what you don't know can hurt you

ProjectPier 0.8.8 Shell Upload

ProjectPier 0.8.8 Shell Upload
Posted Oct 2, 2012
Authored by BlackHawk

ProjectPier versions 0.8.8 and below suffers from a remote shell upload vulnerability.

tags | exploit, remote, shell
MD5 | 90ac84892750f2b07c4583fc5e2d90ee

ProjectPier 0.8.8 Shell Upload

Change Mirror Download
ProjectPier <= 0.8.8 Remote Code Execution by BlackHawk

Thanks to alisael for the time spent together. Half credits goes to her ;)

01/11/2012
ProjectPier come with a upload.php file under ./tools/, that is the GUI for upload_file.php

----------------------------
<?php
header("Content-Type: text/plain");

if ($_FILES["file"]["error"] > 0) {
echo $_FILES["file"]["error"] . " " . $_FILES["file"]["name"] . " " . $_FILES["file"]["tmp_name"];
} else {

$folder = rtrim( './upload/' . $_POST['folder'] , '/');
@mkdir($folder, 0777, true);

$seq = str_pad((int) $_POST["part"],4,"0",STR_PAD_LEFT);
move_uploaded_file($_FILES["file"]["tmp_name"],
$folder . '/' . $_FILES["file"]["name"] . '-' . $seq ); // <-- XXXX
echo $_FILES["file"]["error"] . " " . $folder . '/' . $_FILES["file"]["name"] . '-' . $seq;
}
?>

-----------------------------

the file is uploaded in a fresh made dir, with the original name PLUS a minus (-) PLUS a sequence of 4 digits.
As Apache, if the filename got 2 extension (filename.one.two), when do not recognize the exstension (two), try to recognize the first one (one), and act as it's the correct one, you just need to rename a PHP shell in:

filename.php.1

and then call directly the file from the browser.

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