CVE-2020-10188 : Security Advisory and Response

Telnet utility.c in netkit telnet through 0.17 has a buffer overflow vulnerability that allows remote attackers to execute arbitrary code.

Understanding CVE-2020-10188

This CVE involves a critical buffer overflow issue in the telnet utility.c component of netkit telnet, potentially enabling remote code execution.

What is CVE-2020-10188?

The vulnerability in utility.c in telnetd in netkit telnet through version 0.17 allows malicious actors to run arbitrary code through buffer overflow.

The Impact of CVE-2020-10188

The buffer overflow in netkit telnet's utility.c can be exploited by remote attackers to execute arbitrary code, posing a severe security risk.

Technical Details of CVE-2020-10188

This section delves into the technical aspects of the CVE.

Vulnerability Description

The vulnerability arises due to a buffer overflow in the netclear and nextitem functions of utility.c in telnetd in netkit telnet through version 0.17.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: All versions up to 0.17

Exploitation Mechanism

Attackers can exploit this vulnerability by sending short writes or urgent data, triggering the buffer overflow in the netclear and nextitem functions.

Mitigation and Prevention

Protecting systems from CVE-2020-10188 requires immediate actions and long-term security practices.

Immediate Steps to Take

Disable telnet services if not essential
Implement network segmentation to limit telnet exposure
Apply vendor patches or updates promptly

Long-Term Security Practices

Use secure protocols like SSH instead of telnet
Regularly monitor and audit network traffic for anomalies
Conduct security training for staff on identifying and reporting suspicious activities

Patching and Updates

Apply patches provided by the vendor to address the buffer overflow vulnerability in telnet utility.c