CVE-2021-33683 : Security Advisory and Response

SAP Web Dispatcher and Internet Communication Manager are affected by a vulnerability that could lead to an HTTP Request Smuggling attack. This CVE-2021-33683 affects multiple versions of SAP products including KRNL32NUC, KRNL64NUC, and more.

Understanding CVE-2021-33683

This CVE impacts SAP Web Dispatcher and Internet Communication Manager by enabling attackers to exploit an HTTP Request Smuggling vulnerability.

What is CVE-2021-33683?

The vulnerability in SAP products allows malicious actors to manipulate invalid Transfer-Encoding headers, potentially leading to an HTTP Request Smuggling attack. This could compromise sensitive data transmission.

The Impact of CVE-2021-33683

With a CVSS base score of 5.4, this medium-severity vulnerability could result in bypassing web application firewalls and extracting sensitive information like customer requests and session credentials.

Technical Details of CVE-2021-33683

The vulnerability is caused by the incorrect processing of invalid HTTP headers, opening the door for HTTP Request Smuggling attacks.

Vulnerability Description

The flaw arises from the improper handling of invalid Transfer-Encoding headers, enabling attackers to manipulate HTTP requests.

Affected Systems and Versions

Multiple versions of SAP products, including KRNL32NUC 7.21, 7.22, KRNL64NUC 7.21, and more, are vulnerable to this exploit.

Exploitation Mechanism

Cybercriminals can exploit this vulnerability to launch HTTP Request Smuggling attacks, potentially leading to data theft and firewall circumvention.

Mitigation and Prevention

To safeguard against CVE-2021-33683, immediate action and long-term security practices are crucial.

Immediate Steps to Take

Organizations should apply security patches provided by SAP promptly and monitor for any signs of unauthorized HTTP requests.

Long-Term Security Practices

Regularly update SAP products, configure web application firewalls properly, and conduct security audits to enhance overall protection.

Patching and Updates

Stay informed about the latest patches and updates from SAP to mitigate the risk of HTTP Request Smuggling attacks effectively.