T05 · Unauthorized Access and Privilege Escalation
Warning
- Location
image_reader.py:31- Finding
Unrestricted Local File Upload to an External API
- Content
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str: """将图片编码为 base64""" with open(image_path, "rb") as image_file: return base64.b64encode(image_file.read()).decode('utf-8') ``` ```python # 编码图片 base64_image = encode_image(image_path) ``` ```python { "type": "image_url", "image_url": { "url": f"data:image/png;base64,{base64_image}" } } ``` ```python response = client.chat.completions.create( model=model, messages=messages, temperature=0.7, max_tokens=64000 ) ``` ```python parser.add_argument('image_path', help='图片文件路径') parser.add_argument('--prompt', '-p', help='额外的分析提示', default=None) args = parser.parse_args() # 检查图片文件是否存在 if not os.path.exists(args.image_path): print(f"错误: 图片文件不存在: {args.image_path}") sys.exit(1) ``` ### Technical Analysis The program accepts an arbitrary filesystem path and checks only whether that path exists. It does not verify that the target is a regular file, that it is located in an approved directory, or that its content is a supported image format. The complete file is then read into memory, Base64-encoded, labeled as `image/png` regardless of its real type, and transmitted to the externally configured API endpoint. Base64 encoding is a legitimate and documented transport mechanism for multimodal API requests; it is not inherently a covert exfiltration technique. The security issue is the absence of controls around which local files may be encoded and uploaded. The process cannot read files beyond its operating-system permissions. Nevertheless, when invoked by an agent running with broader access than the requesting user, this behavior can cross a least-privilege bo ...[truncated 2033 chars]- Remediation
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