CVE-2024-56527 is a high-severity vulnerability that affects TCPDF versions prior to 6.8.0. This vulnerability allows attackers to exploit improper error handling within the TCPDF library, which is widely used for generating PDF documents in PHP applications. The error function lacks an appropriate call to htmlspecialchars for error messages, leading to potential exposure of sensitive information.
The CVSS score for this vulnerability is 7.5, indicating a high severity level. The attack vector for this vulnerability is network-based, and the attack complexity is low, making it relatively easy for attackers to exploit. The absence of required privileges and user interaction further increases the likelihood of successful exploitation. As a result, the risk to organizations includes unauthorized access to sensitive data or system features.
Currently, there is no known public exploit for this vulnerability, but the potential impacts could be significant. Organizations using affected versions of TCPDF should prioritize remediation efforts to mitigate potential risks associated with this vulnerability.
Organizations should prioritize patching immediately.
Vulnerability Details
The official description states: An issue was discovered in TCPDF before 6.8.0. The Error function lacks an htmlspecialchars call for the error message. This vulnerability is classified under CWE-79, which pertains to improper neutralization of input during web page generation ('XSS').
The CVSS score of 7.5 indicates that the vulnerability poses a high risk, primarily due to its potential impact on availability, which is rated as high, while confidentiality and integrity impacts are marked as none.
The affected product is TCPDF, specifically versions prior to 6.8.0. The vulnerability was published on December 27, 2024. Organizations should ensure they are using the latest version of TCPDF to mitigate the associated risks.
Technical Analysis
The root cause of this vulnerability lies in the lack of proper input sanitization for error messages within the TCPDF library. When errors occur, the library outputs messages that may contain special characters. Without proper handling, these messages can lead to cross-site scripting (XSS) vulnerabilities.
The attack vector is network-based, allowing attackers to exploit the vulnerability remotely without physical access to the system. The attack complexity is low; no special conditions are required for exploitation. Additionally, no privileges are needed, and user interaction is not required, making the vulnerability significantly easier to exploit.
The impact of this vulnerability is primarily on availability, rated as high, indicating that successful exploitation could lead to service disruptions. Confidentiality and integrity impacts are rated as none, suggesting that this vulnerability does not directly expose sensitive data but could lead to availability issues.
Risk & Impact Analysis
The risk to organizations includes potential downtime or service interruptions resulting from successful exploitation of this vulnerability. Given that TCPDF is commonly used for generating PDFs in many applications, the blast radius could be substantial, affecting multiple users and systems relying on this library.
Organizations should address this vulnerability in their priority patch cycle. The low attack complexity and the absence of required privileges mean that even less sophisticated attackers could exploit this vulnerability, increasing the urgency for remediation.
The current EPSS score for this vulnerability is 0.00346, placing it in the 57th percentile, indicating a low probability of being exploited in the wild. However, organizations should not rely solely on this metric and must proactively manage the risk by applying the necessary patches.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
All versions of TCPDF prior to 6.8.0 are affected by this vulnerability. Organizations should ensure that they upgrade to version 6.8.0 or later to mitigate the risk associated with this issue.
Mitigation & Remediation
To mitigate this vulnerability, organizations should apply the latest patch from TCPDF. Upgrading to version 6.8.0 or later is essential to address the issue. If immediate patching is not feasible, consider implementing workarounds such as input validation and sanitization for error messages to minimize exposure.
For a comprehensive security validation, organizations should engage in penetration testing to identify any remaining vulnerabilities.
Detection Guidance
Monitoring for unusual behavior in applications using TCPDF may help detect exploitation attempts. Log indicators should include error messages that lack proper sanitization. Additionally, organizations should watch for unexpected service disruptions or performance issues.
AppSecure Threat Intelligence Insight
CVE-2024-56527 represents a critical reminder of the importance of input validation in web applications. The vulnerability highlights a common oversight in error handling that can lead to significant security risks.
Security teams should ensure that proper sanitization measures are in place to prevent similar vulnerabilities in the future. Regular code reviews and implementation of secure coding practices can help mitigate these risks.
For organizations looking to enhance their security posture, engaging in vulnerability management programs can provide long-term benefits by identifying and addressing potential security gaps.
Additionally, organizations should explore engaging in continuous penetration testing to stay ahead of emerging threats.
Finally, security teams should consider adopting API security assessments to further bolster their defenses against potential exploitation.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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