CAPEC-228
DTD Injection
2014-06-23
00h00 +00:00
00h00 +00:00
Cảnh báo cho một CAPEC
Luôn được thông báo về mọi thay đổi đối với một CAPEC cụ thể.
Mô tả CAPEC
An attacker injects malicious content into an application's DTD in an attempt to produce a negative technical impact. DTDs are used to describe how XML documents are processed. Certain malformed DTDs (for example, those with excessive entity expansion as described in CAPEC 197) can cause the XML parsers that process the DTDs to consume excessive resources resulting in resource depletion.
Thông tin CAPEC
Luồng thực thi
1) Explore
[Survey the target] Using a browser or an automated tool, an attacker records all instances of web services to process XML requests.
Kỹ thuật
- Use an automated tool to record all instances of URLs to process XML requests.
- Use a browser to manually explore the website and analyze how the application processes XML requests.
2) Explore
[Determine use of XML with DTDs] Examine application input to identify XML input that leverage the use of one or more DTDs.
Kỹ thuật
- Examine any available documentation for the application that discusses expected XML input.
- Exercise the application using XML input with and without a DTD specified. Failure without DTD likely indicates use of DTD.
3) Exploit
[Craft and inject XML containg malicious DTD payload]
Kỹ thuật
- Inject XML expansion attack that creates a Denial of Service impact on the targeted server using its DTD.
- Inject XML External Entity (XEE) attack that can cause the disclosure of confidential information, execute abitrary code, create a Denial of Service of the targeted server, or several other malicious impacts.
Điều kiện tiên quyết
The target must be running an XML based application that leverages DTDs.Các biện pháp giảm thiểu
Design: Sanitize incoming DTDs to prevent excessive expansion or other actions that could result in impacts like resource depletion.Implementation: Disallow the inclusion of DTDs as part of incoming messages.
Implementation: Use XML parsing tools that protect against DTD attacks.
Điểm yếu liên quan
| Tên điểm yếu | |
|---|---|
CWE-829 |
Inclusion of Functionality from Untrusted Control Sphere The product imports, requires, or includes executable functionality (such as a library) from a source that is outside of the intended control sphere. |
Tài liệu tham khảo
REF-86
DoS Flaw in SOAP DTD ParameterRyan Naraine.
http://www.internetnews.com/dev-news/article.php/3289191
Gửi
| Tên | Tổ chức | Ngày | Ngày phát hành |
|---|---|---|---|
| CAPEC Content Team | The MITRE Corporation |
Sửa đổi
| Tên | Tổ chức | Ngày | Bình luận |
|---|---|---|---|
| CAPEC Content Team | The MITRE Corporation | Updated Attack_Phases, Description, Description Summary, Solutions_and_Mitigations | |
| CAPEC Content Team | The MITRE Corporation | Updated Related_Weaknesses | |
| CAPEC Content Team | The MITRE Corporation | Updated Related_Attack_Patterns | |
| CAPEC Content Team | The MITRE Corporation | Updated Related_Attack_Patterns |
