Short message (or messaging) service, a system that enables cellular phone users to send and receive text messages.

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69
votes
7answers
24k views

How hard is it to intercept SMS (two-factor authentication)?

A lot of two-factor authentication mechanisms use SMS to deliver single-use passphrase to the user. So how secure is it? Is it hard to intercept the SMS message containing the passphrase? Do mobile ...
36
votes
6answers
25k views

What is preventing us from sniffing the mobile phone communication?

I'm learning wireless penetration testing. It really is amazing. But it made me wonder, what about mobile phones? They are also means of wireless communication. So, our entire voice must be in the air ...
28
votes
1answer
3k views

How does a new SMS message overwrite a previous one?

During a talk from a vendor, the speaker mentioned that their product used a "little known feature" of SMS in order to overwrite the last text message received from them. This feature was being used ...
19
votes
3answers
2k views

Could my bank's two-factor authentication be hacked?

When I attempt to log in to my bank, an SMS code is sent to my phone. I then type this nine-character code into the bank's Web site, to login to my account. Is this vulnerable to attack, without ...
18
votes
4answers
11k views

Are SMS,MMS stored on the network service providers' servers?

Are SMS and MMS sent via a mobile phone stored on telecommunication service providers' servers before passing them to the recipient? Does it depend on the country or does every network service ...
13
votes
4answers
2k views

Is it “standard” to SMS passwords?

When I get credentials for a new machine, my company will often send the login id in email, then SMS (or sometimes Skype msg) the password. This is obviously in order to separate the login and ...
12
votes
1answer
2k views

TextSecure protocol

Is anyone aware of an analysis of the TextSecure protocol? https://whispersystems.org/blog/simplifying-otr-deniability/ https://github.com/WhisperSystems/TextSecure/wiki/Protocol It is a ...
10
votes
3answers
160 views

How does SMS spoofing work practically?

I have been researching the web for information on how I can spoof an SMS myself, but I seem to find more on how to detect it, or how to use tools to do it rather on how to do it myself. I have tried ...
9
votes
1answer
485 views

Getting strange texts to an iPhone #PWD123456#00X

My dad is getting strange SMS texts to his iPhone 4 Some examples: #PWD123456#WHL003=2308480298 #PWD123456#WHL004=2398480389 #PWD123456#WHL002 #PWD123456#WHL002 #PWD123456#STATUS? ...
9
votes
4answers
18k views

How can SMS spoofing be detected?

SMS spoofing involves faking the source ID, by replacing it with alphanumeric text. This can be useful for mobile providers, but can lead to security issues such as social engineering. How can we as ...
9
votes
1answer
517 views

Is there a list of phone numbers Facebook uses to send auth tokens?

Up to a few days ago, I always received Facebook auth tokens from numbers +181338477XX, except a few times from +85294985XXX. Problem is that lately I've been receiving codes directly from Italian ...
7
votes
1answer
1k views

If I know a currently working exploit to spoof SMS on a major carrier, what should I do? [closed]

This currently works on all iPhones and one known android phone as of today, a formal complaint has been filed with the carrier and the FCC. I doubt they will do anything about it though since this is ...
7
votes
2answers
1k views

How do I forensically determine whether a mobile phone has been infected with a spy suite?

What is the best way of forensically determining that spyware software has been installed on the phones without making any changes to the phone(s)? I have Blackberry and iPhone 4 phones that are ...
7
votes
4answers
535 views

Should SMS systems warn users of possible spoofing attacks?

The author of this blog post Never trust SMS: iOS text spoofing says that: The sender of an SMS message may provide arbitrary sender information using low level protocol features. Furthermore the ...
7
votes
3answers
134 views

Why do Google 2-factor authentication SMS codes never start with a 0? [closed]

When you use 2-step authentication to log to your Google Account, you can get an SMS on your mobile-phone with a G-123456 style code. I think that I never got a code with a leading zero. Is there a ...
7
votes
2answers
248 views

mobile number authorization strategy using SMS, best pattern and practices

In recent years, mobile number has become an important factor for authentication and hence more and more enterprises employ methods to capture their users' mobile numbers using SMS. In a typical ...
7
votes
1answer
16k views

Is there a sms authentication that works like 10minutemail? [closed]

I remember reading on this site a user recommending 10minutemail.com as a way to register or give email address to non-trusted websites. Is there any similar site for disposable phone number for ...
6
votes
1answer
596 views

How to catch a SMS spammer who is using google voice to spam me

How do I catch a SMS spammer who is using google voice to spam me? I have the google voice number and 2 of their burner emails with gmail. How do I gather enough information to inform the ...
6
votes
3answers
1k views

Why does a spam sms contain a link to an email address?

A colleague of mine just received a (spam) sms with this message: Congratulations! Your mobile have won $1,000,000,00 Pounds with Draw# 294 64/2013. For more info & claims, contact our ...
6
votes
2answers
352 views

Can a SMS recipient charge any arbitrary fee to the sender without approval?

I received an email from a prospective "client" in broken English. We have been going back and forth about services for a while and he wants me to text him. Is it possible for him to charge me some ...
6
votes
5answers
165 views
+50

Secure application data transmission via SMS channel

There are mobile banking applications that use SMS channel to communicate with their server. Some of them offer both internet and sms channels which the customer gets to choose from. While there's ...
5
votes
1answer
93 views

Can I use a satellite phone for 2 factor auth sms and such?

Would 2 factor authentication SMS messages or other kinds of internet security notifications work with satellite phones? E.g. companies like Google, Paypal, Facebook, banking institutions and others ...
5
votes
1answer
333 views

SMS PDU specification and carving techniques?

