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CVE-2022-22536: SAP Patches Internet Communication Manager Advanced Desync (ICMAD) Vulnerabilities

SAP and Onapsis Research Labs collaborate to disclose three critical vulnerabilities impacting SAP NetWeaver Application Servers. The most severe of the three could lead to full system takeover.

Background

On February 8, SAP disclosed several vulnerabilities in the Internet Communication Manager (ICM), a critical component of its NetWeaver Application Servers in coordination with security researchers at Onapsis who discovered the flaws. SAP and Onapsis have both released write-ups regarding their partnership to discover and patch these flaws. The Cybersecurity and Infrastructure Security Agency also issued an immediate warning about these vulnerabilities, stating that exploitation could result in disrupted operations, data theft, fraud and ransomware attacks.

SAP Netweaver is an application and integration server that acts as the software stack for most of SAP’s applications, including solutions for critical business functions such as enterprise resource planning, customer relationship management and supply chain management.

Analysis

Onapsis Research Labs discovered three critical vulnerabilities in the ICM component of SAP applications. According to the Onapsis Threat Report, the vulnerable ICM component is “present in most SAP products and is a critical part of the overall SAP technology stack,” making these vulnerabilities a major concern for enterprises that deploy SAP products. Because this component connects SAP applications to the internet, it is exposed by default in most deployments.

CVE-2022-22536 is a memory pipes (MPI) desynchronization vulnerability that received the highest CVSSv3 score of 10.0. Onapsis has named this flaw ICMAD for Internet Communication Manager Advanced Desync. An unauthenticated remote attacker could exploit the vulnerability using a simple HTTP request and achieve full system takeover. In addition to being the most critical, CVE-2022-22536 also has the widest effect of all three vulnerabilities, impacting SAP NetWeaver Java or ABAP applications with default configurations.

CVE-2022-22532 is a HTTP request smuggling vulnerability according to SAP in the ICM component. However, Onapsis lists it as a use after free vulnerability. This vulnerability only exists in SAP NetWeaver Java systems. It received a CVSSv3 score of 8.1 and does not require authentication or user interaction to exploit. According to the Onapsis report, certain “more complex [exploit] scenarios” could lead to remote code execution.

CVE-2022-22533 is a memory leak in memory pipe management that could lead to denial of service. It also only affects SAP Application Server Java systems and received a CVSSv3 score of 7.5. An attacker could exploit this flaw using specially crafted HTTP(S) requests to consume all MPI resources.

Proof of concept

Onapsis Research Labs published a scanner script on GitHub for organizations to detect if their SAP instances are vulnerable to CVE-2022-22536. The readme file for the scanner does caution that this script is a best effort attempt at identifying vulnerable instances and cannot provide 100% accuracy.

Solution

As part of its monthly Security Patch Day, SAP published HotNews Security Notes 3123396 and 3123427 (login required) to address CVE-2022-22536 and CVE-2022-22532. The table below lists the SAP products patched. CVE-2022-22533 is not currently listed on the February 2022 Patch Day page.

CVE Description Products
CVE-2022-22536 Memory Pipe Desynchronization SAP Web Dispatcher, Versions: 7.49, 7.53, 7.77, 7.81, 7.85, 7.22EXT, 7.86, 7.87 SAP Content Server, Version: 7.53 SAP NetWeaver and ABAP Platform, Version: KERNEL 7.22, 8.04, 7.49, 7.53, 7.77, 7.81, 7.85, 7.86, 7.87, KRNL64UC 8.04, 7.22, 7.22EXT, 7.49, 7.53, KRNL64NUC 7.22, 7.22EXT, 7.49
CVE-2022-22532 HTTP Request Smuggling/Use After Free SAP NetWeaver Application Server Java, Versions: KRNL64NUC 7.22, 7.22EXT, 7.49, KRNL64UC, 7.22, 7.22EXT, 7.49, 7.53, KERNEL 7.22, 7.49, 7.53

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