CVE-2019-15878 : Security Advisory and Response
Learn about CVE-2019-15878, a FreeBSD vulnerability allowing unprivileged local users to trigger a use-after-free scenario in certain versions. Find mitigation steps here.
An unprivileged local user can trigger a use-after-free scenario in FreeBSD versions 12.1-STABLE before r352509, 11.3-STABLE before r352509, and 11.3-RELEASE before p9 due to inadequate validation in SCTP when modifying an SCTP-AUTH shared key.
Understanding CVE-2019-15878
This CVE identifies a use-after-free vulnerability in FreeBSD versions that can be exploited by a local unprivileged user.
What is CVE-2019-15878?
CVE-2019-15878 is a security vulnerability in FreeBSD that allows an unprivileged local user to create a use-after-free situation by manipulating an SCTP-AUTH shared key without proper validation.
The Impact of CVE-2019-15878
The vulnerability can be exploited by a local user to potentially execute arbitrary code or disrupt system operations, leading to a denial of service (DoS) condition.
Technical Details of CVE-2019-15878
This section provides detailed technical information about the vulnerability.
Vulnerability Description
The issue arises from inadequate validation in SCTP when attempting to modify an SCTP-AUTH shared key, leading to a use-after-free scenario.
Affected Systems and Versions
- FreeBSD 12.1-STABLE before r352509
- FreeBSD 11.3-STABLE before r352509
- FreeBSD 11.3-RELEASE before p9
Exploitation Mechanism
The vulnerability can be exploited by an unprivileged local user through improper checking in SCTP when updating an SCTP-AUTH shared key.
Mitigation and Prevention
Protecting systems from CVE-2019-15878 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply the necessary patches provided by FreeBSD to address the vulnerability.
- Monitor system logs for any suspicious activities that could indicate exploitation.
Long-Term Security Practices
- Regularly update and patch FreeBSD systems to mitigate known vulnerabilities.
- Implement the principle of least privilege to restrict user access and minimize potential risks.
Patching and Updates
- Stay informed about security advisories from FreeBSD and promptly apply relevant patches to secure the system.