Vulnerabilities / Threats

3/16/2017
05:15 PM
Sara Peters
Sara Peters
Quick Hits
Connect Directly
Twitter
RSS
E-Mail
100%
0%

US-CERT Warns That HTTPS Inspection Tools Weaken TLS

Turns out that man-in-the-middling your own traffic isn't the safest way to look for man-in-the-middle attacks.

HTTPS inspection tools are, in essence, a security team's authorized man-in-the-middle attacker: they intercept encrypted SSL/TLS traffic, in order to, for example, search it for malware that uses HTTPS to connect to malicious servers. However, in an alert today, US-CERT warned that HTTPS interception weakens TLS security, advising that organizations "carefully consider the pros and cons of such products before implementing."

Normally, a Web browser will alert a user to weak ciphers, deprecated protocol versions, or other reasons that certificates should not be trusted and connections might be dangerous. Once an HTTPS interception tool is introduced, however, the user must put all its trust in the tool.

From the US-CERT alert:

"Because the HTTPS inspection product manages the protocols, ciphers, and certificate chain, the product must perform the necessary HTTPS validations. Failure to perform proper validation or adequately convey the validation status increases the probability that the client will fall victim to MiTM attacks by malicious third parties."

Unfortunately, researchers have found these products lacking when it comes to those validation practices. For example - as noted in works cited in the advisory, "The Risks of SSL Inspection" and "The Security Impact of HTTPS Interception" - some HTTPS inspection products do incomplete validation of upstream certificates, others conduct complete validation but fail to convey the results back to the client, and others will complete communication to the target server before issuing warnings to the user.   

HTTPS interception capabilities are built into a wide variety of security tools, including firewalls, secure web gateways, data loss prevention products, and other applications. A partial list of potentially affected applications is available here

US-CERT recommends that organizations use the testing resources at BadSSL.com to determine whether or not their HTTPS interception applications are properly validating certificates and preventing connections to sites using weak cryptography.

"At a minimum," states the alert, "if any of the tests in the Certificate section of badssl.com prevent a client with direct Internet access from connecting, those same clients should also refuse the connection when connected to the Internet by way of an HTTPS inspection product." 

 

Sara Peters is Senior Editor at Dark Reading and formerly the editor-in-chief of Enterprise Efficiency. Prior that she was senior editor for the Computer Security Institute, writing and speaking about virtualization, identity management, cybersecurity law, and a myriad ... View Full Bio

Comment  | 
Print  | 
More Insights
Comments
Newest First  |  Oldest First  |  Threaded View
Page 1 / 6   >   >>
JOHAND828
50%
50%
JOHAND828,
User Rank: Apprentice
11/8/2017 | 7:36:44 AM
Great article! Very professional.
nice post thank you for sharing .
Mr Phen375
50%
50%
Mr Phen375,
User Rank: Apprentice
10/13/2017 | 11:25:37 AM
Where to find the list?
Where can I find the list to help hone down the possibilities for vulnerable devices?
TimTonne
50%
50%
TimTonne,
User Rank: Apprentice
9/11/2017 | 12:51:01 PM
re: strom-gas24
This website answer every question i had about correction. So , thank you.
LisaB845
50%
50%
LisaB845,
User Rank: Apprentice
8/29/2017 | 8:12:43 AM
re: professional logo design
this is very useful, thanks
Ludivina
50%
50%
Ludivina,
User Rank: Strategist
4/27/2017 | 2:48:14 PM
buy instagram followers web example
The HTTPS is pretty good when we talk about security, but it still needs improvements.
Shantaram
50%
50%
Shantaram,
User Rank: Ninja
4/24/2017 | 3:03:34 AM
Re: Great article! 192.168.0.1
Excellent post, i was happy to find it!
forskolinfuel
50%
50%
forskolinfuel,
User Rank: Apprentice
4/19/2017 | 11:21:21 PM
Re: phen375 review web example
A nice informative post thanks alot
marting123
50%
50%
marting123,
User Rank: Apprentice
4/17/2017 | 8:34:27 PM
Professional article.
You shared me the best information which I found for about 3 days, thanks much! Professional!
nidivivivi
50%
50%
nidivivivi,
User Rank: Apprentice
4/17/2017 | 8:28:23 PM
Thanks for your professional article!
The article - "US-CERT Warns That HTTPS Inspection Tools Weaken TLS", appreciate your great article, really very informative, perfect!
Shantaram
50%
50%
Shantaram,
User Rank: Ninja
4/17/2017 | 3:04:50 AM
Re: 192.168.l.l
It really important, thanks for sharing with us!
Page 1 / 6   >   >>
White House Cybersecurity Strategy at a Crossroads
Kelly Jackson Higgins, Executive Editor at Dark Reading,  7/17/2018
The Fundamental Flaw in Security Awareness Programs
Ira Winkler, CISSP, President, Secure Mentem,  7/19/2018
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
Flash Poll
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2018-14492
PUBLISHED: 2018-07-21
Tenda AC7 through V15.03.06.44_CN, AC9 through V15.03.05.19(6318)_CN, and AC10 through V15.03.06.23_CN devices have a Stack-based Buffer Overflow via a long limitSpeed or limitSpeedup parameter to an unspecified /goform URI.
CVE-2018-3770
PUBLISHED: 2018-07-20
A path traversal exists in markdown-pdf version <9.0.0 that allows a user to insert a malicious html code that can result in reading the local files.
CVE-2018-3771
PUBLISHED: 2018-07-20
An XSS in statics-server <= 0.0.9 can be used via injected iframe in the filename when statics-server displays directory index in the browser.
CVE-2018-5065
PUBLISHED: 2018-07-20
Adobe Acrobat and Reader 2018.011.20040 and earlier, 2017.011.30080 and earlier, and 2015.006.30418 and earlier versions have a Use-after-free vulnerability. Successful exploitation could lead to arbitrary code execution in the context of the current user.
CVE-2018-5066
PUBLISHED: 2018-07-20
Adobe Acrobat and Reader 2018.011.20040 and earlier, 2017.011.30080 and earlier, and 2015.006.30418 and earlier versions have an Out-of-bounds read vulnerability. Successful exploitation could lead to information disclosure.