CVE-2019-17498 : Security Advisory and Response

CVE-2019-17498 involves an integer overflow vulnerability in libssh2 versions 1.9.0 and earlier, specifically in the SSH_MSG_DISCONNECT logic. This flaw allows attackers to manipulate memory read operations, potentially leading to information disclosure or denial of service.

Understanding CVE-2019-17498

What is CVE-2019-17498?

The vulnerability in libssh2 versions 1.9.0 and earlier allows attackers to exploit an integer overflow issue during a bounds check, enabling them to specify a customized offset outside the permitted range for a memory read operation.

The Impact of CVE-2019-17498

When a user connects to a malicious SSH server, this vulnerability can result in the exposure of sensitive data or disrupt the client system's availability.

Technical Details of CVE-2019-17498

Vulnerability Description

The flaw in the SSH_MSG_DISCONNECT logic of libssh2 versions 1.9.0 and earlier permits an integer overflow during a bounds check, enabling attackers to manipulate memory read operations.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: 1.9.0 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by connecting to a crafted SSH server, allowing them to specify a customized offset outside the permitted range for a memory read operation.

Mitigation and Prevention

Immediate Steps to Take

Update libssh2 to the latest version to patch the vulnerability.
Monitor vendor advisories and security mailing lists for updates and patches.

Long-Term Security Practices

Regularly update software and libraries to mitigate known vulnerabilities.
Implement network segmentation and access controls to limit exposure to potential threats.

Patching and Updates

Apply security updates and patches promptly to address known vulnerabilities in libssh2.