CWE-621
Variable Extraction Error
2007-05-07
00h00 +00:00
00h00 +00:00
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Tên: Variable Extraction Error
The product uses external input to determine the names of variables into which information is extracted, without verifying that the names of the specified variables are valid.
Thông tin chung
Các cách xuất hiện
ImplementationNền tảng áp dụng
Ngôn ngữ
Tên: PHP (Undetermined)Lớp: Interpreted (Undetermined)
Hậu quả phổ biến
| Phạm vi | Tác động | Khả năng xảy ra |
|---|---|---|
| Integrity | Modify Application Data Ghi chú: An attacker could cause the program to overwrite unintended variables. | |
| Integrity | Modify Application Data Ghi chú: When using PHP, calling extract() or import_request_variables() without the proper arguments could allow arbitrary global variables to be overwritten, including superglobals. |
Ví dụ đã quan sát
| Tài liệu tham khảo | Mô tả |
|---|---|
CVE-2006-7135 | extract issue enables file inclusion |
CVE-2006-7079 | Chain: PHP app uses extract for register_globals compatibility layer (CWE-621), enabling path traversal (CWE-22) |
CVE-2007-0649 | extract() buried in include files makes post-disclosure analysis confusing; original report had seemed incorrect. |
CVE-2006-6661 | extract() enables static code injection |
CVE-2006-2828 | import_request_variables() buried in include files makes post-disclosure analysis confusing |
Các biện pháp giảm thiểu tiềm năng
Phases : ImplementationUse allowlists of variable names that can be extracted.
Phases : Implementation
Consider refactoring your code to avoid extraction routines altogether.
Phases : Implementation
In PHP, call extract() with options such as EXTR_SKIP and EXTR_PREFIX_ALL; call import_request_variables() with a prefix argument. Note that these capabilities are not present in all PHP versions.
Ghi chú ánh xạ lỗ hổng
Lý do : This CWE entry is at the Variant 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.
Ghi chú
Probably under-reported for PHP. Seems under-studied for other interpreted languages.Gửi
| Tên | Tổ chức | Ngày | Ngày phát hành | Version |
|---|---|---|---|---|
| CWE Content Team | MITRE | Draft 6 |
Sửa đổi
| Tên | Tổ chức | Ngày | Bình luận |
|---|---|---|---|
| Eric Dalci | Cigital | updated Time_of_Introduction | |
| CWE Content Team | MITRE | updated Description, Relationships, Observed_Example, Other_Notes, Weakness_Ordinalities | |
| CWE Content Team | MITRE | updated Description | |
| CWE Content Team | MITRE | updated Common_Consequences | |
| CWE Content Team | MITRE | updated Common_Consequences, Demonstrative_Examples, Relationships | |
| CWE Content Team | MITRE | updated Potential_Mitigations | |
| CWE Content Team | MITRE | updated Demonstrative_Examples, Relationships | |
| CWE Content Team | MITRE | updated Description, Other_Notes | |
| CWE Content Team | MITRE | updated Relationships, Taxonomy_Mappings | |
| CWE Content Team | MITRE | updated Relationships | |
| CWE Content Team | MITRE | updated Potential_Mitigations | |
| CWE Content Team | MITRE | updated Research_Gaps | |
| CWE Content Team | MITRE | updated Relationships, Type | |
| CWE Content Team | MITRE | updated Mapping_Notes | |
| CWE Content Team | MITRE | updated Observed_Examples | |
| CWE Content Team | MITRE | updated Potential_Mitigations | |
| CWE Content Team | MITRE | updated Applicable_Platforms, Common_Consequences, Demonstrative_Examples, Description |
