CVE-2020-27347 : Vulnerability Insights and Analysis

In tmux before version 3.1c, a stack-based buffer overflow vulnerability exists in the function input_csi_dispatch_sgr_colon() in file input.c, allowing exploitation through terminal output.

Understanding CVE-2020-27347

This CVE involves a high-severity vulnerability in tmux that could lead to a stack-based buffer overflow.

What is CVE-2020-27347?

CVE-2020-27347 is a vulnerability in tmux versions prior to 3.1c that allows for a stack-based buffer overflow via the input_csi_dispatch_sgr_colon() function.

The Impact of CVE-2020-27347

The vulnerability has a CVSS base score of 8.8, indicating a high severity level with significant impacts on confidentiality, integrity, and availability of affected systems.

Technical Details of CVE-2020-27347

This section provides detailed technical information about the vulnerability.

Vulnerability Description

The vulnerability in tmux before version 3.1c is due to a stack-based buffer overflow in the input_csi_dispatch_sgr_colon() function in file input.c.

Affected Systems and Versions

Affected Product: tmux
Affected Versions:
tmux < 3.1c (vendor: tmux)
3.1b-1ubuntu0.1 > tmux >= 3.0a-2ubuntu0.2 (vendor: Ubuntu)

Exploitation Mechanism

The vulnerability can be exploited by manipulating terminal output, potentially leading to arbitrary code execution or denial of service.

Mitigation and Prevention

To address CVE-2020-27347, follow these mitigation strategies:

Immediate Steps to Take

Update tmux to version 3.1c or later to eliminate the vulnerability.
Monitor vendor security advisories for patches and updates.

Long-Term Security Practices

Regularly update software and apply security patches promptly.
Implement least privilege access controls to limit the impact of potential exploits.
Conduct regular security assessments and penetration testing to identify and address vulnerabilities.

Patching and Updates

Apply patches provided by the vendor promptly to mitigate the vulnerability and enhance system security.