CVE-2020-35685 : What You Need to Know

An issue was discovered in HCC Nichestack 3.0 where the generation of Initial Sequence Numbers (ISNs) for TCP connections is derived from an insufficiently random source, potentially allowing attackers to determine ISNs and compromise connections.

Understanding CVE-2020-35685

What is CVE-2020-35685?

This CVE identifies a vulnerability in HCC Nichestack 3.0 related to the generation of Initial Sequence Numbers (ISNs) for TCP connections.

The Impact of CVE-2020-35685

The vulnerability could enable attackers to determine ISNs of current and future TCP connections, leading to potential hijacking of existing connections or spoofing of future ones.

Technical Details of CVE-2020-35685

Vulnerability Description

The issue arises from the insufficient randomness in the source used to generate ISNs for TCP connections in HCC Nichestack 3.0.

Affected Systems and Versions

Product: HCC Nichestack 3.0
Vendor: HCC
Version: All versions are affected

Exploitation Mechanism

Attackers can exploit this vulnerability to deduce ISNs, allowing them to compromise TCP connections.

Mitigation and Prevention

Immediate Steps to Take

Implement proper ISN generation following RFC 6528 guidelines
Monitor network traffic for any suspicious activity

Long-Term Security Practices

Regularly update and patch systems to address vulnerabilities
Conduct security audits and assessments to identify and mitigate risks

Patching and Updates

Apply patches or updates provided by HCC to fix the ISN generation issue