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Merge pull request #824 from noraj/patch-2

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XXE zip recompression tips
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Swissky 2026-03-16 14:57:15 +01:00 committed by GitHub
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GPG key ID: B5690EEEBB952194
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XXE Injection/README.md
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@ -591,7 +591,7 @@ cd XXE
zip -r -u ../xxe.xlsx *
```
Warning: Use `zip -u` (<https://infozip.sourceforge.net/Zip.html>) and not `7z u` / `7za u` (<https://p7zip.sourceforge.net/>) or `7zz` (<https://www.7-zip.org/>) because they won't recompress it the same way and many Excel parsing libraries will fail to recognize it as a valid Excel file. A valid magic byte signature with (`file XXE.xlsx`) will be shown as `Microsoft Excel 2007+` (with `zip -u`) and an invalid one will be shown as `Microsoft OOXML`.
Warning: Use `zip -u` (<https://infozip.sourceforge.net/Zip.html>) and not `7z u` / `7za u` (<https://p7zip.sourceforge.net/>) or `7zz` (<https://www.7-zip.org/>) because they won't recompress it the same way and many Excel parsing libraries will fail to recognize it as a valid Excel file. A valid magic byte signature with (`file XXE.xlsx`) will be shown as `Microsoft Excel 2007+` (with `zip -u`) and an invalid one will be shown as `Microsoft OOXML`. Alternatively, with 7z you can specify the correct compression algorithm with: `7z a -tzip` to get the correct signature.
Add your blind XXE payload inside `xl/workbook.xml`.