CVE-2018-20354 : Exploit Details and Defense Strategies

A deniable service or the ability to execute remote code can occur as a result of a use-after-free vulnerability during a "return" in the mg_http_get_proto_data function in the Cesanta Mongoose Embedded Web Server Library versions 6.13 and earlier, leading to an invalid read of 8 bytes.

Understanding CVE-2018-20354

This CVE-2018-20354 vulnerability was published on December 18, 2018, and poses a risk of denial of service or remote code execution.

What is CVE-2018-20354?

CVE-2018-20354 is a use-after-free vulnerability in the Cesanta Mongoose Embedded Web Server Library versions 6.13 and earlier. It allows an attacker to trigger a denial of service or execute remote code by exploiting a flaw in the mg_http_get_proto_data function.

The Impact of CVE-2018-20354

The vulnerability can lead to an invalid read of 8 bytes, potentially resulting in a denial of service (application crash) or remote code execution, posing a significant threat to the security and stability of affected systems.

Technical Details of CVE-2018-20354

This section provides more in-depth technical insights into the CVE-2018-20354 vulnerability.

Vulnerability Description

The use-after-free vulnerability in the mg_http_get_proto_data function in the Cesanta Mongoose Embedded Web Server Library versions 6.13 and earlier allows for an invalid read of 8 bytes, enabling attackers to exploit the flaw for denial of service or remote code execution.

Affected Systems and Versions

Cesanta Mongoose Embedded Web Server Library versions 6.13 and earlier

Exploitation Mechanism

The vulnerability is exploited by triggering a use-after-free condition during a "return" in the mg_http_get_proto_data function, leading to the invalid read of 8 bytes.

Mitigation and Prevention

To address CVE-2018-20354 and enhance system security, follow these mitigation strategies:

Immediate Steps to Take

Apply vendor patches or updates promptly
Monitor security advisories for any new information
Implement network segmentation to limit the impact of potential attacks

Long-Term Security Practices

Conduct regular security assessments and audits
Educate users and administrators on secure coding practices
Employ intrusion detection and prevention systems

Patching and Updates

Ensure all systems are updated with the latest patches from the vendor
Regularly check for security updates and apply them as soon as they are available