Path traversal in Parallels Remote Application Server



Published: 2018-02-28 | Updated: 2020-01-10
Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2017-9447
CWE-ID CWE-22
Exploitation vector Network
Public exploit Public exploit code for vulnerability #1 is available.
Vulnerable software
Subscribe 		Parallels Remote Application Server
Server applications / Application servers

Vendor Parallels

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Path traversal

EUVDB-ID: #VU24194

Risk: Medium

CVSSv3.1: 6.7 [CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C]

CVE-ID: CVE-2017-9447

CWE-ID: CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

Exploit availability: Yes

Description

The vulnerability allows a remote attacker to perform directory traversal attacks.

The vulnerability exists due to input validation error when processing directory traversal sequences (e.g. ".\\\") appended after the "RASHTML5Gateway" URL. A remote attacker can send a specially crafted HTTP request and read arbitrary files on the system.

PoC:

https://[host]/RASHTML5Gateway//..\\\..\\\..\\\..\\\..\\\windows\win.ini

Mitigation

Install update from vendor's website.

Vulnerable software versions

Parallels Remote Application Server: 15.5.15566 - 15.5.16140

External links

http://blog.runesec.com/2018/02/22/parallels-ras-path-traversal/


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability. However, proof of concept for this vulnerability is available.



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