Port 3690 – Subversion (Apache Subversion)

Why It’s Open

Port 3690 is the default port for Subversion (SVN) version control system. This port handles both encrypted and unencrypted SVN protocol communications, allowing developers to commit, update, and manage source code and other versioned resources in repositories.

Organizations use this port to provide access to SVN repositories for development teams. While Git has largely superseded SVN in modern development environments, many legacy codebases and enterprises still rely on SVN infrastructure.

Common Risks

• Authentication Weaknesses Default or weak credentials can be exploited.
• Clear-text Transmission Unencrypted SVN can expose source code and credentials.
• Repository Tampering Unauthorized modifications to source code possible.
• Information Disclosure Source code and commit history exposed.
• Access Control Issues Misconfigured permissions enable unauthorized access.

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Enumeration & Testing

Check if it’s open:

nmap -sT -p 3690

Test SVN connection:

svn info svn://

List repositories:

svn list svn://

What to Look For

Mitigation

• Use HTTPS
  Configure SVN to use SSL/TLS encryption.
• Strong Authentication
  Implement strict credential policies.
• Access Controls
  Set appropriate repository permissions.
• Network Restrictions
  Limit access to development networks.
• Regular Backups
  Maintain secure repository backups.

TL;DR

• Port 3690 = Subversion (SVN)
• Source code version control
• Legacy but still common
• Needs encryption and access controls

Known CVEs and Exploits

• CVE-2022-29249 – Subversion server path traversal vulnerability
• CVE-2020-17525 – Apache Subversion arbitrary code execution