CVE-2021-27634 : Exploit Details and Defense Strategies
Learn about CVE-2021-27634 affecting SAP NetWeaver AS for ABAP (RFC Gateway). Understand the impact, affected versions, and mitigation steps to secure your systems.
SAP NetWeaver AS for ABAP (RFC Gateway) versions 7.22, 7.22EXT, 7.49, 8.04, 7.53, 7.73, and more are vulnerable to CVE-2021-27634. An unauthenticated attacker can exploit this vulnerability to crash the system by sending a specially crafted packet over the network.
Understanding CVE-2021-27634
What is CVE-2021-27634?
CVE-2021-27634 affects SAP NetWeaver AS for ABAP (RFC Gateway) and allows an unauthenticated attacker to trigger an internal error in the system by sending a malicious packet.
The Impact of CVE-2021-27634
This vulnerability can lead to a system crash, rendering it unavailable, although no data in the system can be viewed or modified during the attack.
Technical Details of CVE-2021-27634
Vulnerability Description
The issue arises from improper input validation in method ThCpicDtCreate(), enabling attackers to exploit this flaw.
Affected Systems and Versions
- Vendor: SAP SE
- Product: SAP NetWeaver AS for ABAP (RFC Gateway)
- Affected Versions: 7.22, 7.22EXT, 7.49, 8.04, 7.53, 7.73, and more
Exploitation Mechanism
By sending a specially crafted packet over the network, unauthenticated attackers can trigger the internal error, leading to a system crash.
Mitigation and Prevention
Immediate Steps to Take
It is recommended to apply the patches provided by SAP promptly to mitigate the vulnerability.
Long-Term Security Practices
Regularly update and patch your SAP systems to ensure they are protected from known vulnerabilities.
Patching and Updates
Refer to the SAP Security Notes 3020209 for specific instructions on patching the affected systems.