CVE-2019-19272 : Vulnerability Insights and Analysis

ProFTPD version 1.3.6 and earlier contain a vulnerability in the tls_verify_crl function, leading to a crash during TLS client/server mutual authentication due to a direct dereference of a NULL pointer.

Understanding CVE-2019-19272

This CVE identifies a specific vulnerability in ProFTPD versions 1.3.6 and earlier.

What is CVE-2019-19272?

CVE-2019-19272 is a security flaw in ProFTPD that can be exploited during TLS client/server mutual authentication, potentially causing a crash.

The Impact of CVE-2019-19272

The vulnerability allows for a crash to occur when validating a client's certificate during TLS client/server mutual authentication due to a direct dereference of a NULL pointer.

Technical Details of CVE-2019-19272

This section provides more technical insights into the CVE.

Vulnerability Description

The issue arises from a direct dereference of a NULL pointer in the tls_verify_crl function, initialized to NULL, causing a crash during certificate validation.

Affected Systems and Versions

Product: ProFTPD
Vendor: N/A
Versions affected: 1.3.6 and earlier

Exploitation Mechanism

The vulnerability is exploited by triggering the tls_verify_crl function during TLS client/server mutual authentication, leading to a crash.

Mitigation and Prevention

Protecting systems from CVE-2019-19272 requires specific actions.

Immediate Steps to Take

Update ProFTPD to a patched version that addresses the vulnerability.
Monitor for any unusual activity on the network that could indicate exploitation.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Ensure that ProFTPD is regularly updated to the latest version to mitigate the vulnerability.