CVE-2025-58355: Arbitrary File Overwrite in Soft Serve via SSH API — Analysis & Defense By CyberDudeBivash – Secure DevOps & Application Threat Intelligence Lead

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Executive Summary

A critical vulnerability has been identified in Soft Serve (a self-hostable Git server), versions 0.9.1 and earlier. CVE-2025-58355 allows remote attackers to create or overwrite arbitrary files through Soft Serve’s SSH API—posing serious integrity risks. The vulnerability is rated CVSS 3.1 score 7.7 (High), with scope-changing impact and none for confidentiality, but high for integrity.
This issue is patched in version 0.10.0, and immediate upgrades are strongly recommended.
Tenable®cvedetails.com advisories.gitlab.com

1. Affected Products & Vulnerability Details

Product: Soft Serve (self-hosted Git server)
Vulnerable versions: 0.9.1 and earlier
Attack vector: SSH API—unrestricted file path traversal and overwrite
CWE classification: CWE-22 (Path Traversal)
Fixed in: version 0.10.0Tenable®advisories.gitlab.com

2. Severity & Impact

CVSS v3.1 Score: 7.7 (High) — Network access, low complexity, privileges required (low), no user interaction, scope changed, integrity-only impactcvedetails.com app.opencve.io
EPSS: Not yet available, though public PoC existsfeedly.com

3. Exploitation Scenarios

Attackers can exploit this flaw via commands such as:

ssh -p23231 localhost repo commit icecream -- --output=/tmp/pwned

This results in creating or overriding files like /tmp/pwned—enabling arbitrary file deployment or remote execution.advisories.gitlab.com

4. Mitigation & Remediation

Upgrade Immediately to Soft Serve v0.10.0 or later.
Harden SSH API: Restrict repository and work directory access, enforce path sanitization.
Sandboxing: Run Soft Serve in a container or chroot with strict ACLs.
Monitor File Operations: Trigger alerts on SSH-based writes to sensitive system paths.
Isolate workloads: Ensure Soft Serve runs with least privileges and segregated from critical systems.

5. CyberDudeBivash Secure CI/CD Framework (CDB-DevDef)

Immutable Infrastructure: Use containers to isolate file system writes.
Static Path Enforcement: Deny runtime path overrides outside controlled directories.
Runtime Audits: Log suspicious SSH API path calls.
Dependency Hygiene: Track Git server versions via SCA tooling.
Automated Testing: Include fuzzing for file write paths in CI pipelines.

6. Executive & DevOps Guidance

Organizations using Soft Serve for internal Git hosting must assume risk and patch immediately. Unpatched instances risk arbitrary file manipulation that can escalate to malicious code execution or directory compromise.

CyberDudeBivash Call to Action

Defense Toolkit: Download the Secure Git Hosting Best Practices Playbook.
Request our Audit: App and infrastructure review for file path validation.
For continuous threat intelligence: Visit cyberbivash.blogspot.com
Services Offered: Secure DevOps pipeline consulting, automated vulnerability alerts, and risk-based prioritization.

#CVE202558355 #SoftServeVulnerability #PathTraversal #GitServerSecurity #DevSecOps #SecureCI_CD #CISO #CyberDefense #CyberDudeBivash

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