A reflected cross-site scripting (XSS) vulnerability was found in the 'oob' OAuth endpoint due to incorrect null-byte handling. This issue allows a malicious link to insert an arbitrary URI into a Keycloak error page. This flaw requires a user or administrator to interact with a link in order to be vulnerable. This may compromise user details, allowing it to be changed or collected by an attacker.
The vulnerability has a CVSS score of 8.1, indicating a high severity level. It is critical for organizations using this technology to understand the implications of this vulnerability, as it poses a significant risk of data exposure and integrity loss.
Organizations should prioritize patching immediately to mitigate the risk associated with this vulnerability. Users and administrators should be made aware of the potential dangers of interacting with untrusted links.
The vulnerability has been reported by Red Hat and is documented under CVE-2022-4137. As of now, it has not been included in the Known Exploited Vulnerabilities (KEV) catalog.
Organizations that have deployed Red Hat Keycloak or Single Sign-On components should assess their exposure and take necessary action to remediate the identified vulnerability.
Vulnerability Details
A reflected cross-site scripting (XSS) vulnerability was found in the 'oob' OAuth endpoint due to incorrect null-byte handling. This issue allows a malicious link to insert an arbitrary URI into a Keycloak error page. The vulnerability affects all versions of Red Hat Keycloak and Single Sign-On prior to vendor patch.
CVSS score: 8.1 (High) - This score indicates a significant risk level, requiring immediate attention from security teams.
CWE classification: CWE-79 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')) and CWE-81 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')).
Technical Analysis
The root cause of this vulnerability stems from incorrect handling of null bytes within the OAuth endpoint. This flaw can be exploited by an attacker via a crafted malicious link that, when interacted with by a user or administrator, may lead to the execution of arbitrary code or the exposure of sensitive information.
The attack vector is network-based, with low complexity and no privileges required for exploitation. User interaction is required to trigger the vulnerability.
The confidentiality and integrity impacts are both rated high, indicating that an attacker could gain unauthorized access to sensitive user data and potentially alter it.
Risk & Impact Analysis
Risk to organizations includes potential unauthorized access to user accounts and the ability to manipulate sensitive data. With this vulnerability being publicly disclosed, the urgency to address it is high, particularly for organizations managing sensitive user data.
The presence of a vulnerability in widely used software like Keycloak can lead to significant exposure, as attackers may leverage this flaw to launch targeted attacks on affected organizations.
Given the high CVSS score and the potential impact, organizations should schedule remediation as a priority in their patch management process.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The following versions of Red Hat products are affected by CVE-2022-4137:
All versions of Keycloak and Single Sign-On prior to vendor patch.
Mitigation & Remediation
To remediate this vulnerability, organizations should upgrade to the latest version of Keycloak or Single Sign-On as provided by Red Hat. Regular updates and patches should be a part of the organization's security policy.
In the meantime, it is advisable to implement network controls that restrict access to the OAuth endpoint and educate users about the risks associated with interacting with unverified links.
Penetration testing can also help identify and remediate similar vulnerabilities.
Detection Guidance
Monitoring for logs indicating unusual access patterns, especially around the OAuth endpoint, can help detect potential exploitation attempts.
Organizations should also be vigilant for behavioral anomalies that could suggest an XSS attack is in progress.
AppSecure Threat Intelligence Insight
The long-term significance of CVE-2022-4137 lies in its demonstration of how even minor misconfigurations can lead to severe vulnerabilities, particularly in user-facing applications. Security teams should reinforce the importance of secure coding practices and regular security assessments.
This vulnerability also highlights the need for organizations to remain proactive in their security posture. Regular reviews and updates to security policies are essential.
For further insights, organizations can explore resources on penetration testing methodology and the importance of continuous security assessments.
Security teams should leverage this incident as a learning opportunity to strengthen their defenses against similar vulnerabilities.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
.webp)