CVE-2019-3862 : Vulnerability Insights and Analysis

A vulnerability was found in libssh2 prior to version 1.8.1, involving the incorrect handling of SSH_MSG_CHANNEL_REQUEST packets. Malicious actors could exploit this to cause a Denial of Service or access sensitive information.

Understanding CVE-2019-3862

This CVE involves a vulnerability in libssh2 that could lead to a Denial of Service or memory data access.

What is CVE-2019-3862?

An out of bounds read flaw in libssh2 before 1.8.1 allows remote attackers to exploit SSH servers.
Attackers could cause a Denial of Service or read data in the client memory.

The Impact of CVE-2019-3862

CVSS Base Score: 7.3 (High)
Attack Vector: Network
Attack Complexity: Low
Confidentiality Impact: Low
Integrity Impact: Low
Availability Impact: Low

Technical Details of CVE-2019-3862

This section provides detailed technical information about the CVE.

Vulnerability Description

The vulnerability involves the incorrect handling of SSH_MSG_CHANNEL_REQUEST packets.
Specifically, packets with an exit status message and no payload are parsed incorrectly.

Affected Systems and Versions

Affected Product: libssh2
Vendor: The libssh2 Project
Affected Version: 1.8.1

Exploitation Mechanism

Malicious actors need to compromise an SSH server to exploit this vulnerability.

Mitigation and Prevention

Protect your systems from CVE-2019-3862 with these mitigation strategies.

Immediate Steps to Take

Update libssh2 to version 1.8.1 or later to patch the vulnerability.
Monitor network traffic for any signs of exploitation.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement network segmentation to limit the impact of potential attacks.
Educate users on safe computing practices to prevent social engineering attacks.

Patching and Updates

Stay informed about security advisories and updates from libssh2 and relevant vendors.