File Handling

Manieendar Mohan

Published on

19 Jun 2022

There are many web applications that are possibly vulnerable to file handling attacks because it fails to properly validate metadata. This may lead to attacks like file inclusion and remote code execution attacks. If an attacker gets access to the file system, he can perform any attacks on the server. The file system attacks can be exploited due to:-

Path Traversal attack
Insecure permission
Insecure Indexing
Unmapped files
Temporary files
PHP include()
File upload
old and unreferenced files

Impact

The impacts include:-

File handling attacks
Data Breach

Mitigation / Precaution

Beagle recommends the following fixes:-

Edit the source code to ensure that input is properly validated
Make a list of accepted filenames and restrict the input to that list
Restrict file types accepted for upload
Change the permissions on the upload folder so the files within it are not executable.

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