Remote Code Execution¶

Key facts

CVE-2025-27407 is a Critical (9.0) vulnerability: GitLab CE/EE Code Injection / Remote Code Execution. This entry ships a detection-only PoC.


CVE	CVE-2025-27407
Severity	Critical (9.0)
Detection / prevention	—
PoC	poc.py
Source	2025/CVE-2025-27407/

Details¶

Overview¶

Attribute	Value
CVE ID	CVE-2025-27407
Severity	Critical
CVSS Score	9.0
Affected Product	GitLab CE/EE
Vulnerability Type	Code Injection / Remote Code Execution
CWE	CWE-94

Description¶

Code injection vulnerability in graphql-ruby. Allows attacker-controlled authenticated user to execute code remotely via maliciously crafted project transfer using Direct Transfer feature.

Affected Versions¶

GitLab CE/EE 17.7.x <= 17.7.6, 17.8.x <= 17.8.4, 17.9.x <= 17.9.1

Verification Process¶

The PoC uses a multi-stage verification approach:

Step 1: Product/Version Detection (Passive)¶

[*] Query target endpoint
[*] Detect product signatures and extract version
[*] Check if version is in vulnerable range

Step 2: Active Vulnerability Testing¶

Method	Description	Detection
Error-based	Inject payloads that trigger error messages	Error indicators in response
Timing-based	Inject delay commands and measure response	Response time > baseline + delay
Response-based	Check for expected patterns in response	Pattern match in response body
Callback-based	Trigger OOB request to attacker server	HTTP request received

Verification Flow¶

┌─────────────────────────────────────────────────────────────┐
│                    Product Detection                         │
│  Query target → Detect product/version                      │
│  Check if version in vulnerable range                       │
└─────────────────────────────────────────────────────────────┘
                              ↓
┌─────────────────────────────────────────────────────────────┐
│               Active Vulnerability Testing                   │
│                                                              │
│  1. Error-based Test                                         │
│     └─ Send payload → Check for error indicators            │
│     └─ If error found → CONFIRMED VULNERABLE                │
│                                                              │
│  2. Timing-based Test                                        │
│     └─ Send delay payload → Measure response time           │
│     └─ If delayed → CONFIRMED VULNERABLE                    │
│                                                              │
│  3. Callback-based Test (if URL provided)                    │
│     └─ Send OOB payload → Check callback server             │
│     └─ If request received → CONFIRMED VULNERABLE           │
└─────────────────────────────────────────────────────────────┘

Usage¶

# Full vulnerability check (version + active testing)
python3 poc.py -t https://target.com -c

# Version-only check (passive, no payloads sent)
python3 poc.py -t https://target.com -c --version-only

# With OOB callback (most reliable)
python3 poc.py -t https://target.com -c --callback http://your-server.com

Mitigation¶

Upgrade to the latest patched version
Apply workarounds if patch unavailable
Monitor for exploitation attempts
Network segmentation to limit exposure

References¶

NVD Entry

Frequently asked questions¶

What is CVE-2025-27407?¶

CVE-2025-27407 is a Critical (9.0) vulnerability: GitLab CE/EE Code Injection / Remote Code Execution. This entry ships a detection-only PoC.

How do I detect CVE-2025-27407?¶

Run the detection-only PoC included with this entry against your Docker test lab to confirm whether a target is affected; pair it with your own IDS logging.

How do I block or mitigate CVE-2025-27407?¶

Upgrade to a fixed version per the vendor advisory; the NVD record lists the affected versions. Use the included PoC to verify your remediation.

For authorized security testing and research only. See the full source and NVD record.