CVE-2020-16119 : Exploit Details and Defense Strategies

A use-after-free vulnerability in the Linux kernel affecting various versions of the Ubuntu Linux kernel.

Understanding CVE-2020-16119

This CVE involves a use-after-free vulnerability in the Linux kernel that can be exploited by a local attacker.

What is CVE-2020-16119?

This vulnerability arises from the reuse of a DCCP socket with an attached dccps_hc_tx_ccid object as a listener after being released.

The Impact of CVE-2020-16119

CVSS Base Score: 6.3 (Medium)
Attack Vector: Local
Attack Complexity: High
Privileges Required: Low
Integrity Impact: High
Availability Impact: High

Technical Details of CVE-2020-16119

This section provides more technical insights into the vulnerability.

Vulnerability Description

The vulnerability allows a local attacker to exploit a use-after-free issue in the Linux kernel.

Affected Systems and Versions

The following versions of the Ubuntu Linux kernel are affected:

Linux kernel 5.4.0-51.56
Linux kernel 5.3.0-68.63
Linux kernel 4.15.0-121.123
Linux kernel 4.4.0-193.224
Linux kernel 3.13.0.182.191
Linux kernel 3.2.0-149.196

Exploitation Mechanism

The vulnerability can be exploited by a local attacker through the reuse of a DCCP socket with a specific object.

Mitigation and Prevention

Steps to address and prevent the CVE-2020-16119 vulnerability.

Immediate Steps to Take

Apply the necessary patches provided by Ubuntu to fix the vulnerability.
Monitor security advisories for updates and apply them promptly.

Long-Term Security Practices

Regularly update the Linux kernel to the latest secure versions.
Implement proper access controls and restrictions to limit potential exploitation.

Patching and Updates

Ensure all affected systems are updated with the patched versions of the Linux kernel.