CVE-2017-2919 : Exploit Details and Defense Strategies

A vulnerability in the xls_getfcell function of libxls 1.3.4 can lead to remote code execution through a stack-based buffer overflow.

Understanding CVE-2017-2919

This CVE involves a critical vulnerability in the libxls library version 1.3.4 that allows attackers to execute remote code by exploiting a specific function.

What is CVE-2017-2919?

CVE-2017-2919 is a security vulnerability in the libxls library version 1.3.4 that enables attackers to trigger a stack-based buffer overflow through a specially crafted XLS file. This can result in memory corruption and the execution of remote code.

The Impact of CVE-2017-2919

The vulnerability has a CVSS base score of 8.8, indicating a high severity level. The impact includes:

High confidentiality, integrity, and availability impact
Low attack complexity
No privileges required for exploitation
User interaction required

Technical Details of CVE-2017-2919

This section provides detailed technical insights into the vulnerability.

Vulnerability Description

The vulnerability lies in the xls_getfcell function of libxls 1.3.4, allowing attackers to exploit a stack-based buffer overflow.

Affected Systems and Versions

Product: libxls
Vendor: libxls
Version: 1.3.4

Exploitation Mechanism

By sending a specifically crafted XLS file, an attacker can trigger a memory corruption leading to the execution of remote code.

Mitigation and Prevention

Protecting systems from CVE-2017-2919 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update libxls to a patched version or apply vendor-supplied fixes.
Avoid opening XLS files from untrusted or unknown sources.
Implement network security measures to detect and block malicious XLS files.

Long-Term Security Practices

Regularly update software and libraries to patch known vulnerabilities.
Conduct security assessments and penetration testing to identify and address potential weaknesses.
Educate users on safe browsing habits and the risks associated with opening files from unverified sources.

Patching and Updates

Stay informed about security advisories and updates from libxls to apply patches promptly.