CAPEC-92: Forced Integer Overflow
CAPEC版本: 3.9
更新日期: 2023-01-24
攻击模式描述
This attack forces an integer variable to go out of range. The integer variable is often used as an offset such as size of memory allocation or similarly. The attacker would typically control the value of such variable and try to get it out of range. For instance the integer in question is incremented past the maximum possible value, it may wrap to become a very small, or negative number, therefore providing a very incorrect value which can lead to unexpected behavior. At worst the attacker can execute arbitrary code.
执行流程
步骤 1 Explore
The first step is exploratory meaning the attacker looks for an integer variable that they can control.
步骤 2 Experiment
The attacker finds an integer variable that they can write into or manipulate and try to get the value of the integer out of the possible range.
步骤 3 Exploit
The integer variable is forced to have a value out of range which set its final value to an unexpected value.
步骤 4 Exploit
The target host acts on the data and unexpected behavior may happen.
前提条件
- The attacker can manipulate the value of an integer variable utilized by the target host.
- The target host does not do proper range checking on the variable before utilizing it.
- When the integer variable is incremented or decremented to an out of range value, it gets a very different value (e.g. very small or negative number)
所需技能
后果影响
影响范围: Integrity
技术影响: Modify Data
影响范围: Confidentiality Access Control Authorization
技术影响: Gain Privileges
影响范围: Confidentiality Integrity Availability
技术影响: Execute Unauthorized Commands
说明: Run Arbitrary Code
影响范围: Confidentiality
技术影响: Read Data
影响范围: Availability
技术影响: Unreliable Execution
缓解措施
Use a language or compiler that performs automatic bounds checking.
Carefully review the service's implementation before making it available to user. For instance you can use manual or automated code review to uncover vulnerabilities such as integer overflow.
Use an abstraction library to abstract away risky APIs. Not a complete solution.
Always do bound checking before consuming user input data.
示例实例
Integer overflow in the ProcAuWriteElement function in server/dia/audispatch.c in Network Audio System (NAS) before 1.8a SVN 237 allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a large max_samples value. See also: CVE-2007-1544
分类映射
| 分类名称 | 条目ID | 条目名称 |
|---|---|---|
| WASC | 03 | Integer Overflows |