Vulnerability Note VU#894897
NSIS Inetc plug-in fails to validate SSL certificates
Original Release date: 20 Mar 2015 | Last revised: 23 Mar 2015

Overview
The Intetc plugin for the NSIS installer fails to validate SSL certificates, which makes affected installers vulnerable to HTTPS spoofing.

Description
Inetc is a plugin for the NSIS installer software that provides the ability to download files from the internet. Although Inetc supports the ability to download files using the HTTPS protocol, it does not validate SSL certificate chains.

Impact
An attacker can spoof content retrieved using HTTPS. Depending on what the installer does with content retrieved over HTTPS, the impact can be as severe as arbitrary code execution with elevated privileges.

Solution
We are currently unaware of a practical solution to this problem. Please consider the following workarounds:
Only install software while connected to a trusted network
Because the Inetc plugin does not validate SSL certificates, any software installers that are NSIS-based should not be used while connected to a network that is either inherently untrusted, or one that has untrusted users on it.

Vendor Information (Learn More)

VendorStatusDate NotifiedDate UpdatedCERT/CCAffected-20 Mar 2015
DropboxAffected03 Mar 201520 Mar 2015
NullsoftAffected31 Jan 201125 Feb 2015
AVG Anti-virus SoftwareNot Affected25 Feb 201526 Feb 2015
Unify IncNot Affected25 Feb 201523 Mar 2015
7-Zip.orgUnknown25 Feb 201525 Feb 2015
AdobeUnknown25 Feb 201525 Feb 2015
AmazonUnknown25 Feb 201525 Feb 2015
AMDUnknown25 Feb 201525 Feb 2015
Debian GNU/LinuxUnknown25 Feb 201525 Feb 2015
DivX, Inc.Unknown25 Feb 201525 Feb 2015
EricssonUnknown25 Feb 201525 Feb 2015
FreeRADIUSUnknown25 Feb 201525 Feb 2015
GoogleUnknown25 Feb 201525 Feb 2015
Intel CorporationUnknown25 Feb 201525 Feb 2015If you are a vendor and your product is affected, let
us know.View More &raquo

CVSS Metrics (Learn More)

Group
Score
Vector

Base
7.3
AV:A/AC:M/Au:N/C:C/I:C/A:–

Temporal
7.3
E:H/RL:U/RC:C

Environmental
7.3
CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND

References

http://nsis.sourceforge.net
http://nsis.sourceforge.net/Inetc_plug-in
https://sourceforge.net/p/nsis/bugs/1022/
http://forums.winamp.com/showthread.php?p=3018645#post3018645

Credit

This vulnerability was reported by Will Dormann of the CERT/CC.
This document was written by Will Dormann.

Other Information

CVE IDs:
CVE-2015-0941

Date Public:
31 Jan 2011

Date First Published:
20 Mar 2015

Date Last Updated:
23 Mar 2015

Document Revision:
22

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