CVE-2021-30533 pertains to an insufficient policy enforcement vulnerability in the PopupBlocker of Google Chrome, which affects versions prior to 91.0.4472.77. This vulnerability allows a remote attacker to bypass navigation restrictions by leveraging a crafted iframe. With a CVSS score of 6.5, this vulnerability is classified as medium severity, indicating a significant risk that organizations must address.
The potential impact of this vulnerability is considerable, as it could enable attackers to manipulate navigation behavior, leading to unauthorized access or exposure of sensitive information. The requirement for user interaction to exploit this vulnerability slightly mitigates the risk; however, it remains a concern for users who may inadvertently engage with malicious content.
As of now, there is no public exploit confirmed for this vulnerability, but the fact that it has been included in the Known Exploited Vulnerabilities (KEV) catalog highlights its relevance and the need for immediate action. Organizations are advised to prioritize patching this vulnerability to reduce their risk exposure.
Given the nature of this vulnerability and the potential for exploitation, organizations should incorporate this into their remediation plans and ensure that updates are applied promptly.
Vulnerability Details
The official description of CVE-2021-30533 states that it involves insufficient policy enforcement in Google Chrome's PopupBlocker prior to version 91.0.4472.77, which allows remote attackers to bypass navigation restrictions via a crafted iframe. This vulnerability has been classified under CWE-863, which pertains to the issue of 'Incorrect Authorization'.
The CVSS score of 6.5 indicates a medium severity level, which highlights the need for organizations to take this seriously. The vulnerability was published on June 7, 2021, and has been analyzed thoroughly, with the potential for significant integrity impact but no confidentiality or availability impact.
Technical Analysis
The root cause of this vulnerability lies in the improper enforcement of policies governing navigation within the PopupBlocker feature of Google Chrome. Attackers may leverage this flaw through a crafted iframe that manipulates the browser's navigation functionality, potentially leading to unauthorized access to restricted content.
The attack vector is remote, meaning that it can be executed over a network, which increases the risk factor. The attack complexity is rated as low, suggesting that an attacker with minimal skills can exploit this vulnerability, especially as it requires user interaction. Privileges required for this attack are none, making it accessible to any user who may inadvertently engage with the malicious content.
The impacts on confidentiality are negligible, while the integrity impact is assessed as high. This means that while sensitive information is not directly exposed, there is a significant risk that the integrity of the user's session or data could be compromised. The availability impact is none, indicating that the vulnerability does not affect the availability of the service.
Risk & Impact Analysis
The real-world risk associated with this vulnerability is substantial, especially given the widespread use of Google Chrome and the Chromium framework in various browsers. Organizations using affected versions of Chrome may find themselves vulnerable to remote attacks that exploit this weakness. The blast radius includes any user who interacts with a malicious iframe, potentially leading to unauthorized data manipulation or exposure.
Given the medium CVSS score, organizations should assess their patching priorities accordingly. This vulnerability should be addressed in the current patch cycle to mitigate potential exploitation risks. The urgency of this assessment is underscored by its inclusion in the KEV catalog, indicating active exploitation in the wild.
Organizations should pay attention to the integrity impacts of this vulnerability and take steps to ensure that their browser environments are secured against such attacks. The potential for manipulation of navigation behavior poses a risk that could have far-reaching consequences if not appropriately managed.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The affected versions of Google Chrome include all versions prior to 91.0.4472.77. Additionally, Fedora versions 33 and 34 are also vulnerable to this issue. Organizations should ensure they are running the latest versions of these software products to mitigate the risks associated with this vulnerability.
Mitigation & Remediation
Organizations should apply the available patches to their Google Chrome and Fedora installations as soon as possible. The latest version of Google Chrome, 91.0.4472.77, provides fixes for this vulnerability. For any systems unable to immediately update, it is recommended to implement strict input validation and monitor user interactions to mitigate potential exploitation.
For further guidance on security testing and vulnerability management, organizations can refer to our penetration testing services that help validate the effectiveness of their security measures.
Detection Guidance
To detect potential exploitation of CVE-2021-30533, organizations should monitor for unusual iframe behavior and track any anomalies in user navigation patterns. Implementing web application firewalls can help identify and block potentially malicious traffic aimed at exploiting this vulnerability.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2021-30533 lies in the way it highlights the importance of robust policy enforcement within web applications. This vulnerability demonstrates a pattern where attackers seek to exploit weaknesses in browser security mechanisms, emphasizing the need for continuous vigilance.
Security teams should take note of this incident as a strategic defensive takeaway, ensuring that their applications and browser environments are resilient against similar types of vulnerabilities. Staying informed about trends in vulnerability exploitation can enable organizations to preemptively address emerging threats.
For more insights on how to protect against vulnerabilities, consider reading our articles on penetration testing methodology and vulnerability management program design to enhance your security posture.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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