# Onapsis Security Advisory 2021-0017: [Multiple CVEs] Memory Corruption vulnerability in SAP NetWeaver ABAP Enqueue service ## Impact on Business An unauthenticated attacker without specific knowledge of the system can send a specially crafted packet over a network which will trigger an internal error in the system causing the system to crash and rendering it unavailable. ## Advisory Information - Public Release Date: 11/22/2021 - Security Advisory ID: ONAPSIS-2021-0017 - 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 3020104 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-2021-27606 CVE-2021-27629 CVE-2021-27630 CVE-2021-27631 CVE-2021-27632 - Vendor patch Information: SAP Security NOTE 3020104 ## Affected Components Description The SAP Enqueue server is the component that manages the lock table. There is only one ENQ server in a distributed SAP System. It receives a lock request and checks the lock table to determine collision. This is a mandatory service for SAP Netweaver system, whitout it any modification in the SAP system is not possible. ## Vulnerability Details CVE-2021-27606: Attacker can craft malicious enqueue packet to force a read out of memory bound in function `EncOAMParamStore()`. A comparaison value in a loop can be tricked and forced to a high value. Eventually crashed when some relevant register was overwritten. CVE-2021-27629: Attacker can craft malicious enqueue packet to force a read out of memory bound in function `EncPSetUnsupported`. A counter for a movs instruction can be controlled by an attacker leading to a crash. CVE-2021-27630: A NULL pointer dereference exists in `EnqConvUniToSrvReq` when the program tries to calculate the size of part of the message from the input packet. A register points to the content of the packet and could be controlled by the attacker. CVE-2021-27631: A NULL pointer dereference exists in `EnqConvUniToSrvReq` when the program tries to calculate the size of part of the message from the input packet. A register points to the content of the packet and could be controlled by the attacker. CVE-2021-27632: A NULL pointer dereference exists in `EnqConvUniToSrvReq()`, where the function reads inputs from the provided packet then uses them to calculate an offset for a pointer. Both inputs are user controlled, and can lead to dereference a register that will be used in `EnqConvObjToStr`. ## Solution SAP has released SAP Note 3020104 which provide patched versions of the affected components. The patches can be downloaded from https://launchpad.support.sap.com/#/notes/3020104. 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-2021-27606 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27629 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27630 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27631 https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27632 - Vendor Patch: https://launchpad.support.sap.com/#/notes/3020104 ## 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. 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