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CVE-2021-21476 Explained : Impact and Mitigation

Learn about CVE-2021-21476 affecting SAP UI5 versions, allowing attackers to redirect users to malicious sites through Reverse Tabnabbing vulnerabilities. Find mitigation steps and long-term security practices.

SAP UI5 versions before 1.38.49, 1.52.49, 1.60.34, 1.71.31, 1.78.18, 1.84.5, 1.85.4, 1.86.1 allow an unauthenticated attacker to redirect users to a malicious site due to Reverse Tabnabbing vulnerabilities.

Understanding CVE-2021-21476

This CVE affects SAP UI5 versions before specific patch levels, exposing users to the risk of redirection to malicious websites.

What is CVE-2021-21476?

CVE-2021-21476 refers to a vulnerability in SAP UI5 that enables attackers to redirect users to malicious sites without authentication. This is due to Reverse Tabnabbing vulnerabilities present in the affected versions.

The Impact of CVE-2021-21476

The impact of this CVE is considered medium with a CVSS base score of 4.7. It requires user interaction for exploitation and has low integrity impact.

Technical Details of CVE-2021-21476

In this section, we will delve into the vulnerability description, affected systems and versions, as well as the exploitation mechanism.

Vulnerability Description

The vulnerability allows unauthenticated attackers to redirect users to malicious sites using Reverse Tabnabbing weaknesses present in SAP UI5.

Affected Systems and Versions

SAP UI5 versions before 1.38.49, 1.52.49, 1.60.34, 1.71.31, 1.78.18, 1.84.5, 1.85.4, 1.86.1 are affected by this vulnerability.

Exploitation Mechanism

Attackers can exploit this vulnerability by tricking users into clicking on malicious links, leading to unauthorized redirection to harmful sites.

Mitigation and Prevention

To address CVE-2021-21476, certain steps need to be taken to enhance security and protect systems from potential attacks.

Immediate Steps to Take

Users and administrators are advised to update SAP UI5 to versions equal to or beyond the patched levels to mitigate the risk of exploitation.

Long-Term Security Practices

Implementing secure coding practices, conducting regular security assessments, and educating users on safe browsing habits can help prevent similar vulnerabilities in the future.

Patching and Updates

Regularly applying security patches and updates provided by SAP is crucial to maintain the integrity and security of SAP UI5 instances.

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