CVE-2022-27671 in SAP BusinessObjects Business Intelligence Platform
Summary
by MITRE • 04/12/2022
A CSRF token visible in the URL may possibly lead to information disclosure vulnerability.
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Analysis
by VulDB Data Team • 04/19/2022
The vulnerability identified as CVE-2022-27671 represents a critical security flaw where CSRF tokens are inadvertently exposed within URL parameters, creating potential information disclosure risks. This issue typically occurs in web applications that implement client-side validation or session management mechanisms where security tokens are passed through URL query strings rather than secure HTTP headers or hidden form fields. The exposure of CSRF tokens in URLs creates a significant attack vector as these tokens can be intercepted, logged, or accessed through various means including browser history, server logs, referrer headers, or network traffic analysis. The vulnerability directly relates to CWE-352, which specifically addresses Cross-Site Request Forgery issues, and more specifically CWE-200, dealing with information exposure. When CSRF tokens are visible in URLs, they become accessible to unauthorized parties who can potentially reuse these tokens to perform unauthorized actions on behalf of legitimate users, undermining the fundamental security mechanism designed to prevent such attacks.
The technical implementation of this vulnerability stems from improper handling of security tokens within web application frameworks or custom code implementations. Web developers may inadvertently pass CSRF tokens as URL parameters during form submissions or AJAX requests, particularly when using legacy systems or frameworks that do not properly enforce secure token handling practices. This approach violates standard security protocols where CSRF tokens should be transmitted through secure channels such as HTTP headers, hidden form fields, or HTTP-only cookies. The exposure occurs because URLs are often logged in various system components including web server logs, proxy servers, browser history, and application monitoring tools, making the tokens easily accessible to attackers who gain access to these systems. The vulnerability also aligns with ATT&CK technique T1566, which covers spearphishing attacks, as attackers can leverage these exposed tokens in social engineering campaigns or automated exploitation tools.
The operational impact of CVE-2022-27671 extends beyond simple information disclosure to potentially enable full CSRF attacks against authenticated users. Attackers who intercept these exposed tokens can craft malicious requests that appear legitimate to the web application, allowing them to perform actions such as changing user passwords, modifying account settings, transferring funds, or accessing sensitive data without proper authorization. The vulnerability becomes particularly dangerous in environments where users navigate through multiple applications or services, as the tokens can be captured through cross-site scripting attacks, man-in-the-middle attacks, or by simply accessing logged URLs. Organizations may experience significant security breaches when these tokens are exposed in server logs, browser history, or through network monitoring tools, potentially leading to data loss, financial fraud, or complete account compromise. The risk is compounded by the fact that many security monitoring tools and intrusion detection systems may not properly flag URL-based token exposure as a critical security issue, leading to delayed detection and response times.
Mitigation strategies for this vulnerability must address both immediate remediation and long-term architectural improvements to prevent token exposure in URL parameters. Organizations should implement proper token handling mechanisms that ensure CSRF tokens are only transmitted through secure channels such as HTTP headers or hidden form fields, never embedded in URLs. Web application frameworks should be configured to enforce secure token generation and validation practices, with automatic sanitization of URL parameters to prevent accidental exposure of security tokens. Security headers including Content Security Policy and X-Frame-Options should be implemented to prevent token leakage through referrer headers or cross-site requests. Regular security audits and code reviews should specifically target URL parameter handling to identify and remediate instances where tokens might be inadvertently exposed. Additionally, organizations should implement comprehensive logging and monitoring solutions that can detect unusual patterns of URL access that might indicate token exposure, while also ensuring that server logs are properly configured to avoid storing sensitive information in accessible locations. The implementation of these measures aligns with security frameworks such as NIST SP 800-53 and ISO 27001 requirements for secure application development and information security management.