CVE-2020-27634 : Exploit Details and Defense Strategies

In Contiki 4.5, TCP ISNs are improperly random.

Understanding CVE-2020-27634

In Contiki 4.5, a vulnerability exists where TCP ISNs (Initial Sequence Numbers) are not properly randomized.

What is CVE-2020-27634?

This CVE refers to a specific issue in Contiki 4.5 where the generation of TCP ISNs is not adequately randomized, potentially leading to security vulnerabilities.

The Impact of CVE-2020-27634

The improper randomization of TCP ISNs can expose systems to risks such as predictable sequence numbers, which may facilitate various types of attacks, including TCP sequence prediction attacks.

Technical Details of CVE-2020-27634

In-depth technical information about the vulnerability.

Vulnerability Description

The vulnerability in Contiki 4.5 allows for the generation of TCP ISNs that are not sufficiently random, compromising the security of network communications.

Affected Systems and Versions

Vendor: n/a
Product: n/a
Versions: All versions are affected.

Exploitation Mechanism

Attackers could potentially exploit this vulnerability to launch TCP sequence prediction attacks, leading to unauthorized access or data manipulation.

Mitigation and Prevention

Best practices to mitigate the CVE-2020-27634 vulnerability.

Immediate Steps to Take

Implement network segmentation to limit the impact of potential attacks.
Monitor network traffic for any unusual patterns that may indicate exploitation attempts.
Consider using encryption protocols to protect sensitive data in transit.

Long-Term Security Practices

Regularly update and patch the affected systems to address known vulnerabilities.
Conduct security assessments and penetration testing to identify and remediate weaknesses in network security.

Patching and Updates

Apply patches or updates provided by the software vendor to fix the vulnerability and enhance system security.