Mariano Nuñez Di Croce has reported some vulnerabilities in SAP RFC Library, which can be exploited by malicious people to disclose potentially sensitive information, cause a DoS (Denial of Service), and compromise a vulnerable system.

1) The "RFC_SET_REG_SERVER_PROPERTY" RFC function allows to define the exclusive use of the RFC Server. This can be exploited to cause a DoS by denying access to other clients.

2) An unspecified buffer overflow exists within the "SYSTEM_CREATE_INSTANCE" RFC function, which can be exploited to execute arbitrary code.

3) An unspecified buffer overflow exists within the "RFC_START_GUI" RFC function, which can be exploited to execute arbitrary code.

4) Two unspecified errors exist within the "RFC_START_PROGRAM" RFC function. These can be exploited to gain knowledge about the RFC server's configuration or execute arbitrary code.

5) An error within the "TRUSTED_SYSTEM_SECURITY" function can be exploited to gain knowledge about existing user accounts and groups on a RFC server.

The vulnerabilities are reported in SAP RFC Library versions 6.40 and 7.00. Other versions may also be affected.

Solution
Reportedly, SAP released patches.

Provided and/or discovered by
Mariano Nuñez Di Croce

Changelog
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Original Advisory
http://www.cybsec.com/vuln/CYBSEC-Security_Advisory_SAP_RFC_SET_REG_SERVER_PROPERTY_RFC_Function_Denial_of_Service.pdf
http://www.cybsec.com/vuln/CYBSEC-Security_Advisory_SAP_RFC_START_GUI_RFC_Function_Buffer_Overflow.pdf
http://www.cybsec.com/vuln/CYBSEC-Security_Advisory_SAP_RFC_START_PROGRAM_RFC_Function_Multiple_Vulnerabilities.pdf
http://www.cybsec.com/vuln/CYBSEC-Security_Advisory_SAP_SYSTEM_CREATE_INSTANCE_RFC_Function_Buffer_Overflow.pdf
http://www.cybsec.com/vuln/CYBSEC-Security_Advisory_SAP_TRUSTED_SYSTEM_SECURITY_RFC_Function_Information_Disclosure.pdf

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