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XXE zip recompression tips

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Alexandre ZANNI
2026-03-16 11:49:21 +01:00
committed by GitHub
parent 497fbe925b
commit 8847706138
1 changed files with 1 additions and 1 deletions
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XXE Injection/README.md
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@@ -591,7 +591,7 @@ cd XXE
zip -r -u ../xxe.xlsx * 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`. Add your blind XXE payload inside `xl/workbook.xml`.