CVE-2019-3559 : Exploit Details and Defense Strategies

Java Facebook Thrift servers are vulnerable to denial of service attacks due to a lack of error handling when processing messages with unknown field types.

Understanding CVE-2019-3559

This CVE involves a vulnerability in Facebook Thrift servers that could be exploited by malicious clients to disrupt server operations.

What is CVE-2019-3559?

The issue arises from the absence of error handling in Java Facebook Thrift servers when processing messages containing unknown field types.
Malicious clients can exploit this by sending compact messages, prolonging the server's parsing process and potentially leading to denial of service attacks.

The Impact of CVE-2019-3559

Servers running Facebook Thrift versions prior to v2019.02.18.00 are susceptible to this vulnerability.

Technical Details of CVE-2019-3559

Java Facebook Thrift servers are at risk due to a specific vulnerability.

Vulnerability Description

Lack of error handling in Java Facebook Thrift servers when processing messages with unknown field types.

Affected Systems and Versions

Product: Facebook Thrift
Vendor: Facebook
Affected Versions: v2019.02.18.00 and earlier

Exploitation Mechanism

Malicious clients exploit the absence of error handling by sending compact messages that prolong the server's parsing process.

Mitigation and Prevention

Protecting systems from CVE-2019-3559 requires immediate actions and long-term security practices.

Immediate Steps to Take

Upgrade Facebook Thrift servers to version v2019.02.18.00 or newer to mitigate the vulnerability.
Implement strict input validation to prevent malicious messages from causing denial of service.

Long-Term Security Practices

Regularly update and patch software to address known vulnerabilities.
Conduct security audits and testing to identify and remediate potential weaknesses.

Patching and Updates

Stay informed about security advisories and updates from Facebook to address CVE-2019-3559.