CWE-179
Incorrect Behavior Order: Early Validation
2006-07-19
00h00 +00:00
00h00 +00:00
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Tên: Incorrect Behavior Order: Early Validation
The product validates input before applying protection mechanisms that modify the input.
Thông tin chung
Các cách xuất hiện
Implementation : Since early validation errors usually arise from improperly implemented defensive mechanisms, it is likely that these will be introduced more frequently as secure programming becomes implemented more widely.Nền tảng áp dụng
Ngôn ngữ
Lớp: Not Language-Specific (Undetermined)Hậu quả phổ biến
| Phạm vi | Tác động | Khả năng xảy ra |
|---|---|---|
| Access Control Integrity | Bypass Protection Mechanism, Execute Unauthorized Code or Commands Ghi chú: An attacker could bypass the protection mechanism by including dangerous inputs that are only produced after the modification (such as canonicalization and cleansing). This can be used to launch various attacks including injection, executing arbitrary code, or causing other unintended behavior. |
Ví dụ đã quan sát
| Tài liệu tham khảo | Mô tả |
|---|---|
CVE-2002-0433 | List files in web server using "*.ext" |
CVE-2003-0332 | Product modifies the first two letters of a filename extension after performing a security check, which allows remote attackers to bypass authentication via a filename with a .ats extension instead of a .hts extension. |
CVE-2002-0802 | Database consumes an extra character when processing a character that cannot be converted, which could remove an escape character from the query and make the application subject to SQL injection attacks. |
CVE-2000-0191 | Overlaps "fakechild/../realchild" |
CVE-2004-2363 | Product checks URI for "<" and other literal characters, but does it before hex decoding the URI, so "%3E" and other sequences are allowed. |
CVE-2002-0934 | Directory traversal vulnerability allows remote attackers to read or modify arbitrary files via invalid characters between two . (dot) characters, which are filtered and result in a ".." sequence. |
CVE-2003-0282 | Directory traversal vulnerability allows attackers to overwrite arbitrary files via invalid characters between two . (dot) characters, which are filtered and result in a ".." sequence. |
Các biện pháp giảm thiểu tiềm năng
Phases : ImplementationInputs should be decoded and canonicalized to the application's current internal representation before being validated (CWE-180). Make sure that the application does not decode the same input twice (CWE-174). Such errors could be used to bypass allowlist validation schemes by introducing dangerous inputs after they have been checked.
Ghi chú ánh xạ lỗ hổng
Lý do : This CWE entry is at the Base level of abstraction, which is a preferred level of abstraction for mapping to the root causes of vulnerabilities.Bình luận : Carefully read both the name and description to ensure that this mapping is an appropriate fit. Do not try to 'force' a mapping to a lower-level Base/Variant simply to comply with this preferred level of abstraction.
Mẫu tấn công liên quan
| ID CAPEC | Tên mẫu tấn công |
|---|---|
| CAPEC-3 | Using Leading 'Ghost' Character Sequences to Bypass Input Filters
Some APIs will strip certain leading characters from a string of parameters. An adversary can intentionally introduce leading "ghost" characters (extra characters that don't affect the validity of the request at the API layer) that enable the input to pass the filters and therefore process the adversary's input. This occurs when the targeted API will accept input data in several syntactic forms and interpret it in the equivalent semantic way, while the filter does not take into account the full spectrum of the syntactic forms acceptable to the targeted API. |
| CAPEC-43 | Exploiting Multiple Input Interpretation Layers
An attacker supplies the target software with input data that contains sequences of special characters designed to bypass input validation logic. This exploit relies on the target making multiples passes over the input data and processing a "layer" of special characters with each pass. In this manner, the attacker can disguise input that would otherwise be rejected as invalid by concealing it with layers of special/escape characters that are stripped off by subsequent processing steps. The goal is to first discover cases where the input validation layer executes before one or more parsing layers. That is, user input may go through the following logic in an application: |
| CAPEC-71 | Using Unicode Encoding to Bypass Validation Logic
An attacker may provide a Unicode string to a system component that is not Unicode aware and use that to circumvent the filter or cause the classifying mechanism to fail to properly understanding the request. That may allow the attacker to slip malicious data past the content filter and/or possibly cause the application to route the request incorrectly. |
Ghi chú
These errors are mostly reported in path traversal vulnerabilities, but the concept applies whenever validation occurs.Tài liệu tham khảo
REF-62
The Art of Software Security AssessmentMark Dowd, John McDonald, Justin Schuh.
Gửi
| Tên | Tổ chức | Ngày | Ngày phát hành | Version |
|---|---|---|---|---|
| PLOVER | Draft 3 |
Sửa đổi
| Tên | Tổ chức | Ngày | Bình luận |
|---|---|---|---|
| Eric Dalci | Cigital | updated Potential_Mitigations, Time_of_Introduction | |
| Veracode | Suggested OWASP Top Ten 2004 mapping | ||
| CWE Content Team | MITRE | updated Modes_of_Introduction, Relationships, Taxonomy_Mappings | |
| CWE Content Team | MITRE | updated Description | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Research_Gaps | |
| CWE Content Team | MITRE | updated Potential_Mitigations | |
| CWE Content Team | MITRE | updated Common_Consequences | |
| CWE Content Team | MITRE | updated Common_Consequences, Demonstrative_Examples, Observed_Examples, References, Relationships | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Applicable_Platforms | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Demonstrative_Examples, Potential_Mitigations, Relationships | |
| CWE Content Team | MITRE | updated Description | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Mapping_Notes | |
| CWE Content Team | MITRE | updated Observed_Examples, Weakness_Ordinalities | |
| CWE Content Team | MITRE | updated Common_Consequences, Description, Dimensions |
