CVE-2018-20304 : Exploit Details and Defense Strategies

A vulnerability in the libexcel library version 0.01 can lead to a denial of service attack by exploiting the wbook_addworksheet function.

Understanding CVE-2018-20304

This CVE involves a vulnerability in the libexcel library version 0.01 that allows attackers to trigger a denial of service condition.

What is CVE-2018-20304?

The vulnerability exists in the wbook_addworksheet function in the workbook.c file within the libexcel.a library version 0.01. Attackers can exploit this flaw by providing an excessively long second argument, leading to a denial of service (SEGV) attack. It's crucial to note that this vulnerability is not associated with any Microsoft products.

The Impact of CVE-2018-20304

The presence of this vulnerability enables attackers to create a denial of service condition (SEGV) by supplying a long second argument, potentially disrupting the normal operation of the affected system.

Technical Details of CVE-2018-20304

This section provides more technical insights into the CVE.

Vulnerability Description

The vulnerability in the wbook_addworksheet function in the workbook.c file within the libexcel.a library version 0.01 allows attackers to cause a denial of service (SEGV) by providing a lengthy second argument.

Affected Systems and Versions

Affected Version: libexcel.a library version 0.01
Systems using the vulnerable library version are at risk of exploitation.

Exploitation Mechanism

Attackers exploit the vulnerability by supplying an excessively long second argument to the wbook_addworksheet function, triggering a denial of service condition.

Mitigation and Prevention

Protecting systems from CVE-2018-20304 requires immediate actions and long-term security measures.

Immediate Steps to Take

Update the libexcel library to a patched version that addresses the vulnerability.
Implement input validation to prevent excessively long arguments.

Long-Term Security Practices

Regularly monitor and update libraries and dependencies to ensure security patches are applied promptly.
Conduct security assessments and code reviews to identify and mitigate similar vulnerabilities.

Patching and Updates

Apply patches provided by the library maintainers to fix the vulnerability and enhance system security.