Heap-Based Buffer Overflow Vulnerability in FreeXL Package
Summary
DEBIAN-CVE-2017-2923: An exploitable heap based buffer overflow vulnerability exists in the 'read_biff_next_record 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 provides a simple API for developers to integrate Excel file reading capabilities into their applications. However, versions prior to 1.0.4-1 are vulnerable to a heap-based buffer overflow, which can lead to severe security risks, including remote code execution when processing specially crafted XLS files.
Vulnerability Detail
The vulnerability identified as DEBIAN-CVE-2017-2923 originates from a heap-based buffer overflow in the 'read_biff_next_record' function of FreeXL version 1.0.3. An attacker can exploit this vulnerability by sending a maliciously crafted XLS file, which may lead to memory corruption and potentially allow the execution of arbitrary code on the victim's system. This poses a significant risk, especially in environments where Excel files are frequently processed.
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
As a temporary measure, avoid opening XLS files from untrusted sources until the package is updated. Additionally, consider using alternative libraries or tools that do not have this vulnerability for processing Excel files.
Conclusion
The heap-based buffer overflow vulnerability in the FreeXL package poses a significant risk to systems that process Excel files. Users are strongly encouraged to update to the patched version 1.0.4-1 to mitigate this risk. Until the update is applied, it is advisable to avoid opening untrusted XLS files.
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FAQ
The vulnerability is a heap-based buffer overflow that can lead to memory corruption and remote code execution when processing malicious XLS files.
FreeXL versions prior to 1.0.4-1 are affected by this vulnerability.
You can use the Vulert playground at Vulert Scanner to check if your application is affected by this vulnerability without needing to sign up.
If an immediate update is not possible, avoid processing XLS files from untrusted sources as a temporary workaround.
More information can be found in the vulnerability database at https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2017-2923.json.
References
Related vulnerabilities
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