34814f787b
These links are no longer relevant since SANS now just link to CWE, and we already have links to CWEs.
91 lines
3.5 KiB
Plaintext
91 lines
3.5 KiB
Plaintext
include::../description.adoc[]
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include::../ask-yourself.adoc[]
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include::../recommended.adoc[]
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== Sensitive Code Example
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----
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public void setPermissions(String filePath) {
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Set<PosixFilePermission> perms = new HashSet<PosixFilePermission>();
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// user permission
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perms.add(PosixFilePermission.OWNER_READ);
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perms.add(PosixFilePermission.OWNER_WRITE);
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perms.add(PosixFilePermission.OWNER_EXECUTE);
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// group permissions
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perms.add(PosixFilePermission.GROUP_READ);
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perms.add(PosixFilePermission.GROUP_EXECUTE);
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// others permissions
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perms.add(PosixFilePermission.OTHERS_READ); // Sensitive
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perms.add(PosixFilePermission.OTHERS_WRITE); // Sensitive
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perms.add(PosixFilePermission.OTHERS_EXECUTE); // Sensitive
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Files.setPosixFilePermissions(Paths.get(filePath), perms);
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}
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----
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----
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public void setPermissionsUsingRuntimeExec(String filePath) {
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Runtime.getRuntime().exec("chmod 777 file.json"); // Sensitive
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}
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----
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----
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public void setOthersPermissionsHardCoded(String filePath ) {
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Files.setPosixFilePermissions(Paths.get(filePath), PosixFilePermissions.fromString("rwxrwxrwx")); // Sensitive
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}
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----
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== Compliant Solution
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On operating systems that implement POSIX standard. This will throw a ``++UnsupportedOperationException++`` on Windows.
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[source,java]
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----
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public void setPermissionsSafe(String filePath) throws IOException {
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Set<PosixFilePermission> perms = new HashSet<PosixFilePermission>();
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// user permission
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perms.add(PosixFilePermission.OWNER_READ);
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perms.add(PosixFilePermission.OWNER_WRITE);
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perms.add(PosixFilePermission.OWNER_EXECUTE);
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// group permissions
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perms.add(PosixFilePermission.GROUP_READ);
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perms.add(PosixFilePermission.GROUP_EXECUTE);
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// others permissions removed
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perms.remove(PosixFilePermission.OTHERS_READ); // Compliant
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perms.remove(PosixFilePermission.OTHERS_WRITE); // Compliant
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perms.remove(PosixFilePermission.OTHERS_EXECUTE); // Compliant
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Files.setPosixFilePermissions(Paths.get(filePath), perms);
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}
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----
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== See
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* https://owasp.org/Top10/A01_2021-Broken_Access_Control/[OWASP Top 10 2021 Category A1] - Broken Access Control
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* https://owasp.org/Top10/A04_2021-Insecure_Design/[OWASP Top 10 2021 Category A4] - Insecure Design
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* https://owasp.org/www-project-top-ten/2017/A5_2017-Broken_Access_Control[OWASP Top 10 2017 Category A5] - Broken Access Control
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* https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/02-Configuration_and_Deployment_Management_Testing/09-Test_File_Permission[OWASP File Permission]
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* https://cwe.mitre.org/data/definitions/732[MITRE, CWE-732] - Incorrect Permission Assignment for Critical Resource
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* https://cwe.mitre.org/data/definitions/266[MITRE, CWE-266] - Incorrect Privilege Assignment
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* https://wiki.sei.cmu.edu/confluence/display/java/FIO01-J.+Create+files+with+appropriate+access+permissions[CERT, FIO01-J.] - Create files with appropriate access permissions
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* https://wiki.sei.cmu.edu/confluence/display/c/FIO06-C.+Create+files+with+appropriate+access+permissions[CERT, FIO06-C.] - Create files with appropriate access permissions
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ifdef::env-github,rspecator-view[]
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'''
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== Implementation Specification
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(visible only on this page)
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include::../message.adoc[]
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'''
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== Comments And Links
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(visible only on this page)
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include::../comments-and-links.adoc[]
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endif::env-github,rspecator-view[]
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