CVE-2019-13115 : What You Need to Know

CVE-2019-13115 is a vulnerability found in the libssh2 library prior to version 1.9.0. This CVE involves an integer overflow issue in the kex_method_diffie_hellman_group_exchange_sha256_key_exchange function, potentially leading to an out-of-bounds read during packet processing.

Understanding CVE-2019-13115

This section provides insights into the nature and impact of the CVE-2019-13115 vulnerability.

What is CVE-2019-13115?

The vulnerability in CVE-2019-13115 arises from an integer overflow in the libssh2 library, specifically in the kex_method_diffie_hellman_group_exchange_sha256_key_exchange function. This flaw could be exploited by attackers who compromise an SSH server to gain unauthorized access to sensitive data or disrupt services on the client system.

The Impact of CVE-2019-13115

The impact of CVE-2019-13115 includes the potential for unauthorized access to sensitive information or denial of service attacks on client systems when establishing connections to compromised SSH servers.

Technical Details of CVE-2019-13115

Explore the technical aspects of CVE-2019-13115 to understand its implications and affected systems.

Vulnerability Description

The vulnerability in CVE-2019-13115 is caused by an integer overflow in the kex_method_diffie_hellman_group_exchange_sha256_key_exchange function within the libssh2 library, leading to out-of-bounds read scenarios during packet processing.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: All versions prior to 1.9.0 are affected.

Exploitation Mechanism

The exploitation of CVE-2019-13115 involves compromising an SSH server to trigger the integer overflow in the vulnerable function, potentially allowing attackers to read out-of-bounds data.

Mitigation and Prevention

Learn how to mitigate the risks associated with CVE-2019-13115 and prevent potential exploitation.

Immediate Steps to Take

Update libssh2 to version 1.9.0 or later to patch the vulnerability.
Monitor for any unauthorized access or unusual activities on SSH servers.

Long-Term Security Practices

Regularly update software and libraries to the latest versions to address known vulnerabilities.
Implement network segmentation and access controls to limit the impact of potential attacks.

Patching and Updates

Stay informed about security advisories and patches released by libssh2 to address vulnerabilities like CVE-2019-13115.