CVE-2019-15523 : Security Advisory and Response

LINBIT csync2 through version 2.0 fails to accurately evaluate the return value GNUTLS_E_WARNING_ALERT_RECEIVED of the gnutls_handshake() function, leading to a failure to call the function again as per the API design.

Understanding CVE-2019-15523

LINBIT csync2 through version 2.0 has a vulnerability that affects its evaluation of return values in the gnutls_handshake() function.

What is CVE-2019-15523?

This CVE refers to a flaw in LINBIT csync2 through version 2.0 that results in incorrect evaluation of the return value GNUTLS_E_WARNING_ALERT_RECEIVED, causing a failure to call the function as required by the API design.

The Impact of CVE-2019-15523

The vulnerability can be exploited by an attacker to potentially disrupt secure communication processes and compromise the integrity of data transmissions.

Technical Details of CVE-2019-15523

LINBIT csync2 through version 2.0 is susceptible to a specific vulnerability.

Vulnerability Description

The issue arises from the failure to properly handle the return value GNUTLS_E_WARNING_ALERT_RECEIVED in the gnutls_handshake() function, leading to a deviation from the expected API behavior.

Affected Systems and Versions

Product: LINBIT csync2
Vendor: LINBIT
Versions affected: All versions up to 2.0

Exploitation Mechanism

Attackers could potentially exploit this vulnerability to disrupt secure communication channels and manipulate data transmissions.

Mitigation and Prevention

It is crucial to take immediate action to address and prevent exploitation of CVE-2019-15523.

Immediate Steps to Take

Update LINBIT csync2 to a patched version that addresses the vulnerability.
Monitor network traffic for any signs of unauthorized access or data tampering.

Long-Term Security Practices

Regularly update and patch software to mitigate known vulnerabilities.
Implement network security measures to detect and prevent unauthorized access.

Patching and Updates

Ensure that LINBIT csync2 is regularly updated with the latest security patches to prevent exploitation of vulnerabilities.