A flaw was found in DjVuLibre versions 3.5.28 and earlier. A stack overflow in function DJVU::DjVuDocument::get_djvu_file() via a crafted djvu file may lead to application crash and other consequences. This vulnerability is classified as high severity with a CVSS score of 7.8, indicating significant risk to systems utilizing the affected software.
The exploitability of this vulnerability is rated high, emphasizing the urgent need for remediation. Risk to organizations includes potential system instability and unauthorized access through application crashes. Organizations should prioritize patching immediately.
Given the nature of the flaw and its potential consequences, it is critical for affected organizations to take immediate action to mitigate risks associated with this vulnerability.
As of now, no public exploits have been confirmed, but the nature of the vulnerability suggests that it could be leveraged by attackers. Therefore, organizations should remain vigilant.
Vulnerability Details
This vulnerability allows a stack overflow in DjVuLibre versions 3.5.28 and earlier due to inadequate input validation in the function DJVU::DjVuDocument::get_djvu_file(). The official CVSS score is 7.8, reflecting a high severity level, which corresponds to a local attack vector with low complexity and requires user interaction.
The confidentiality, integrity, and availability impacts are all rated high, indicating that successful exploitation could lead to unauthorized access to sensitive information, modification of data, and disruption of service.
The vulnerability affects Debian Linux systems and DjVuLibre installations. It was published on June 24, 2021, and classified under CWE-787 for improper control of a resource through its lifetime.
Technical Analysis
The root cause of this vulnerability lies in the handling of crafted djvu files which can cause a stack overflow. The attack vector is local, meaning that an attacker must have access to the system to exploit this vulnerability. The attack complexity is low, requiring no special privileges and only user interaction.
The consequences of successful exploitation include a potential crash of the application, which could lead to denial of service. The confidentiality, integrity, and availability impacts are rated high, indicating that an attacker can potentially execute arbitrary code.
Risk & Impact Analysis
Real-world deployment risk from this vulnerability is significant, especially for organizations relying on DjVuLibre for document processing. The potential blast radius includes all users and systems utilizing affected versions across various Debian distributions.
Given its high CVSS score, organizations should address this vulnerability in their priority patch cycle. The urgency is underscored by the potential for attackers to exploit this flaw to gain unauthorized access or disrupt services.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability impacts DjVuLibre versions up to and including 3.5.28. Additionally, it affects Debian Linux versions 10.0 and 11.0. Organizations using these versions should consider immediate remediation.
Mitigation & Remediation
Organizations should update to the latest version of DjVuLibre to mitigate this vulnerability. If a patch is not available, consider alternative document handling solutions or implement stricter controls on file handling.
Configuration hardening can also help limit exposure to this vulnerability. Regularly monitor systems for unusual activities and ensure that security patches are applied promptly.
Penetration testing can help identify vulnerabilities and evaluate the effectiveness of security measures.
Detection Guidance
Organizations should monitor logs for any indications of application crashes or unauthorized access attempts. Behavioral anomalies in the application, especially those related to file handling, should be investigated.
Network signatures for DjVu file processing can also be beneficial in identifying potential exploitation attempts.
AppSecure Threat Intelligence Insight
The long-term significance of this vulnerability highlights the importance of robust input validation in software development. It serves as a reminder for security teams to prioritize thorough testing and validation.
Patterns of similar vulnerabilities suggest a trend towards weaknesses in handling user-generated content. Security teams should adopt a proactive approach to identify and remediate potential issues.
Strategically, organizations should integrate security assessments into their software development lifecycle, ensuring vulnerabilities are identified and mitigated early on.
For further information on securing your applications, consider reviewing our resources on penetration testing methodology and best practices.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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