CVE-2020-25705 : What You Need to Know

A flaw in ICMP packets in the Linux kernel may allow an attacker to quickly scan open UDP ports. This flaw affects Siemens Linux Based Products and various versions of different components.

Understanding CVE-2020-25705

This CVE identifies a vulnerability in the Linux kernel that impacts several Siemens products.

What is CVE-2020-25705?

The vulnerability in ICMP packets in the Linux kernel enables an off-path remote attacker to bypass source port UDP randomization, affecting various Siemens products.

The Impact of CVE-2020-25705

Allows attackers to scan open UDP ports quickly
Bypasses source port UDP randomization
Indirectly affects software relying on UDP source port randomization

Technical Details of CVE-2020-25705

This section provides technical insights into the vulnerability.

Vulnerability Description

The flaw in ICMP packets in the Linux kernel allows off-path remote attackers to bypass source port UDP randomization.

Affected Systems and Versions

Siemens RUGGEDCOM RM1224: All versions between v5.0 and v6.4
SCALANCE M-800: All versions between v5.0 and v6.4
SCALANCE S615: All versions between v5.0 and v6.4
SCALANCE SC-600: All versions prior to v2.1.3
SCALANCE W1750D: v8.3.0.1, v8.6.0, and v8.7.0
SIMATIC Cloud Connect 7: All versions
SIMATIC MV500 Family: All versions
Various SIMATIC NET CP versions
SINEMA Remote Connect Server: All versions prior to v3.0 SP1
TIM 1531 IRC: All versions

Exploitation Mechanism

The vulnerability allows attackers to exploit ICMP packets in the Linux kernel to scan open UDP ports and bypass source port UDP randomization.

Mitigation and Prevention

Protecting systems from CVE-2020-25705 is crucial for maintaining security.

Immediate Steps to Take

Apply patches provided by Siemens promptly
Monitor network traffic for any suspicious activities
Implement network segmentation to limit the attack surface

Long-Term Security Practices

Regularly update and patch all software and firmware
Conduct security assessments and penetration testing
Educate users and IT staff on cybersecurity best practices

Patching and Updates

Siemens may release patches to address the vulnerability
Stay informed about security advisories and updates from Siemens