CVE-2017-18087 : Vulnerability Insights and Analysis

Atlassian Bitbucket Server versions 5.1.0 to 5.4.1 are vulnerable to remote code execution due to a file writing issue.

Understanding CVE-2017-18087

This CVE involves a vulnerability in the download commit resource of Atlassian Bitbucket Server.

What is CVE-2017-18087?

The vulnerability allows remote attackers to write files to disk, potentially leading to code execution. It can be exploited when a vulnerable version of git is in use. Additionally, attackers can exploit an argument injection vulnerability in the 'at' parameter.

The Impact of CVE-2017-18087

Remote attackers can write files to disk, potentially leading to code execution.
Attackers can exploit the vulnerability to determine the existence of internal services.

Technical Details of CVE-2017-18087

The technical details of this CVE are as follows:

Vulnerability Description

The vulnerability allows remote attackers to write files to disk, potentially leading to code execution.

Affected Systems and Versions

Bitbucket Server versions from 5.1.0 to 5.4.1 are affected.

Exploitation Mechanism

Attackers can exploit the vulnerability by writing files to disk and potentially gaining code execution.

Mitigation and Prevention

Protect your systems from CVE-2017-18087 with the following steps:

Immediate Steps to Take

Update Bitbucket Server to versions 5.1.7, 5.2.5, 5.3.3, or 5.4.1 to mitigate the vulnerability.
Monitor for any unauthorized file writing activities.

Long-Term Security Practices

Regularly update and patch software to prevent known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.
Conduct regular security assessments and audits.

Patching and Updates

Apply the latest patches and updates provided by Atlassian to address the CVE-2017-18087 vulnerability.