CVE-2016-6144

The SQL interface in SAP HANA before Revision 102 does not limit the number of login attempts for the SYSTEM user when the password_lock_for_system_user is not supported or is configured as False, which makes it easier for remote attackers to bypass authentication via a brute force attack, aka SAP Security Note 2216869.

Weakness

The product does not restrict or incorrectly restricts access to a resource from an unauthorized actor.

Affected Software

Extended Description

Access control involves the use of several protection mechanisms such as:

When any mechanism is not applied or otherwise fails, attackers can compromise the security of the product by gaining privileges, reading sensitive information, executing commands, evading detection, etc. There are two distinct behaviors that can introduce access control weaknesses:

Potential Mitigations

• Compartmentalize the system to have “safe” areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
• Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/19.html
• https://cwe.mitre.org/data/definitions/441.html
• https://cwe.mitre.org/data/definitions/478.html
• https://cwe.mitre.org/data/definitions/479.html
• https://cwe.mitre.org/data/definitions/502.html
• https://cwe.mitre.org/data/definitions/503.html
• https://cwe.mitre.org/data/definitions/536.html
• https://cwe.mitre.org/data/definitions/546.html
• https://cwe.mitre.org/data/definitions/550.html
• https://cwe.mitre.org/data/definitions/551.html
• https://cwe.mitre.org/data/definitions/552.html
• https://cwe.mitre.org/data/definitions/556.html
• https://cwe.mitre.org/data/definitions/558.html
• https://cwe.mitre.org/data/definitions/562.html
• https://cwe.mitre.org/data/definitions/563.html
• https://cwe.mitre.org/data/definitions/564.html
• https://cwe.mitre.org/data/definitions/578.html

References

• http://packetstormsecurity.com/files/138443/SAP-HANA-DB-1.00.73.00.389160-SYSTEM-User-Brute-Force.html
• http://seclists.org/fulldisclosure/2016/Aug/91
• http://www.securityfocus.com/bid/92065
• https://www.onapsis.com/blog/onapsis-publishes-15-advisories-sap-hana-and-building-components
• https://www.onapsis.com/research/security-advisories/sap-hana-system-user-brute-force-attack