CVE-2023-4956: Improper Restriction of Rendered UI Layers or Frames in Red Hat Red Hat Quay 3
A flaw was found in Quay. Clickjacking is when an attacker uses multiple transparent or opaque layers to trick a user into clicking on a button or link on another page when they intend to click on the top-level page. During the pentest, it has been detected that the config-editor page is vulnerable to clickjacking. This flaw allows an attacker to trick an administrator user into clicking on buttons on the config-editor panel, possibly reconfiguring some parts of the Quay instance.
AI Analysis
Technical Summary
CVE-2023-4956 is a clickjacking vulnerability identified in Red Hat Quay 3, a container image registry platform widely used for managing and securing container images. The flaw exists in the config-editor page, where the application fails to properly restrict rendering of UI layers or frames, allowing an attacker to overlay transparent or opaque layers over the legitimate interface. This technique can deceive an administrator into clicking on concealed buttons or links, unintentionally triggering configuration changes within the Quay instance. The vulnerability does not require prior authentication, but successful exploitation depends on tricking an administrator into interacting with the maliciously crafted page, thus requiring user interaction. The impact primarily affects availability, as unauthorized configuration changes could disrupt the normal operation of the container registry service. The CVSS v3.1 base score is 6.5, indicating a medium severity level due to network attack vector, low attack complexity, no privileges required, but requiring user interaction and limited impact on confidentiality and integrity. No public exploits or active exploitation in the wild have been reported to date. The vulnerability was discovered during penetration testing and publicly disclosed on November 7, 2023. The absence of patch links suggests that users should monitor Red Hat advisories for forthcoming fixes. This vulnerability highlights the importance of implementing proper frame-busting defenses such as X-Frame-Options or Content Security Policy (CSP) frame-ancestors directives to prevent UI redress attacks like clickjacking.
Potential Impact
For European organizations, especially those relying on Red Hat Quay 3 for container image management, this vulnerability poses a risk of unauthorized configuration changes that could lead to service disruption or misconfiguration. Such disruptions can affect the availability of container registries, impacting continuous integration and deployment pipelines, and potentially delaying software delivery. While confidentiality and integrity impacts are minimal, the ability to alter configurations without proper authorization could open indirect avenues for further exploitation or operational issues. Organizations in sectors with high reliance on containerized environments, such as finance, telecommunications, and critical infrastructure, may experience operational risks and compliance challenges if the vulnerability is exploited. The requirement for user interaction and targeting administrators somewhat limits the attack scope but does not eliminate risk, particularly in environments with less stringent user training or awareness. The lack of known exploits reduces immediate threat but does not preclude future attacks, emphasizing the need for proactive mitigation.
Mitigation Recommendations
To mitigate CVE-2023-4956, organizations should implement HTTP response headers that prevent the application from being framed by unauthorized sites. Specifically, configure the Red Hat Quay 3 web server to include the X-Frame-Options header set to DENY or SAMEORIGIN, or use the Content Security Policy frame-ancestors directive to restrict framing to trusted origins only. Additionally, organizations should conduct security awareness training for administrators to recognize and avoid clickjacking attempts, emphasizing caution when interacting with unexpected or suspicious web pages. Monitoring administrative access logs for unusual configuration changes can help detect exploitation attempts. Until an official patch is released, consider restricting access to the config-editor page to trusted networks or VPNs to reduce exposure. Regularly review Red Hat security advisories for updates and apply patches promptly once available. Employing web application firewalls (WAFs) with rules to detect and block clickjacking attempts can provide an additional defensive layer.
Affected Countries
Germany, France, United Kingdom, Netherlands, Sweden
CVE-2023-4956: Improper Restriction of Rendered UI Layers or Frames in Red Hat Red Hat Quay 3
Description
A flaw was found in Quay. Clickjacking is when an attacker uses multiple transparent or opaque layers to trick a user into clicking on a button or link on another page when they intend to click on the top-level page. During the pentest, it has been detected that the config-editor page is vulnerable to clickjacking. This flaw allows an attacker to trick an administrator user into clicking on buttons on the config-editor panel, possibly reconfiguring some parts of the Quay instance.
AI-Powered Analysis
Technical Analysis
CVE-2023-4956 is a clickjacking vulnerability identified in Red Hat Quay 3, a container image registry platform widely used for managing and securing container images. The flaw exists in the config-editor page, where the application fails to properly restrict rendering of UI layers or frames, allowing an attacker to overlay transparent or opaque layers over the legitimate interface. This technique can deceive an administrator into clicking on concealed buttons or links, unintentionally triggering configuration changes within the Quay instance. The vulnerability does not require prior authentication, but successful exploitation depends on tricking an administrator into interacting with the maliciously crafted page, thus requiring user interaction. The impact primarily affects availability, as unauthorized configuration changes could disrupt the normal operation of the container registry service. The CVSS v3.1 base score is 6.5, indicating a medium severity level due to network attack vector, low attack complexity, no privileges required, but requiring user interaction and limited impact on confidentiality and integrity. No public exploits or active exploitation in the wild have been reported to date. The vulnerability was discovered during penetration testing and publicly disclosed on November 7, 2023. The absence of patch links suggests that users should monitor Red Hat advisories for forthcoming fixes. This vulnerability highlights the importance of implementing proper frame-busting defenses such as X-Frame-Options or Content Security Policy (CSP) frame-ancestors directives to prevent UI redress attacks like clickjacking.
Potential Impact
For European organizations, especially those relying on Red Hat Quay 3 for container image management, this vulnerability poses a risk of unauthorized configuration changes that could lead to service disruption or misconfiguration. Such disruptions can affect the availability of container registries, impacting continuous integration and deployment pipelines, and potentially delaying software delivery. While confidentiality and integrity impacts are minimal, the ability to alter configurations without proper authorization could open indirect avenues for further exploitation or operational issues. Organizations in sectors with high reliance on containerized environments, such as finance, telecommunications, and critical infrastructure, may experience operational risks and compliance challenges if the vulnerability is exploited. The requirement for user interaction and targeting administrators somewhat limits the attack scope but does not eliminate risk, particularly in environments with less stringent user training or awareness. The lack of known exploits reduces immediate threat but does not preclude future attacks, emphasizing the need for proactive mitigation.
Mitigation Recommendations
To mitigate CVE-2023-4956, organizations should implement HTTP response headers that prevent the application from being framed by unauthorized sites. Specifically, configure the Red Hat Quay 3 web server to include the X-Frame-Options header set to DENY or SAMEORIGIN, or use the Content Security Policy frame-ancestors directive to restrict framing to trusted origins only. Additionally, organizations should conduct security awareness training for administrators to recognize and avoid clickjacking attempts, emphasizing caution when interacting with unexpected or suspicious web pages. Monitoring administrative access logs for unusual configuration changes can help detect exploitation attempts. Until an official patch is released, consider restricting access to the config-editor page to trusted networks or VPNs to reduce exposure. Regularly review Red Hat security advisories for updates and apply patches promptly once available. Employing web application firewalls (WAFs) with rules to detect and block clickjacking attempts can provide an additional defensive layer.
Affected Countries
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Technical Details
- Data Version
- 5.1
- Assigner Short Name
- redhat
- Date Reserved
- 2023-09-14T04:52:43.812Z
- Cvss Version
- 3.1
- State
- PUBLISHED
Threat ID: 68e901b8fd0dca528e8b9a57
Added to database: 10/10/2025, 12:53:12 PM
Last enriched: 10/10/2025, 1:07:55 PM
Last updated: 10/14/2025, 7:58:20 PM
Views: 7
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