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50 votes
Accepted

Why is the issuer certificate different at my workplace and at home?

Yes, a company doing SSL interception could in theory read all your traffic if you use the company network. Depending on where you live and what kind of contract you have the ability for the company ...
Steffen Ullrich's user avatar
40 votes
Accepted

SSL issue captures Facebook app send out traffic

Facebook uses Certificate Pinning which prevents attacks like yours. What Is Pinning? Pinning is the process of associating a host with their expected X509 certificate or public key. Once a ...
mentallurg's user avatar
  • 12.5k
39 votes

As a contractor how do I work on multiple client networks without data leakage?

You could use a very small VM for each one, but keep the IDE on the host, not on the guests. Share a folder from the VM to the host, so you use the host and its resources to develop, and use the VM ...
ThoriumBR's user avatar
  • 54.6k
32 votes
Accepted

Can a VPN Provider MitM my SSL traffic without me noticing?

How does the provider forward the traffic without exposing my IP, but also without breaking the SSL. SSL is protection (like encryption) on top of TCP which sits on top of IP. The underlying layers (...
Steffen Ullrich's user avatar
23 votes
Accepted

My school wifi asks to 'trust' a certificate on iPhones. Does this allow them to view SSL traffic?

It's ok. The certificate you installed and trusted is used to provide you secure authentication against their RADIUS server and prevent you from connecting to rogue RADIUS server. If someone decides ...
Crypt32's user avatar
  • 6,401
17 votes
Accepted

Hide clear SNI when using https

It is not possible to hide the SNI information if the server requires it to serve the proper certificate. There was discussion on encrypting this information in TLS 1.3. But this idea was abandoned ...
Steffen Ullrich's user avatar
16 votes

As a contractor how do I work on multiple client networks without data leakage?

If you use a operating system that has support for separate networking namespaces, use that feature to start each VPN client and all applications in a distinct client-namespace. There are a lot of ...
Josef's user avatar
  • 5,993
14 votes
Accepted

If a WAF is compromised, can the adversary view all the traffic in clear text provided WAF uses SSL cert to decrypt it?

Yes, the configuration is as follows: [client web browser] <--TLS--> [WAF] <--TLS--> [origin web server] So, the WAF essentially has a 'man in the middle' (MITM) position between the ...
mti2935's user avatar
  • 23.7k
11 votes
Accepted

How to mitigate credential disclosure in man in the middle attack

The Secure Remote Password (SRP) protocol can be used to send credentials over an unencrypted network. You could also require SSL/TLS client authentication which will prevent the proxy from being ...
Irfan434's user avatar
  • 759
10 votes

Why is the issuer certificate different at my workplace and at home?

In addition to scanning for malware, corporate IT also uses TLS intercept for data loss prevention (DLP), eg. making sure you're not sending proprietary documents through your personal e-mail. In ...
Mark E. Haase's user avatar
10 votes

Can a VPN Provider MitM my SSL traffic without me noticing?

The short answer is: Your VPN provider can do anything your ISP can do if you're not using a VPN. This may include breaking TLS, if your browser trusts a root CA, which issued an intermediate ...
allo's user avatar
  • 3,451
10 votes

How can police get someone's search history?

What are the possible ways they can do that? The main ways police can obtain search records are by: Looking at local browser history on the suspect's computer (as you mentioned). Demanding ...
forest's user avatar
  • 67k
9 votes
Accepted

Can a man in the middle hear half the HTTPS conversation

No. A cryptographic system that only protected half of the information would just be slightly better than useless. During the handshake, a symmetric key is exchanged. After the handshake, that ...
Anders's user avatar
  • 65.7k
9 votes
Accepted

Disable or bypass SSL Pinning/Certificate Pinning on Android 6.0.1

Did you go through these procedures to get JustTrustMe to bypass the cert pinning -- http://www.welivesecurity.com/2016/09/08/avoid-certificate-pinning-latest-versions-android/ -- ? If you are just ...
atdre's user avatar
  • 19.1k
9 votes
Accepted

Can I use CloudFlare if I want to avoid NSA and FISA secret orders?

