Resolve vulnerability: Relative Path Traversal

MR created from vulnerability: Relative Path Traversal

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Description:

Detected user input controlling a file path. An attacker could control the location of this file, to include going backwards in the directory with '../'.

To address this, ensure that user-controlled variables in file paths are sanitized. You may also consider using a utility method such as org.apache.commons.io.FilenameUtils.getName(...) to only retrieve the file name from the path.

Example of using org.apache.commons.io.FilenameUtils.getName(...) to only retrieve the file name from the path

String fileName = org.apache.commons.io.FilenameUtils.getName(userControlledInput);
File file = new File("/path/to/directory/" + fileName);

• Severity: critical
• Location: java-groovy-cmdi-groovyshell-taint.java:60

Analysis:

根据漏洞报告和源代码分析，这是一个真实的路径遍历漏洞（CWE-23）。问题出现在直接使用用户控制的输入file参数来创建File对象，这可能导致攻击者通过构造包含../的路径来访问系统上的任意文件。

虽然代码中有对script参数进行白名单检查，但对file参数没有类似的防护措施。在test1和test2方法中，多个地方直接使用了未经验证的用户输入来访问文件系统。

修复方案应该包括：

1. 使用FilenameUtils.getName()来提取文件名，防止路径遍历
2. 将文件限制在特定目录下
3. 添加白名单验证或文件存在性检查

Summary:

1. 报告的漏洞：相对路径遍历漏洞（CWE-23），攻击者可能通过构造包含../的路径来访问系统上的任意文件。

2. 修复方案：

   • 使用FilenameUtils.getName()提取安全的文件名
   • 将文件限制在特定目录(/safe/directory/path/)下
   • 添加路径验证，确保文件不会跳出指定目录
   • 对于非法路径抛出安全异常

3. 修复效果： 修复后的代码可以防止攻击者通过路径遍历访问系统上的任意文件，同时保持了原有的功能。所有文件操作都被限制在指定的安全目录下，并且路径会被规范化后进行验证。

Identifiers:

• A5:2017 - Broken Access Control
• java_traversal_rule-RelativePathTraversal
• A01:2021 - Broken Access Control
• CWE-23