CVE-2019-9893 : Security Advisory and Response

libseccomp before version 2.4.0 had a vulnerability that could allow bypassing seccomp filters, potentially leading to privilege escalations.

Understanding CVE-2019-9893

Prior to version 2.4.0, libseccomp had a flaw that could be exploited to bypass seccomp filters.

What is CVE-2019-9893?

Libseccomp before 2.4.0 inaccurately generated 64-bit syscall argument comparisons using arithmetic operators, potentially allowing privilege escalations.

The Impact of CVE-2019-9893

Exploiting this vulnerability could lead to bypassing seccomp filters, enabling attackers to escalate privileges.

Technical Details of CVE-2019-9893

This section provides technical details about the vulnerability.

Vulnerability Description

Libseccomp before version 2.4.0 incorrectly handled 64-bit syscall argument comparisons, which could be abused to bypass seccomp filters.

Affected Systems and Versions

Versions prior to 2.4.0 of libseccomp are affected by this vulnerability.

Exploitation Mechanism

Attackers could exploit the inaccurate generation of syscall argument comparisons to bypass seccomp filters and potentially escalate privileges.

Mitigation and Prevention

Protecting systems from CVE-2019-9893 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update libseccomp to version 2.4.0 or newer to mitigate the vulnerability.
Monitor for any unusual system behavior that could indicate exploitation.

Long-Term Security Practices

Implement strong privilege separation mechanisms to limit the impact of potential privilege escalations.
Regularly review and update seccomp filters to enhance system security.

Patching and Updates

Apply patches provided by the vendor to address the vulnerability and ensure system security.