CVE-2019-3779 : Exploit Details and Defense Strategies
Learn about CVE-2019-3779 affecting Cloud Foundry Container Runtime. Discover the impact, affected systems, exploitation details, and mitigation steps to secure your environment.
Cloud Foundry Container Runtime (CFCR) before version 0.29.0 is affected by a vulnerability that allows a user to bypass security policies when communicating with ETCD.
Understanding CVE-2019-3779
This CVE involves a security issue in Cloud Foundry Container Runtime that could lead to privilege escalation.
What is CVE-2019-3779?
Versions of Cloud Foundry Container Runtime prior to 0.29.0 use a common CA for signing certificates for ETCD and the Kubernetes API. This flaw enables an authenticated user to exploit the Kubernetes CSR capability to obtain a signed certificate, potentially escalating access privileges to ETCD.
The Impact of CVE-2019-3779
The vulnerability has a CVSS v3.0 base score of 8.8, indicating a high severity level. It poses a significant risk to confidentiality, integrity, and availability, with no special privileges required for exploitation.
Technical Details of CVE-2019-3779
This section delves into the specifics of the vulnerability.
Vulnerability Description
The issue stems from Cloud Foundry Container Runtime's use of a shared CA for ETCD and Kubernetes API certificates, allowing unauthorized certificate requests.
Affected Systems and Versions
- Product: Cloud Foundry Container Runtime (CFCR)
- Vendor: Cloud Foundry
- Versions Affected: All versions prior to v0.29.0
Exploitation Mechanism
By leveraging the Kubernetes CSR capability, an authenticated user can request a signed certificate, potentially gaining elevated access to ETCD.
Mitigation and Prevention
Protecting systems from CVE-2019-3779 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Upgrade Cloud Foundry Container Runtime to version 0.29.0 or newer to mitigate the vulnerability.
- Monitor and restrict user access to prevent unauthorized certificate requests.
Long-Term Security Practices
- Implement strict access controls and least privilege principles within the environment.
- Regularly review and update security configurations to address emerging threats.
Patching and Updates
- Stay informed about security updates and patches released by Cloud Foundry to address CVE-2019-3779.