This patch addresses CSV formula injection vulnerabilities by ensuring
all Text::CSV instances use formula protection.
Changes made:
* Add formula => 'empty' to all Text::CSV constructors in:
- Koha::Patrons::Import
- Koha::BackgroundJob::ImportKBARTFile
- Koha::ERM::EUsage::CounterFile
The 'empty' formula mode causes potentially dangerous formulas (starting
with =, +, -, @) to be treated as empty strings rather than executed,
preventing CSV injection attacks while maintaining data integrity.
Security impact:
* Prevents execution of malicious formulas in CSV imports
* Protects against data exfiltration via CSV formula injection
* Maintains backward compatibility for legitimate CSV data
To test:
1. Apply the previous patch (author test)
2. Run:
$ ktd --shell
k$ prove xt/author/Text_CSV_Various.t
=> FAIL: Should show 3 files without formula protection
3. Apply this patch
4. Repeat 2
=> SUCCESS: All tests should now pass
5. Try importing CSV with formula content (=cmd|"/c calc",test,data)
=> SUCCESS: Formula content is rejected/emptied, not executed
6. Import normal CSV data
=> SUCCESS: Normal data imports correctly
7. Sign off :-D
Signed-off-by: David Cook <dcook@prosentient.com.au>
Signed-off-by: Paul Derscheid <paul.derscheid@lmscloud.de>
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