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Category:   Application (VPN)  >   OpenVPN Vendors:   openvpn.net
OpenVPN Multiple Flaws Let Remote Users Obtain Potentially Sensitive Information, Deny Service, and Execute Arbitrary Code
SecurityTracker Alert ID:  1038768
SecurityTracker URL:  http://securitytracker.com/id/1038768
CVE Reference:   CVE-2017-7508, CVE-2017-7520, CVE-2017-7521, CVE-2017-7522   (Links to External Site)
Date:  Jun 22 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:   The vendor has issued a fix (2.3.17, 2.4.3).

The vendor advisory is available at:

https://community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243

Vendor URL:  community.openvpn.net/openvpn/wiki/VulnerabilitiesFixedInOpenVPN243 (Links to External Site)
Cause:   Access control error, Boundary error, Exception handling error, Input validation error
Underlying OS:  Linux (Any), UNIX (Any)

Message History:   This archive entry has one or more follow-up message(s) listed below.
Jun 22 2017 (Ubuntu Issues Fix) OpenVPN Multiple Flaws Let Remote Users Obtain Potentially Sensitive Information, Deny Service, and Execute Arbitrary Code
Ubuntu has issued a fix for Ubuntu Linux 14.04 LTS, 16.04 LTS, 16.10, and 17.04.
Aug 8 2017 (Ubuntu Issues Fix) OpenVPN Multiple Flaws Let Remote Users Obtain Potentially Sensitive Information, Deny Service, and Execute Arbitrary Code
Ubuntu has issued a fix for Ubuntu Linux 12.04 ESM.



 Source Message Contents

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


Guido Vranken discovered that OpenVPN incorrectly handled certain malformed
IPv6 packets. A remote attacker could use this issue to cause OpenVPN to
crash, resulting in a denial of service. (CVE-2017-7508)

Guido Vranken discovered that OpenVPN incorrectly handled memory. A remote
attacker could use this issue to cause OpenVPN to crash, resulting in a
denial of service. (CVE-2017-7512)

Guido Vranken discovered that OpenVPN incorrectly handled an HTTP proxy
with NTLM authentication. A remote attacker could use this issue to cause
OpenVPN clients to crash, resulting in a denial of service, or possibly
expose sensitive memory contents. (CVE-2017-7520)

Guido Vranken discovered that OpenVPN incorrectly handled certain x509
extensions. A remote attacker could use this issue to cause OpenVPN to
crash, resulting in a denial of service. (CVE-2017-7521)

 
 


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