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XXE in docx/xlsx: important warning on recompression

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Alexandre ZANNI 2024-10-28 16:18:35 +01:00 committed by GitHub
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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
@ -755,4 +757,4 @@ From https://gist.github.com/infosec-au/2c60dc493053ead1af42de1ca3bdcc79
* [XXE: How to become a Jedi](https://2017.zeronights.org/wp-content/uploads/materials/ZN17_yarbabin_XXE_Jedi_Babin.pdf) - Zeronights 2017 - Yaroslav Babin
* [Payloads for Cisco and Citrix - Arseniy Sharoglazov](https://mohemiv.com/all/exploiting-xxe-with-local-dtd-files/)
* [Data exfiltration using XXE on a hardened server - Ritik Singh - Jan 29, 2022](https://infosecwriteups.com/data-exfiltration-using-xxe-on-a-hardened-server-ef3a3e5893ac)
* [REDTEAM TALES 0X1: SOAPY XXE - Uncover and exploit XXE vulnerability in SOAP WS - optistream](https://www.optistream.io/blogs/tech/redteam-stories-1-soapy-xxe)
* [REDTEAM TALES 0X1: SOAPY XXE - Uncover and exploit XXE vulnerability in SOAP WS - optistream](https://www.optistream.io/blogs/tech/redteam-stories-1-soapy-xxe)