CWE-824 使用未经初始化的指针

Access of Uninitialized Pointer

结构: Simple

Abstraction: Base

状态: Incomplete

被利用可能性: unkown

基本描述

The program accesses or uses a pointer that has not been initialized.

扩展描述

If the pointer contains an uninitialized value, then the value might not point to a valid memory location. This could cause the program to read from or write to unexpected memory locations, leading to a denial of service. If the uninitialized pointer is used as a function call, then arbitrary functions could be invoked. If an attacker can influence the portion of uninitialized memory that is contained in the pointer, this weakness could be leveraged to execute code or perform other attacks.

Depending on memory layout, associated memory management behaviors, and program operation, the attacker might be able to influence the contents of the uninitialized pointer, thus gaining more fine-grained control of the memory location to be accessed.

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: 1003 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 uninitialized 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 uninitialized pointer references a memory location that is not accessible to the program, or points to a location that is "malformed" (such as NULL) or larger than expected by a read or write operation, then a crash may occur.
['Integrity', 'Confidentiality', 'Availability']	Execute Unauthorized Code or Commands	If the uninitialized 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-2010-0211	chain: unchecked return value (CWE-252) leads to free of invalid, uninitialized pointer (CWE-824).	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2010-0211
CVE-2009-2768	Pointer in structure is not initialized, leading to NULL pointer dereference (CWE-476) and system crash.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-2768
CVE-2009-1721	Free of an uninitialized pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1721
CVE-2009-1415	Improper handling of invalid signatures leads to free of invalid pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-1415
CVE-2009-0846	Invalid encoding triggers free of uninitialized pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0846
CVE-2009-0040	Crafted PNG image leads to free of uninitialized pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0040
CVE-2008-2934	Crafted GIF image leads to free of uninitialized pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-2934
CVE-2007-4682	Access of uninitialized pointer might lead to code execution.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4682
CVE-2007-4639	Step-based manipulation: invocation of debugging function before the primary initialization function leads to access of an uninitialized pointer and code execution.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4639
CVE-2007-4000	Unchecked return values can lead to a write to an uninitialized pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4000
CVE-2007-2442	zero-length input leads to free of uninitialized pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-2442
CVE-2007-1213	Crafted font leads to uninitialized function pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-1213
CVE-2006-6143	Uninitialized function pointer in freed memory is invoked	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6143
CVE-2006-4175	LDAP server mishandles malformed BER queries, leading to free of uninitialized memory	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-4175
CVE-2006-0054	Firewall can crash with certain ICMP packets that trigger access of an uninitialized pointer.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-0054
CVE-2003-1201	LDAP server does not initialize members of structs, which leads to free of uninitialized pointer if an LDAP request fails.	https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2003-1201

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.

引用

• REF-62 The Art of Software Security Assessment

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