CVE-2021-27597 : Vulnerability Insights and Analysis

This article provides detailed information about CVE-2021-27597, a vulnerability in SAP NetWeaver AS for ABAP (RFC Gateway) that allows an unauthenticated attacker to trigger an internal error in the system.

Understanding CVE-2021-27597

CVE-2021-27597 is a vulnerability in SAP NetWeaver AS for ABAP (RFC Gateway) that affects multiple versions of the software, leading to a system crash and unavailability.

What is CVE-2021-27597?

The vulnerability allows an attacker to send a specially crafted packet over a network, triggering an internal error in the system due to improper input validation in the method memmove(). This results in a system crash without allowing the attacker to view or modify any data.

The Impact of CVE-2021-27597

The impact of CVE-2021-27597 is significant as it can render the SAP NetWeaver AS for ABAP (RFC Gateway) system unavailable, causing disruptions to the operations relying on the software.

Technical Details of CVE-2021-27597

This section outlines the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability arises from improper input validation in the method memmove(), which an unauthenticated attacker can exploit to crash the system.

Affected Systems and Versions

The following versions of SAP NetWeaver AS for ABAP (RFC Gateway) are affected: 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.

Exploitation Mechanism

An unauthenticated attacker with no specific system knowledge can exploit this vulnerability by sending a specially crafted packet over a network to trigger the internal error in the system.

Mitigation and Prevention

To address CVE-2021-27597, organizations can take immediate steps, adopt long-term security practices, and ensure timely patching and updates.

Immediate Steps to Take

Organizations should implement vendor-recommended patches and configurations to mitigate the risk associated with the vulnerability.

Long-Term Security Practices

Regular security assessments, penetration testing, and employee training can enhance overall security posture and resilience to similar vulnerabilities.

Patching and Updates

Timely application of security patches and updates provided by SAP SE is crucial to protect against CVE-2021-27597 and other potential threats.