ID

VAR-202106-1816

CVE

CVE-2021-27597

TITLE

SAP NetWeaver AS for ABAP  Input confirmation vulnerability

DESCRIPTION

SAP NetWeaver AS for ABAP (RFC Gateway), versions - KRNL32NUC - 7.22,7.22EXT, KRNL64NUC - 7.22,7.22EXT,7.49, KRNL64UC - 8.04,7.22,7.22EXT,7.49,7.53,7.73, KERNEL - 7.22,8.04,7.49,7.53,7.73,7.77,7.81,7.82,7.83, allows an unauthenticated attacker without specific knowledge of the system to send a specially crafted packet over a network which will trigger an internal error in the system due to improper input validation in method memmove() causing the system to crash and rendering it unavailable. In this attack, no data in the system can be viewed or modified. SAP NetWeaver AS for ABAP (RFC Gateway) Is vulnerable to input validation.Denial of service (DoS) It may be put into a state. SAP NetWeaver AS ABAP Business Server is an application server suitable for ABAP (Advanced Business Application Programming) from SAP company in Germany. SAP NetWeaver AS ABAP Business Server has a security vulnerability, which stems from a memory corruption vulnerability in NetWeaver ABAP Server and ABAP Platform. Attackers can use this vulnerability to use multiple vulnerabilities in SAP products. ## Advisory Information - Public Release Date: 11/22/2021 - Security Advisory ID: ONAPSIS-2021-0018 - Researcher(s): Yvan Genuer ## Vulnerability Information - Vendor: SAP - Affected Components: All SAP kernel 32 and 64 bits, unicode and no-unicode - SAP KERNEL 7.22 - SAP KERNEL 7.22EXT - SAP KERNEL 7.49 - SAP KERNEL 7.53 - SAP KERNEL 7.73 - SAP KERNEL 7.77 - SAP KERNEL 7.81 - SAP KERNEL 8.04 (Check SAP Note 3020209 for detailed information on affected releases) - Vulnerability Class: CWE-20, CWE-125, CWE-476 - CVSS v3 score: 7.5 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Risk Level: High - Assigned CVE: CVE-2021-27597 CVE-2021-27633 CVE-2021-27634 - Vendor patch Information: SAP Security NOTE 3020209 ## Affected Components Description The SAP Gateway server is the component that manages the communication between SAP system and the rest of the world. This is a mandatory service for SAP Netweaver system, whitout it any background communication to the system is not possible, make the system useless. The source pointer is calculated partially with attacker controlled inputs. When this `GW_REQ*` pointer’s is used again in `GwSearchConn()`, to get another offset, it leads to unattended behavior or crash. An attacker can craft a malicious RFC packet to reach a particular part of function `ThrtHdlAppc()`, where inputs, after a few modifications, are sent to disp+work with `ThSAPCMSEND()`. Leading it to crash in `ThCPIC()`. In normal workload, RFC requests received by the gwrd are forwarded to a work process type DIA to perform an ABAP task. These requests are stored in `pendingRequests` part in memory. An attacker can craft a valid RFC packet and force the service to store malicious entry in `pendingRequests` aera. Leading the disp+work to crash. ## Solution SAP has released SAP Note 3020209 which provide patched versions of the affected components. The patches can be downloaded from https://launchpad.support.sap.com/#/notes/3020209. 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 - MM-DD-YYYY: - 02/01/2021: Onapsis sends details to SAP - 02/04/2021: SAP provides internal ID - 02/08/2021: SAP confirms CVSS - 06/09/2021: SAP releases SAP Note fixing the issue. - 11/22/2021: Advisory published ## References - Onapsis blogpost: https://www.onapsis.com/blog/sap-security-patch-day-june-2021-multiple-memory-corruption-vulnerabilities-can-lead-system - CVE Mitre: https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27597 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27633 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27634 - Vendor Patch: https://launchpad.support.sap.com/#/notes/3020209 ## 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. Find all reported vulnerabilities at https://github.com/Onapsis/vulnerability_advisories ## About Onapsis, Inc. Onapsis protects the mission-critical applications that run the global economy, from the core to the cloud. The Onapsis Platform uniquely delivers actionable insight, secure change, automated governance and continuous monitoring for critical systems—ERP, CRM, PLM, HCM, SCM and BI applications—from leading vendors such as SAP, Oracle, Salesforce and others, while keeping them protected and compliant. For more information, connect with us on Twitter or LinkedIn, or visit us at https://www.onapsis.com. ## License This advisory is licensed under a [Creative Commons 4.0 BY-ND International License](https://creativecommons.org/licenses/by-nd/4.0/legalcode) <br><br><img src="../../images/license_cc.png" align="left" height="36" width="112" > -- This email and any files transmitted with it are confidential and intended solely for the use of the individual or entity to whom they are addressed. If you have received this email in error please notify the system manager. This message contains confidential information and is intended only for the individual named. If you are not the named addressee you should not disseminate, distribute or copy this e-mail. Please notify the sender immediately by e-mail if you have received this e-mail by mistake and delete this e-mail from your system. 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IOT TAXONOMY

AFFECTED PRODUCTS

CVSS

PROBLEMTYPE DATA

THREAT TYPE

remote

TYPE

buffer error

PATCH

EXTERNAL IDS

REFERENCES

CREDITS

Yvan Genuer

SOURCES

LAST UPDATE DATE

2024-08-14T14:31:42.068000+00:00

SOURCES UPDATE DATE

SOURCES RELEASE DATE