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Category:   Application (VPN)  >   OpenVPN Vendors:   openvpn.net
(Ubuntu Issues Fix) OpenVPN Multiple Flaws Let Remote Users Obtain Potentially Sensitive Information, Deny Service, and Execute Arbitrary Code
SecurityTracker Alert ID:  1039082
SecurityTracker URL:  http://securitytracker.com/id/1039082
CVE Reference:   CVE-2017-7520   (Links to External Site)
Date:  Aug 8 2017
Impact:   Denial of service via network, Disclosure of system information, Disclosure of user information, Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Multiple vulnerabilities were reported in OpenVPN. A remote user can cause the target service to crash. A remote user can execute arbitrary code on the target system. A remote user can obtain potentially sensitive information on the target system.

A remote user can send a specially crafted IPv6 packet to trigger an error in mss_fixup_dowork() and cause the target OpenVPN service to crash [CVE-2017-7508].

A remote user (HTTP proxy server) can return specially crafted data to a connected OpenVPN client to trigger a null pointer dereference in establish_http_proxy_passthru() and obtain potentially sensitive information from the target client system [CVE-2017-7520].

A remote user can send specially crafted data to trigger a certificate parsing memory error and cause the target service to crash or potentially execute arbitrary code [CVE-2017-7521].

A remote user can send a specially crafted signed certificate to trigger a parsing error and cause the target service to crash [CVE-2017-7522]. Systems with the 'x509-track' configuration option set and compiled with mbed TLS/PolarSSL as the cryptography backend are affected. OpenVPN Versions 2.4.x are affected.

The original advisory is available at:

https://guidovranken.wordpress.com/2017/06/21/the-openvpn-post-audit-bug-bonanza/

Guido Vranken reported these vulnerabilities.

Impact:   A remote user can cause the target service to crash.

A remote user can execute arbitrary code on the target system.

A remote server can obtain potentially sensitive information from the target client system.

Solution:   Ubuntu has issued a fix for CVE-2017-7520.

The Ubuntu advisory is available at:

https://www.ubuntu.com/usn/usn-3339-1

Vendor URL:  www.ubuntu.com/usn/usn-3339-2 (Links to External Site)
Cause:   Access control error, Boundary error, Exception handling error, Input validation error
Underlying OS:  Linux (Ubuntu)
Underlying OS Comments:  12.04 ESM

Message History:   This archive entry is a follow-up to the message listed below.
Jun 22 2017 OpenVPN Multiple Flaws Let Remote Users Obtain Potentially Sensitive Information, Deny Service, and Execute Arbitrary Code



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