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Merge pull request #752 from noraj/patch-2

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XXE in docx/xlsx: important warning on recompression
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Swissky 2024-10-28 17:03:39 +01:00 committed by GitHub
commit 98db867333
No known key found for this signature in database
GPG Key ID: B5690EEEBB952194
1 changed files with 4 additions and 2 deletions
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XXE Injection/README.md
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@ -639,9 +639,11 @@ Rebuild Excel file:
```
$ cd XXE
$ 7z u ../xxe.xlsx *
$ zip -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`.
Add your blind XXE payload inside `xl/workbook.xml`.
```xml