Unauthenticated Information Disclosure in deploy P4 service

Impact On Business

An unauthenticated attacker with access to the P4 port of a java-based SAP solution, would be able to exfiltrate sensitive technical information that could be leveraged for future attacks.

This vulnerability is part of a bigger family named P4CHAINS. This group of bugs may cause more serious consequences and expose systems to worst scenarios. For more information please visit: https://onapsis.com/blog/p4chains-vulnerabilities-where-the-risk-from-the-whole-is-greater-than-the-sum

Affected Components Description

SERVERCORE/CORE-TOOLS/J2EE-FRMW components are a central part of the SAP Netweaver JAVA layer.

As such, every product or solution based on that layer will be affected by this vulnerability.

Some of these products are:

• SAP Enterprise Portal
• SAP Solution Manager
• SAP PI/PO
• SAP Landscape Manager

Vulnerability Details

P4 is a proprietary protocol implemented by SAP in the NetWeaver JAVA stack. In a nutshell, this protocol is based on RMI and CORBA technologies with the goal of providing features for interchanging objects in a remote way. Through, the P4 interface it is possible to access to a bunch of exposed services. All those services are implemented using JAVABeans technology.

Within that list of services, deploy was found. This service provides information of services, applications, libraries, loaders, status of applications, etc that are currently deployed or not in the system. As all functions exposed by this object were not enforcing authentication nor authorization, any anonymous attacker could extract valuable information
for further attacks.

Solution

SAP has released SAP Note 3287784 which provides patched versions of the affected components.

The patches can be downloaded from https://launchpad.support.sap.com/#/notes/3287784.

Onapsis strongly recommends SAP customers to download the related security fixes and apply them to the affected components in order to reduce business risks.

Report Timeline

• 11/21/2022: Vulnerability reported to vendor
• 11/22/2022: Vendor provides incident number
• 04/11/2023: Patch released.

REFERENCES

• Onapsis blogpost: https://onapsis.com/blog/sap-security-patch-day-january-2023
• CVE Mitre: https://nvd.nist.gov/vuln/detail/CVE-2023-0017
• Vendor Patch: https://me.sap.com/notes/3287784/E
• Black Hat Talk: https://www.blackhat.com/us-23/briefings/schedule/#chained-to-hit-discovering-new-vectors-to-gain-remote-and-root-access-in-sap-enterprise-software-31340
• P4chains blogpost: https://onapsis.com/blog/p4chains-vulnerabilities-where-the-risk-from-the-whole-is-greater-than-the-sum