CVE-2020-25577 : Vulnerability Insights and Analysis
Learn about CVE-2020-25577 affecting FreeBSD versions before p1, p11, and p5. Discover the impact, technical details, and mitigation steps for this improper validation vulnerability.
In FreeBSD 12.2-STABLE before r368250, 11.4-STABLE before r368253, 12.2-RELEASE before p1, 12.1-RELEASE before p11, and 11.4-RELEASE before p5, a vulnerability exists in rtsold(8) that could lead to improper validation, potentially causing overflow vulnerabilities.
Understanding CVE-2020-25577
This CVE identifies a specific vulnerability in FreeBSD versions mentioned above.
What is CVE-2020-25577?
The vulnerability in rtsold(8) in FreeBSD versions allows malformed packets to be passed to userspace programs without proper validation, potentially leading to overflow vulnerabilities.
The Impact of CVE-2020-25577
The vulnerability could be exploited by attackers to trigger overflow conditions in programs that rely on kernel validation, potentially leading to security breaches or system crashes.
Technical Details of CVE-2020-25577
This section provides more technical insights into the CVE.
Vulnerability Description
The issue lies in rtsold(8) not verifying that the RDNSS option does not extend past the end of the received packet before processing its contents, allowing malformed packets to be passed to userspace programs.
Affected Systems and Versions
- FreeBSD 12.2-RELEASE before p1
- FreeBSD 12.1-RELEASE before p11
- FreeBSD 11.4-RELEASE before p5
Exploitation Mechanism
Attackers can exploit this vulnerability by crafting malicious packets that trigger the overflow condition in programs relying on kernel validation.
Mitigation and Prevention
Protecting systems from CVE-2020-25577 requires immediate actions and long-term security practices.
Immediate Steps to Take
- Apply patches provided by FreeBSD to address the vulnerability.
- Monitor network traffic for any signs of exploitation.
Long-Term Security Practices
- Regularly update FreeBSD systems to the latest stable releases.
- Implement network segmentation to limit the impact of potential attacks.
Patching and Updates
Ensure timely installation of security patches released by FreeBSD to mitigate the vulnerability effectively.