CWE-379: Creation of Temporary File in Directory with Insecure Permissions
CWE版本: 4.18
更新日期: 2025-09-09
弱点描述
The product creates a temporary file in a directory whose permissions allow unintended actors to determine the file's existence or otherwise access that file.
扩展描述
On some operating systems, the fact that the temporary file exists may be apparent to any user with sufficient privileges to access that directory. Since the file is visible, the application that is using the temporary file could be known. If one has access to list the processes on the system, the attacker has gained information about what the user is doing at that time. By correlating this with the applications the user is running, an attacker could potentially discover what a user's actions are. From this, higher levels of security could be breached.
常见后果
影响范围: Confidentiality
技术影响: Read Application Data
说明: Since the file is visible and the application which is using the temp file could be known, the attacker has gained information about what the user is doing at that time.
潜在缓解措施
阶段: Requirements
描述: Many contemporary languages have functions which properly handle this condition. Older C temp file functions are especially susceptible.
阶段: Implementation
描述: Try to store sensitive tempfiles in a directory which is not world readable -- i.e., per-user directories.
阶段: Implementation
描述: Avoid using vulnerable temp file functions.
检测方法
方法: Automated Static Analysis
Automated static analysis, commonly referred to as Static Application Security Testing (SAST), can find some instances of this weakness by analyzing source code (or binary/compiled code) without having to execute it. Typically, this is done by building a model of data flow and control flow, then searching for potentially-vulnerable patterns that connect "sources" (origins of input) with "sinks" (destinations where the data interacts with external components, a lower layer such as the OS, etc.)
有效性: High
观察示例
参考: CVE-2022-27818
A hotkey daemon written in Rust creates a domain socket file underneath /tmp, which is accessible by any user.
参考: CVE-2021-21290
A Java-based application for a rapid-development framework uses File.createTempFile() to create a random temporary file with insecure default permissions.
引入模式
| 阶段 | 说明 |
|---|---|
| Implementation | - |
适用平台
编程语言
分类映射
| 分类名称 | 条目ID | 条目名称 | 映射适配度 |
|---|---|---|---|
| CLASP | - | Guessed or visible temporary file | - |
| CERT C Secure Coding | FIO15-C | Ensure that file operations are performed in a secure directory | - |