CVE-2021-27633 : Security Advisory and Response

A vulnerability in SAP NetWeaver AS for ABAP (RFC Gateway) can allow an unauthenticated attacker to crash the system, making it unavailable.

Understanding CVE-2021-27633

This CVE identifier pertains to a flaw in SAP NetWeaver AS for ABAP (RFC Gateway) that can be exploited by an attacker to trigger an internal error in the system.

What is CVE-2021-27633?

The vulnerability in SAP NetWeaver AS for ABAP (RFC Gateway) allows an unauthenticated attacker to send a specially crafted packet over a network, causing the system to crash due to improper input validation.

The Impact of CVE-2021-27633

This vulnerability can render the system unavailable when exploited, although no data can be viewed or modified in the system.

Technical Details of CVE-2021-27633

This section covers specific technical details related to the CVE.

Vulnerability Description

The vulnerability arises from improper input validation in the ThCPIC() method, allowing attackers to crash the system.

Affected Systems and Versions

The issue affects multiple versions of SAP NetWeaver AS for ABAP (RFC Gateway), including KRNL32NUC - 7.22, 7.49, KRNL64UC - 8.04, and more.

Exploitation Mechanism

An unauthenticated attacker with no specific system knowledge can exploit the vulnerability by sending a specially crafted network packet.

Mitigation and Prevention

Addressing the CVE involves taking immediate remediation steps and adopting long-term security practices.

Immediate Steps to Take

It is crucial to apply the necessary patches and updates provided by SAP to mitigate the vulnerability.

Long-Term Security Practices

Implementing robust input validation mechanisms and monitoring network traffic can enhance the system's security posture.

Patching and Updates

Regularly check for security updates and apply patches promptly to protect systems from potential exploitation.