CVE-2019-1549 : Exploit Details and Defense Strategies

OpenSSL 1.1.1 implemented a redesigned random number generator (RNG) to address the issue of parent and child processes sharing the same RNG state after a fork() system call. Learn about the impact, technical details, and mitigation steps.

Understanding CVE-2019-1549

OpenSSL 1.1.1 introduced a rewritten random number generator (RNG) to prevent parent and child processes from sharing the same RNG state after a fork() system call.

What is CVE-2019-1549?

OpenSSL 1.1.1 had a vulnerability where the protection mechanism against parent and child processes sharing the RNG state was not enabled by default, affecting versions 1.1.1 to 1.1.1c.

The Impact of CVE-2019-1549

The issue could lead to parent and child processes sharing the same RNG state, potentially compromising cryptographic operations.

Technical Details of CVE-2019-1549

OpenSSL 1.1.1d addressed the vulnerability related to parent and child processes sharing the RNG state.

Vulnerability Description

OpenSSL 1.1.1 did not enable the protection mechanism against parent and child processes sharing the RNG state by default.

Affected Systems and Versions

Affected versions: 1.1.1 to 1.1.1c

Exploitation Mechanism

The vulnerability could be exploited by parent and child processes sharing the same RNG state, impacting cryptographic operations.

Mitigation and Prevention

To address CVE-2019-1549, follow these steps:

Immediate Steps to Take

Update OpenSSL to version 1.1.1d or later to mitigate the vulnerability.
Ensure that applications explicitly call OPENSSL_init_crypto() with OPENSSL_INIT_ATFORK to avoid the issue.

Long-Term Security Practices

Regularly update OpenSSL and other cryptographic libraries to the latest versions.
Implement secure coding practices to minimize the impact of potential vulnerabilities.

Patching and Updates

Stay informed about security advisories and promptly apply patches to address known vulnerabilities.