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[FD] [ERPSCAN-16-029] SAP NetWeaver AS JAVA - deserialization of untrusted user value

Application: SAP EP-RUNTIME component

Versions Affected: SAP EP-RUNTIME 7.5

Vendor URL: http://SAP.com

Bugs: Denial of Service

Sent: 22.04.2016

Reported: 23.04.2016

Vendor response: 23.04.2016

Date of Public Advisory: 12.07.2016

Reference: SAP Security Note  2315788

Author:  Mathieu Geli (ERPScan)



Title: [ERPSCAN-16-029] SAP NetWeaver AS JAVA – deserialization of
untrusted user value

Advisory ID: [ERPSCAN-16-029]

Risk: High

Advisory URL: https://erpscan.com/advisories/erpscan-16-029-sap-netweaver-java-7-5-deserialization-untrusted-user-value-trustmanagementservlet/

Date published: 12.17.2016

Vendors contacted: SAP


Class: Denial of Service

Impact: DoS

Remotely Exploitable: Yes

Locally Exploitable: No

CVSS Information

CVSS Base Score v3:  4.9  / 10

CVSS Base Vector:

AV : Attack Vector (Related exploit range) Network (N)

AC : Attack Complexity (Required attack complexity) Low (L)

PR : Privileges Required (Level of privileges needed to exploit) High (H)

UI : User Interaction (Required user participation) None (N)

S : Scope (Change in scope due to impact caused to components beyond
the vulnerable component) Unchanged (U)

C : Impact to Confidentiality None (N)

I : Impact to Integrity None (N)

A : Impact to Availability High (H)


An attacker can use a special HTTP request in order to force a server
to deserialize evil objects, which results in denial of service.


SAP EP-RUNTIME component


To correct this vulnerability, install SAP Security Note  2315788


Mathieu Geli (ERPScan)



Evil object in 'serial.cc3' as an attachment in this bug entry. It was
generated with ysoserial framework, if the commons.collections jar was
in the CLASSPATH we will have direct RCE.

Now, we can only send DoS payloads that will trigger OutOfMemory
exception on 7.5. Payload for that as attachment named 'serial.mem'.

curl -v -XPOST --user 'user:password'
--data-binary @serial.cc3

This request will trigger a series of exceptions in server's log.

The DoS payload will render the server unstable for some minutes with
following exception:

Server process shutting down with exit code [666] memory allocation
error [OutOfMemoryError]
java.lang.OutOfMemoryError: Requested array size exceeds VM limit
(failed to allocate 8589934576 bytes) (array length 2147483639)


Sent: 22.04.2016

Reported: 23.04.2016

Vendor response: 23.04.2016

Date of Public Advisory: 12.07.2016



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