Heap Buffer Overflow in LibreOffice Draw PDF Import

Executive Summary

LibreOffice Draw has a vulnerability when importing PDF documents. It involves a heap buffer overflow during the import of encrypted PDFs. The issue occurs because the decryption key length from the document's encryption dictionary is used to fill a fixed-size buffer without validation. If the key length exceeds the buffer size, it writes past the buffer's end, causing potential memory corruption.

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Detection Guidance

This vulnerability can be detected by checking for LibreOffice Draw versions prior to the fixed release. Inspect installed versions using package managers like 'apt list --installed | grep libreoffice' or 'dnf list installed libreoffice*' on Linux. For PDF import testing, attempt to open encrypted PDFs with LibreOffice Draw and monitor for crashes or memory corruption errors.

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Impact Analysis

This vulnerability could allow an attacker to execute arbitrary code or cause a denial of service by tricking a user into opening a specially crafted encrypted PDF file in LibreOffice Draw. Successful exploitation may lead to system compromise, data loss, or unauthorized access depending on the user's privileges.

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Compliance Impact

This vulnerability may impact compliance by potentially exposing sensitive data if exploited, leading to unauthorized access or data breaches. Organizations handling regulated data under GDPR or HIPAA could face penalties if the vulnerability results in a data breach due to inadequate software security measures.

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Mitigation Strategies

Update LibreOffice Draw to a fixed version where the decryption key length is properly validated to prevent heap buffer overflow.

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