CVE-2017-7183 : Security Advisory and Response

ExtraPuTTY versions 0.30 and earlier are vulnerable to a TFTP server exploit that can lead to a denial of service (DoS) attack.

Understanding CVE-2017-7183

This CVE involves a vulnerability in the TFTP server of ExtraPuTTY versions 0.30 and earlier, allowing remote attackers to crash the server through specific TFTP protocol messages.

What is CVE-2017-7183?

The vulnerability in ExtraPuTTY versions 0.30 and earlier enables remote attackers to execute a denial of service attack by sending large TFTP protocol messages during read or write operations.

The Impact of CVE-2017-7183

The exploitation of this vulnerability can result in a complete crash of the TFTP server, leading to a denial of service condition for legitimate users.

Technical Details of CVE-2017-7183

ExtraPuTTY versions 0.30 and earlier are susceptible to a TFTP server vulnerability that can be exploited by remote attackers.

Vulnerability Description

The TFTP server in ExtraPuTTY versions 0.30 and earlier can be crashed by sending oversized TFTP protocol messages during read or write operations.

Affected Systems and Versions

Product: ExtraPuTTY
Vendor: N/A
Versions affected: 0.30 and earlier

Exploitation Mechanism

Attackers can exploit this vulnerability by sending large TFTP protocol messages for read or write operations, causing the server to crash.

Mitigation and Prevention

To address CVE-2017-7183, users and administrators should take immediate and long-term security measures.

Immediate Steps to Take

Disable or restrict access to the TFTP server in ExtraPuTTY versions 0.30 and earlier.
Monitor network traffic for any suspicious TFTP protocol activities.

Long-Term Security Practices

Regularly update ExtraPuTTY to the latest version to patch known vulnerabilities.
Implement network segmentation to isolate critical systems from potential attacks.

Patching and Updates

Apply patches or updates provided by ExtraPuTTY to fix the TFTP server vulnerability and enhance overall security.