Heap-Based Buffer Overflow in FreeXL Package Leading to Remote Code Execution
Summary
CVE-2017-2924: An exploitable heap-based buffer overflow vulnerability exists in the read_legacy_biff function of FreeXL 1.0.3. Affects freexl versions < 1.0.4-1. Fixed in 1.0.4-1. How to fix ↓
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Background
FreeXL is an open-source library designed for reading Excel files in the XLS format. It is widely used in applications that require data extraction from spreadsheets. The library provides a straightforward API for developers to integrate Excel file handling into their software. However, FreeXL versions prior to 1.0.4-1 are vulnerable to a critical heap-based buffer overflow, which can be exploited through specially crafted XLS files.
Vulnerability Detail
The vulnerability, identified as CVE-2017-2924, originates from the read_legacy_biff function within FreeXL. An attacker can exploit this vulnerability by sending a maliciously crafted XLS file to a target system. This can lead to memory corruption, allowing the attacker to execute arbitrary code remotely. The severity of this vulnerability is underscored by its CVSS score of 8.8, indicating a high risk to affected systems. If successfully exploited, this vulnerability could allow unauthorized access and control over the affected application.
How To Fix
Minimum fixed version
1.0.4-1
This is the first release that contains the fix.
sudo apt-get install --only-upgrade freexlTip — Not sure which version your app runs? Vulert can match this fix to it. Scan free →
Workaround
If an immediate upgrade is not feasible, users can implement input validation to ensure that only trusted XLS files are processed. Additionally, restricting file upload capabilities to known safe sources can help mitigate the risk until the library is updated.
Conclusion
CVE-2017-2924 represents a significant security risk for applications utilizing the FreeXL library. It is crucial for developers and system administrators to upgrade to the fixed version to protect against potential exploitation. By following the recommended steps and utilizing tools like Vulert, users can ensure their applications remain secure.
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FAQ
CVE-2017-2924 is a vulnerability in the FreeXL library that allows for remote code execution through a heap-based buffer overflow.
You can check if your application is affected by using the Vulert playground at Vulert Scanner, which analyzes your manifest file for vulnerabilities.
Exploitation of this vulnerability can lead to unauthorized access, data manipulation, and complete control over the affected system.
Yes, implementing strict input validation and limiting file uploads to trusted sources can help protect your application temporarily.
The CVSS score for CVE-2017-2924 is 8.8, indicating a high severity level.
References
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