CVE-2024-47076 is a high-severity vulnerability affecting OpenPrinting's libcupsfilters component, primarily used in the CUPS (Common UNIX Printing System). This vulnerability arises from the `cfGetPrinterAttributes5` function, which fails to properly sanitize IPP (Internet Printing Protocol) attributes received from an IPP server. When manipulated, these attributes can provide attacker-controlled data to the rest of the CUPS system, potentially leading to unauthorized data exposure or system compromise.
The CVSS score for this vulnerability is 8.6, indicating a high severity level. This scoring suggests that the potential impact on organizations is significant, particularly in environments where CUPS is utilized for printing tasks. The vulnerability is classified under CWE-20, which pertains to improper input validation, emphasizing the importance of sanitizing data inputs.
Organizations using affected versions of libcupsfilters should prioritize patching immediately, as the vulnerability is actively exploitable. Exploit availability has been confirmed, and remediation is essential to protect against potential attacks.
This vulnerability not only poses a direct risk to systems utilizing CUPS but also highlights the broader implications of insufficient input validation in software components. Attackers may leverage this weakness to inject malicious code or disrupt printing functionalities.
Vulnerability Details
The CUPS system is an open-source printing framework that facilitates print services across various operating systems. The libcupsfilters library, which provides filter code for data format conversion, is critical in ensuring that print jobs are processed correctly. The `cfGetPrinterAttributes5` function's failure to sanitize IPP attributes is a significant oversight, as it allows for the introduction of malicious data into the system.
The vulnerability has a CVSS score of 8.6, indicating a high severity level, which reflects the ease of exploitation and the potential impact on system integrity and confidentiality. The affected product, libcupsfilters, is utilized in various printing applications, which broadens the scope of potential exploitation.
The vulnerability was disclosed on September 26, 2024, and has been categorized under CWE-20, highlighting the critical need for proper input validation in software components. Organizations must remain vigilant and implement updates as soon as they are available to mitigate the associated risks.
Technical Analysis
The root cause of CVE-2024-47076 stems from the lack of sanitization of IPP attributes in the `cfGetPrinterAttributes5` function. This oversight permits attackers to craft specific IPP data that can be processed by the CUPS system without validation. Consequently, attackers may exploit this vulnerability by manipulating the attributes to generate malicious PPD files or alter printer configurations.
The attack vector is classified as NETWORK, indicating that exploitation can occur remotely without requiring physical access to the target system. The attack complexity is low, meaning that even less sophisticated attackers can exploit this vulnerability with relative ease. No user interaction is required, further increasing the risk.
The vulnerability does not require any privileges to exploit, which means that attackers can leverage this weakness without prior access to the system. The impact on confidentiality is rated as NONE, while the integrity impact is HIGH, indicating that successful exploitation could lead to unauthorized changes to the system's configurations or outputs.
Risk & Impact Analysis
The risk to organizations includes unauthorized access to printing functionalities and the potential for attackers to control printing outputs. Given the high severity of this vulnerability, organizations utilizing CUPS or related printing services should address this issue in their priority patch cycle. Failure to do so could result in unauthorized data exposure or disruption of printing services.
The blast radius of this vulnerability extends to any system using libcupsfilters, making it critical for organizations to assess their exposure. The urgency for remediation is high due to the availability of exploits in the wild. Organizations should prioritize patching immediately to mitigate these risks.
Furthermore, the potential for exploitation highlights the importance of maintaining robust security practices, including regular software updates and thorough security assessments, to identify and remediate similar vulnerabilities.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects the following versions of libcupsfilters: all versions prior to vendor patch and specifically version 2.1 beta1. Organizations should ensure they are running the latest patched version to mitigate any risks associated with this vulnerability.
Mitigation & Remediation
Organizations should prioritize patching immediately to remediate this vulnerability. It is critical to update to the latest version of libcupsfilters provided by OpenPrinting. If a patch is not yet available, organizations should implement workarounds to limit exposure and consider utilizing network controls to restrict access to the printing services.
For detailed guidance on security testing, organizations can refer to penetration testing services to assess their environment against this and other vulnerabilities.
Detection Guidance
To detect potential exploitation of this vulnerability, organizations should monitor logs for unusual printer activity, such as unexpected PPD file generation or IPP attribute modifications. Behavioral anomalies in printing jobs and network signatures indicative of unauthorized access attempts should also be flagged for further investigation.
AppSecure Threat Intelligence Insight
CVE-2024-47076 highlights the critical need for input validation in software components. The trend of vulnerabilities related to improper input handling continues to be a significant concern in software security. Security teams should leverage this incident to reinforce their secure coding practices and regularly conduct security assessments to identify similar weaknesses.
Organizations can benefit from a comprehensive vulnerability management program that not only addresses existing vulnerabilities but also fosters a culture of security awareness across development teams.
Implementing a robust security framework can help organizations proactively defend against potential exploits, and adopting a penetration testing methodology can provide insights into the effectiveness of existing security controls.
Lastly, teams should stay informed about emerging threats and trends in the security landscape to adapt their defenses accordingly.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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