CWE-822 非可信指针解引用

Untrusted Pointer Dereference

结构: Simple

Abstraction: Base

状态: Incomplete

被利用可能性: unkown

基本描述

The program obtains a value from an untrusted source, converts this value to a pointer, and dereferences the resulting pointer.

扩展描述

An attacker can supply a pointer for memory locations that the program is not expecting. If the pointer is dereferenced for a write operation, the attack might allow modification of critical program state variables, cause a crash, or execute code. If the dereferencing operation is for a read, then the attack might allow reading of sensitive data, cause a crash, or set a program variable to an unexpected value (since the value will be read from an unexpected memory location).

There are several variants of this weakness, including but not necessarily limited to:

相关缺陷

• cwe_Nature: ChildOf cwe_CWE_ID: 119 cwe_View_ID: 1000 cwe_Ordinal: Primary

• cwe_Nature: ChildOf cwe_CWE_ID: 119 cwe_View_ID: 699 cwe_Ordinal: Primary

• cwe_Nature: CanPrecede cwe_CWE_ID: 125 cwe_View_ID: 1000

• cwe_Nature: CanPrecede cwe_CWE_ID: 787 cwe_View_ID: 1000

常见的影响

范围	影响	注释
Confidentiality	Read Memory	If the untrusted pointer is used in a read operation, an attacker might be able to read sensitive portions of memory.
Availability	DoS: Crash, Exit, or Restart	If the untrusted pointer references a memory location that is not accessible to the program, or points to a location that is "malformed" or larger than expected by a read or write operation, the application may terminate unexpectedly.
['Integrity', 'Confidentiality', 'Availability']	['Execute Unauthorized Code or Commands', 'Modify Memory']	If the untrusted pointer is used in a function call, or points to unexpected data in a write operation, then code execution may be possible.

分析过的案例

标识	说明	链接
CVE-2007-5655	message-passing framework interprets values in packets as pointers, causing a crash.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-5655
CVE-2010-2299	labeled as a "type confusion" issue, also referred to as a "stale pointer." However, the bug ID says "contents are simply interpreted as a pointer... renderer ordinarily doesn't supply this pointer directly". The "handle" in the untrusted area is replaced in one function, but not another - thus also, effectively, exposure to wrong sphere (CWE-668).	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-2299
CVE-2009-1719	Untrusted dereference using undocumented constructor.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1719
CVE-2009-1250	An error code is incorrectly checked and interpreted as a pointer, leading to a crash.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1250
CVE-2009-0311	An untrusted value is obtained from a packet and directly called as a function pointer, leading to code execution.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0311
CVE-2010-1818	Undocumented attribute in multimedia software allows "unmarshaling" of an untrusted pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-1818
CVE-2010-3189	ActiveX control for security software accepts a parameter that is assumed to be an initialized pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-3189
CVE-2010-1253	Spreadsheet software treats certain record values that lead to "user-controlled pointer" (might be untrusted offset, not untrusted pointer).	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-1253

Notes

Maintenance
There are close relationships between incorrect pointer dereferences and other weaknesses related to buffer operations. There may not be sufficient community agreement regarding these relationships. Further study is needed to determine when these relationships are chains, composites, perspective/layering, or other types of relationships. As of September 2010, most of the relationships are being captured as chains.
Terminology
Many weaknesses related to pointer dereferences fall under the general term of "memory corruption" or "memory safety." As of September 2010, there is no commonly-used terminology that covers the lower-level variants.
Research Gap
Under-studied and probably under-reported as of September 2010. This weakness has been reported in high-visibility software, but applied vulnerability researchers have only been investigating it since approximately 2008, and there are only a few public reports. Few reports identify weaknesses at such a low level, which makes it more difficult to find and study real-world code examples.

相关攻击模式

• CAPEC-129

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