CVE-2019-10053 : Security Advisory and Response

Suricata version 4.1.x before 4.1.4 has a vulnerability in the SSHParseBanner function, leading to a heap-based buffer over-read due to an integer underflow. This CVE was published on April 30, 2019.

Understanding CVE-2019-10053

This CVE affects Suricata version 4.1.x before 4.1.4, impacting the SSHParseBanner function.

What is CVE-2019-10053?

CVE-2019-10053 is a vulnerability in Suricata version 4.1.x before 4.1.4, where the SSHParseBanner function encounters a heap-based buffer over-read when the input contains only a \n character, caused by an integer underflow due to an incorrect search for \r.

The Impact of CVE-2019-10053

The vulnerability can be exploited to trigger a heap-based buffer over-read, potentially leading to a denial of service or information disclosure.

Technical Details of CVE-2019-10053

This section provides technical details about the vulnerability.

Vulnerability Description

The issue in Suricata 4.1.x before 4.1.4 allows a heap-based buffer over-read in the SSHParseBanner function when the input consists solely of a \n character, due to an integer underflow from an incorrect search for \r.

Affected Systems and Versions

Suricata version 4.1.x before 4.1.4

Exploitation Mechanism

The vulnerability is exploited by providing input with only a \n character to the SSHParseBanner function, triggering the heap-based buffer over-read.

Mitigation and Prevention

To address CVE-2019-10053, follow these mitigation strategies:

Immediate Steps to Take

Update Suricata to version 4.1.4 or later to mitigate the vulnerability.
Monitor vendor communications for patches and updates.

Long-Term Security Practices

Regularly update and patch all software to prevent known vulnerabilities.
Conduct security assessments and audits to identify and address potential weaknesses.

Patching and Updates

Apply patches and updates provided by Suricata promptly to ensure system security.