovered by James Kettle of PortSwigger Ltd.
References:
http://www.vsecurity.com/download/papers/XMLDTDEntityAttacks.pdf

Christofer Dutz
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