| Título | zhayujie chatgpt-on-wechat 2.1.0 Server-Side Request Forgery (SSRF) (CWE-918) |
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| Descripción | # Technical Details
A Server-Side Request Forgery vulnerability exists in the `[Vision._download_to_data_url]` method in `agent/tools/vision/vision.py` of chatgpt-on-wechat.
The application fails to validate attacker-controlled remote image URLs before performing a server-side fetch. `Vision.execute()` accepts the `image` argument, passes it into `_build_image_content(image)`, and HTTP(S) inputs are routed directly into `_download_to_data_url()` which executes `requests.get(url, timeout=30)` without loopback, RFC1918, link-local, DNS-resolution, or redirect-chain validation.
# Vulnerable Code
File: `agent/tools/vision/vision.py`
Method: `Vision.execute`, `_build_image_content`, `_download_to_data_url`
Why: The code accepts arbitrary `http://` and `https://` image URLs and fetches them directly with `requests.get()` before any destination policy is enforced, allowing requests to internal or localhost resources.
# Reproduction
1. Configure at least one vision-capable provider so execution reaches the fetch path.
2. Run the supplied verification script with a canary URL such as `http://127.0.0.1:<port>/canary.png`.
3. Observe the local canary server receives a GET request from `python-requests` before the provider later fails upstream.
# Impact
- Allows attackers to induce server-side requests from the agent host to localhost or internal-network targets.
- Can disclose or interact with internal HTTP services reachable from the host running the agent. |
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| Fuente | ⚠️ https://github.com/zhayujie/CowAgent/issues/2878 |
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| Usuario | Eric-e (UID 97581) |
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| Sumisión | 2026-06-11 10:39 (hace 1 mes) |
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| Moderación | 2026-07-13 19:28 (1 month later) |
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| Estado | Aceptado |
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| Entrada de VulDB | 378130 [zhayujie chatgpt-on-wechat CowAgent hasta 2.1.1 Vision Tool vision.py Vision._download_to_data_url image escalada de privilegios] |
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| Puntos | 20 |
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