CVE-2017-18359 : Exploit Details and Defense Strategies

PostGIS prior to version 2.3.3, used with PostgreSQL, contains a vulnerability that can be exploited by remote attackers to cause a denial of service by providing specially crafted input to the ST_AsX3D function.

Understanding CVE-2017-18359

PostGIS, a spatial database extender for PostgreSQL, is susceptible to a denial-of-service attack due to improper handling of input.

What is CVE-2017-18359?

PostGIS versions before 2.3.3, when used with PostgreSQL, allow remote attackers to trigger a denial of service by providing malicious input to the ST_AsX3D function, leading to abnormal server termination.

The Impact of CVE-2017-18359

The vulnerability in PostGIS can be exploited remotely, potentially causing a server to terminate unexpectedly, resulting in a denial of service.

Technical Details of CVE-2017-18359

PostGIS vulnerability details and affected systems.

Vulnerability Description

PostGIS 2.x before 2.3.3, when integrated with PostgreSQL, allows remote attackers to disrupt services by exploiting the ST_AsX3D function with crafted input.

Affected Systems and Versions

PostGIS versions prior to 2.3.3

Exploitation Mechanism

Attackers can exploit the vulnerability by providing specially crafted input to the ST_AsX3D function, such as executing the query 'SELECT ST_AsX3D('LINESTRING EMPTY');'.

Mitigation and Prevention

Protecting systems from CVE-2017-18359.

Immediate Steps to Take

Update PostGIS to version 2.3.3 or later to mitigate the vulnerability.
Monitor for any abnormal server terminations that could indicate exploitation.

Long-Term Security Practices

Regularly update and patch PostGIS and PostgreSQL to address security vulnerabilities.

Patching and Updates

Stay informed about security updates and apply patches promptly to prevent exploitation.