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[FD] Onapsis Security Advisory ONAPSIS-2016-002: SAP UCON Security Protection bypass

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 Müller
- 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. Onapsis’ solutions are also the de-facto standard for leading consulting and audit firms such as Accenture, IBM, Deloitte, E&Y, KPMG and PwC.

Onapsis solutions include the Onapsis Security Platform, which is the most widely-used SAP-certified cyber-security solution in the market. Unlike generic security products, Onapsis’ context-aware solutions deliver both preventative vulnerability and compliance controls, as well as real-time detection and incident response capabilities to reduce risks affecting critical business processes and data. Through open interfaces, the platform can be integrated with leading SIEM, GRC and network security products, seamlessly incorporating enterprise applications into existing vulnerability, risk and incident response management programs.

These solutions are powered by the Onapsis Research Labs which continuously provide leading intelligence on security threats affecting SAP and Oracle enterprise applications. Experts of the Onapsis Research Labs were the first to lecture on SAP cyber-attacks and have uncovered and helped fix hundreds of security vulnerabilities to-date affecting SAP Business Suite, SAP HANA, SAP Cloud and SAP Mobile applications, as well as Oracle JD Edwards and Oracle E-Business Suite platforms.

For more information, please visit www.onapsis.com, or connect with us on Twitter, Google+, or LinkedIn.

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