First of all, just because you use CloudFlare does not mean that the traffic will pass through the US. CloudFlare currently has 102 edges, and requests will be sent to the nearest one. This is what is ...
Anders's user avatar
  • 65.7k
9 votes
Accepted

How to check Google SSL certificate?

Based on your description and the link you've provided you've likely installed a CA certificate for SSL interception. ... how do I know the certificate I have is legit? That is, actually comes ...
Steffen Ullrich's user avatar
9 votes

Can messages be intercepted when in airplane mode?

The way several messaging apps work is the message I send is encrypted when sent to the server, then decrypted, and then sent to the intended client in a decrypted state. I am unaware of any instant ...
nobody's user avatar
  • 11.6k
8 votes
Accepted

Is it acceptable for an employer to install a self-signed root certificate on employees personal devices at home?

This is not a strictly a legal or technical question, but rather an opinion question - "is it acceptable?" Is it acceptable to you? You bring up a perfectly reasonable technical point though - in ...
JesseM's user avatar
  • 1,962
8 votes
Accepted

How can I intercept Android application's SSL traffic where SSL pinning is used?

SSL Pinning is the additional layer of security implemented at the client side to let the mobile application only trust a particular SSL certificate during HTTPs connection establishment and not the ...
Shiv Sahni's user avatar
8 votes
Accepted

Is there no way to bypass certificate pinning without patching apps?

No, there is no way to bypass certificate pinning without application patching or using debugger (tracer). The reason is that, in simple words, certificate pinning is when a CA certificate is ...
Alexander Fadeev's user avatar
7 votes
Accepted

Securing a Web application using HSTS

Being able to intercept SSL traffic with an imported root certificate is not considered a weakness of the web application. It's a browser design decision to allow the import of custom local trust ...
Arminius's user avatar
  • 45k
7 votes

Why is the issuer certificate different at my workplace and at home?

Being able to "read" all your encrypted communication doesn't necessarily mean someone is literally sitting at a computer and looking at your data. The "man in the middle" is generally a firewall or ...
Chris Pratt's user avatar
7 votes

As a contractor how do I work on multiple client networks without data leakage?

Enable split tunneling, so the only traffic that goes across the VPN to Client X is traffic bound for their servers.
Joseph Sible-Reinstate Monica's user avatar
6 votes
Accepted

Is SSL Interception possible without disabling Public Key Pinning on the client side?

In case of legal SSL interception the proxy CA which is used to issue the certificates for the intercepted connections gets explicitly imported into the browser/OS as trusted. In such a case browser ...
Steffen Ullrich's user avatar
6 votes

Is this threat in SSL for real?

Anyone can compromise the DNS request authority chain (true). Not true on a global scale but true inside a network you kind of control. This might be a network with weak security (i.e. typical free ...
Steffen Ullrich's user avatar
6 votes
Accepted

Preventing a Burp and Intercept

You may want to ask the reporter to explain what they think the security implications are. Tricking the browser into showing a successful login via a locally forged API response does no harm unless ...
Arminius's user avatar
  • 45k
6 votes
Accepted

Does SSL inspection break applications utilizing certificate pinning?

Does this mean that these applications cease to function completely on corporate and academic networks that utilize SSL inspection, unless the administrator specifically exempts them Yes,You are ...
yeah_well's user avatar
  • 3,804
6 votes

Mutual TLS and Cert Pinning solving the same problem?

While mutual TLS and certificate pinning are intended for different problems they can be used to solve the specific problem of detecting active MITM too. Only, with mutual TLS it is the server which ...
Steffen Ullrich's user avatar
6 votes

As a contractor how do I work on multiple client networks without data leakage?

If you are on a Linux laptop, I recommend a separate Linux user for each client. Those separate users can each have their own scripts to connect to a network and VPN if necessary. With this method and ...
dotancohen's user avatar
  • 3,736

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