Onapsis Security Advisory ONAPSIS-2016-002: SAP UCON Security Protection bypass 1. Impact on Business ===================== By exploiting this vulnerability, an attacker could bypass protections implemented in the SAP systems, potentially executing arbitrary business processes. Risk Level: Medium 2. Advisory Information ======================= - Public Release Date: 09/22/2016 - Last Revised: 09/22/2016 - Security Advisory ID: ONAPSIS-2016-002 - Onapsis SVS ID: ONAPSIS-00165 - CVE: CVE-2016-3635 - Researcher: Sergio Abraham and Pablo Muller - Vendor Provided CVSS v2: 6.0 (AV:N/AC:M/Au:S/C:P/I:P/A:P) - Onapsis CVSS v2: 6.0 (AV:N/AC:M/Au:S/C:P/I:P/A:P) 3. Vulnerability Information ============================ - Vendor: SAP AG - Affected Components: SAP Netweaver 7.4 - Vulnerability Class: Improper Access Control (CWE-284) - Remotely Exploitable: Yes - Locally Exploitable: No - Authentication Required: Yes - Original Advisory: https://www.onapsis.com/research/security-advisories/sap-ucon-security-protection-bypass 4. Affected Components Description ================================== In SAP, the Remote Function Modules (RFM) are used to execute remote functions in external systems, where the access control can be enforced by a list that is managed through the Unified Connectivity (UCON) framework. 5. Vulnerability Details ======================== An authenticated user could execute Remote Function Modules (RFM) which are filtered by the Unified Connectivity (UCON) access control list. Those RFMs are in the final phase of UCON implementation and not included in a Communication Assembly (CA). That means that no user (regardless its privileges) should be able to execute those RFMs. The user needs to remotely execute an anonymous RFM included in a Communication Assembly (enabled by UCON), and by leveraging the same connection execute a second RFM which is filtered (not included in a Communication Assembly). As result, the user will be able to execute a RFM that was originally filtered by UCON, completely bypassing the access control list. 6. Solution =========== Implement SAP Security Note 2139366. 7. Report Timeline ================== - 03/03/2015: Onapsis provides vulnerability information to SAP AG. - 05/03/2015: SAP AG confirms reception of vulnerability report. - 10/03/2015: SAP reported fix is In Process. - 14/04/2015: SAP reported fix is In Process. - 12/05/2015: SAP reported fix is In Process. - 09/06/2015: SAP reported fix is In Process. - 09/06/2015: SAP released SAP Security Note 2139366 fixing the vulnerability - 09/22/2016: Onapsis Releases Security Advisory. About Onapsis Research Labs =========================== Onapsis Research Labs provides the industry analysis of key security issues that impact business-critical systems and applications. Delivering frequent and timely security and compliance advisories with associated risk levels, Onapsis Research Labs combine in-depth knowledge and experience to deliver technical and business-context with sound security judgment to the broader information security community. About Onapsis, Inc. =================== Onapsis provides the most comprehensive solutions for securing SAP and Oracle enterprise applications. As the leading experts in SAP and Oracle cyber-security, Onapsis enables security and audit teams to have visibility, confidence and control of advanced threats, cyber-risks and compliance gaps affecting their enterprise applications. Headquartered in Boston, Onapsis serves over 180 Global 2000 customers, including 10 top retailers, 20 top energy firms and 20 top manufacturers. 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