Trustwave SpiderLabs Security Advisory TWSL2015-023:
Missing authorization check in SAP Adaptive Server Enterprise

Published: 12/09/2015
Version: 1.0

Vendor: SAP (www.sap.com)
Product: Adaptive Server Enterprise (ASE)
Version affected: 15.7, 16.0

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

Finding 1: Unauthorized system extended stored procedures invocation 
Credit: Martin Rakhmanov of Trustwave 
CVE: CVE-2015-8518

It is possible for users granted CREATE PROCEDURE privilege to invoke 
system stored procedures which they normally do not have access to. 
For example, a user can redefine xp_cmdshell system stored procedure 
in his database and then invoke it:

CREATE PROCEDURE xp_cmdshell (@cmdstr varchar(200)) AS EXTERNAL NAME 'sybsyesp'
GO

Then it can invoke it bypassing normal security checks. It is possible to
override other procedures defined in the sybsyesp as well.

Remediation Steps:
Apply one of these following vendor supplied patches:

SAP ASE 15.7 SP136
SAP ASE Cluster Edition 15.7 SP136
SAP ASE 16.0 SP02 PL01 HF1

Revision History:
09/01/2015 - Vulnerability disclosed to vendor
12/08/2015 - Patch released by vendor
12/09/2015 - Advisory published

References
1. https://websmp230.sap-ag.de/sap/support/notes/2240755


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https://www.trustwave.com/spiderlabs

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