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Airdroid 3.1.3 Script Insertion

Airdroid 3.1.3 Script Insertion
Posted Jul 20, 2015
Authored by Hadji Samir, Vulnerability Laboratory | Site vulnerability-lab.com

Airdroid version 3.1.3 suffers from a malicious script insertion vulnerability.

tags | exploit
SHA-256 | 16bdfffa85eb8722d4f81f39619c9f5161666f6be0e5e6d7a1e8482054755700

Airdroid 3.1.3 Script Insertion

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Document Title:
Airdroid iOS, Android & Win 3.1.3 - Persistent Vulnerability

References (Source):

Release Date:

Vulnerability Laboratory ID (VL-ID):

Common Vulnerability Scoring System:

Product & Service Introduction:
AirDroid allows you to access wirelessly and for free on your Android phone or tablet from Windows, Mac or the Internet, and to control it.

(Copy of the Product Homepage: https://www.airdroid.com/de/ )

Abstract Advisory Information:
The Vulnerability Laboratory Core Research Team discovered an application-side input validation web vulnerability in the official SandStudio AirDroid (windows, ios and android) mobile web-application.

Vulnerability Disclosure Timeline:
2015-07-05: Researcher Notification & Coordination (Hadji Samir)
2015-07-06: Vendor Notification (Security Team)
2015-07-20: Public Disclosure (Vulnerability Laboratory)

Discovery Status:

Affected Product(s):
Sand Studio
Product: AirDroid iOS Application (Andoird, Windows, MacOS & Web) 3.1.3

Exploitation Technique:

Severity Level:

Technical Details & Description:
A persistent input validation web vulnerability has been discovered in the official SandStudio AirDroid (windows, ios and android) mobile web-application.
The vulnerability allows remote attacker or low privilege user accounts to inject malicious codes to the application-side of the affected mobile web-application.

The vulnerability is located in the send messages and the send message with an attached file module. Remote attackers with low privilege user account are able to upload file name
with malicious strings like ``><script>alert(1).txt. On the arrival inbox occurs the execution of the malicious code that compromises the other target system/device user account.
The vulnerability is located on the application-side and the request method to inject is POST.

The security risk of the application-side web vulnerability is estimated as medium with a cvss (common vulnerability scoring system) count of 3.9.
Exploitation of the application-side web vulnerability requires a low privilege web-application user account and low user interaction.
Successful exploitation of the vulnerabilities results in persistent phishing mails, session hijacking, persistent external redirect to malicious
sources and application-side manipulation of affected or connected module context.

Request Method(s):
[+] POST

Vulnerable Module(s):
[+] Send Message

Vulnerable Parameter(s):
[+] filename

Affected Module(s):
[+] Message Inbox

Proof of Concept (PoC):
The vulnerability can be exploited by remote attackers with low privilege application user account and low user interaction (click).
For security demonstration or to reproduce the vulnerability follow the provided information and steps below to continue.

<span class="name">"><"><script>alert(document.cookie).txt< span="">[PERSISTENT INJECTED SCRIPT CODE]
<span class="progress-rate">100%</span>
<a class="attach-del-icon"></a>

--- PoC Session Logs [POST] ---
11:13:00.993[0ms][total 0ms] Status: pending[]
POST https://upload.airdroid.com/sms/attachment/?fn=%22%3E%3Cscript%3Ealert(document.cookie).txt&d=&after=0&rtype=0&origin=http%3A%2F%2Fweb.airdroid.com&country=DZ&fname=%22%3E%3Cscript%3Ealert(document.cookie).txt
Load Flags[LOAD_BYPASS_CACHE ] Content Size[unknown] Mime Type[unknown]
Request Headers:
User-Agent[Mozilla/5.0 (X11; Linux i686; rv:39.0) Gecko/20100101 Firefox/39.0]
Accept-Encoding[gzip, deflate]
Cookie[_SESSION=0b484eb230f27c004a7e990bace6175a416b58ed-%00_TS%3A1438769709%00; _ga=GA1.2.1046706455.1436177514; _gat=1; account_sid=c51d21b583ce76c04c8d4fa5a5c7496e; account_info=aW5mby5kaW1hbmV0QGdtYWlsLmNvbQ%3D%3D%2C63b971b729a756a3c1eb0fec6cccb736%2C9731220%2C59fd7af875fa5434a86e5397c79380d2]
Post Data:

Note: We demonstrated the poc by usage of the web-app but the local app is also vulnerable to the same issue!

Solution - Fix & Patch:
The vulnerbaility can be patched by a secure parse and encode of the vulnerable filename value in the send message module with the attach file function.

Security Risk:
The security risk of the application-side input validation web vulnerability in the airdroid app is estimated as medium. (CVSS 3.9)

Credits & Authors:
Vulnerability Laboratory [Research Team] - Hadji Samir [samir@evolution-sec.com]

Disclaimer & Information:
The information provided in this advisory is provided as it is without any warranty. Vulnerability Lab disclaims all warranties, either expressed
or implied, including the warranties of merchantability and capability for a particular purpose. Vulnerability-Lab or its suppliers are not liable
in any case of damage, including direct, indirect, incidental, consequential loss of business profits or special damages, even if Vulnerability-Lab
or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for
consequential or incidental damages so the foregoing limitation may not apply. We do not approve or encourage anybody to break any vendor licenses,
policies, deface websites, hack into databases or trade with fraud/stolen material.

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