I'm trying to carve NAND flash raw dumps for SMS:s (for school, digital forensics), following the information on dreamfabric.com, but I'm having some trouble. First of all, the specification isn't ...
5
votes
3answers
2k views

Proof of SIM card possession on iOS devices

I need to proof that a user of my app is in possession of the correct SIM card. On android devices, this is possible by simply sending a challenge within an SMS to the corresponding number (the proof ...
4
votes
4answers
2k views

SMS Authentication: random OTP or a cryptographic one

I'm adding two-factor authentication using SMS to enhance an existing login process. Since I'm not working with physical tokens, I was wondering what is considered the safest: Sending random 8 ...
4
votes
1answer
120 views

Are “Security SMS codes” any safer than plain SMS?

Many banking webapps send this kind of SMS, for their 2FA systems. These messages do not appear in the main "Messages" app, seemingly being destroyed after viewing - at least on iOS. Firstly, are ...
4
votes
1answer
72 views

texting password reset link instead of a code

An increasingly common process for assisting with password resets is the application texting a code/token to the user’s verified mobile phone. We have a client which would like to eliminate the need ...
4
votes
1answer
6k views

SMS Spoofing not available in kali

Has the SMS Spoofing option been removed from the Social Engineering Toolkit ? I run 3.14-kali1-amd64. I get only the options shown below. Tried updating both kali and SET but i still dont get the ...
3
votes
4answers
2k views

Can SMS text messages be used to verify a person's unique identity through a short code system?

We run online contests and want to eradicate cheating (yeah right), or at least mitigate it. I've asked the question regarding user experience here: ...
3
votes
1answer
133 views

Should an administrator be able to turn off TFA for a user

We use Google Authenticator and SMS for two factor authentication. Should we allow the administrators of the site to turn off TFA for users? Google Auth uses SMS as backup option but SMS does not ...
3
votes
1answer
51 views

Security requirements for one time access code/token in the url

I have an application that will send an SMS reminder for user containing a URL to log on. I would like to avoid user typing in username/password and log him in directly. For that I plan to use an ...
3
votes
1answer
344 views

Can sms-only authentication be safe?

many Android mobile applications (e.g., Whatsapp, Telegram), when used for the first time on a device, "authenticate" users by sending them a secret code in a SMS message. The same mechanism is used ...
3
votes
1answer
807 views

Is TextKey SMS 2 factor authentication secure against cell phone cloning?

I came across this website today that implements SMS based authentication that works "opposite" most SMS authentication methods. In typical SMS authentication, the provider sends you an access code ...
3
votes
2answers
2k views

SMS / voice call interception with a fake base station

This answer to a similar topic describes in a detailed way how vulnerable SMS and voice calls are in terms of decryption. In order to do so, an attacker needs to set up a fake base station located ...
3
votes
1answer
51 views

Securing 2 factor data from apps that are co-located on the same device?

Several apps such as GMail, Coinbase, Yahoo and others require the use of the mobile device to gain access to the data within the app. For example Gmail requires TOTP in Google Authenticator ...
3
votes
1answer
173 views

What Information is Exposed When I Send A Message From My Mobile Device

When I send a text message and/or an email, with or without location services turned on, what information is available to the recipient of that message if they know how to read the data behind the ...
2
votes
2answers
985 views

Is it secure to SMS your Credit card info (or other info) to someone else?

I am buying some products and have mostly communicated with the store via email. I am planning on paying by credit card, but the store doesn't have online billing. Normally, I would just phone the ...
2
votes
1answer
110 views

Capturing text messages on the fly

Suppose your phone is not connected to any network. You are sitting in a cafeteria with 50 other people, everyone is communicating to each other via text messages. Is it possible through any device or ...
2
votes
2answers
89 views

Secure alerting for a monitored web application

What is a good method to receive security alerts? Email is the first thing that springs to mind, although it is susceptible to MITM attacks (e.g. an attacker preventing the email from being ...
2
votes
2answers
96 views

How can Authenticity be achieved in SMS or Text Messaging?

What tools or information is needed to verify the authenticity of a SMS message... or to send one so that such authenticity is intact? This answer describes something as a "message center", but I'm ...
2
votes
4answers
166 views

Suspicious SMS getting received on selected browsing

I am receiving several suspicious SMS messages with links telling me that I have requested subscription to their services (which I have not) asking me to confirm subscription. These SMS appear only ...
2
votes
2answers
21k views

Trace source and destination of an SMS message [closed]

Is it possible to trace the source or destination (location, even coordinates) of an SMS message ? If it is, is it possible to do it even if the phone is roaming in a different country ?
2
votes
2answers
374 views

Does Google 2-step verification protect user from session hijacking?

After signing in Google 2-Step verification scenario, user should enter verification code which sends to his mobile. Without it, he couldn't access to Gmail account. Consider an attacker does session ...
2
votes
1answer
173 views

Send credentials by sms [duplicate]

If a user forgets his login credentials for a web site, is it secure enough to send users credentials by sms?
2
votes
3answers
121 views

Could a spoken (TTS) SMS-based 2FA be intercepted?

In mid-June, Lastpass made news again, and I've since been mowing around the idea of two-factor authentication. After familiarizing myself with SMS and Google Authenticator, I thought the SMS was a ...
2
votes
2answers
2k views

Retreive header from SMS iphone

I received a lot of SMS from a guy where the phone number change every time. I can answer to these SMS, so I think it's only a spoofing of the sender ID of the SMS header which will be displayed in ...
1
vote
2answers
122 views

Is this spam SMS containing an audio file dangerous?

Yesterday I received a group text message from a number I don't know and opened it by mistake. I was in a group chat with two other people, one in Pennsylvania one in Massachusetts. The message body ...
1
vote
1answer
183 views

How to protect against the new malware Mazar Bot?

Mazar Bot is new Android malware that spreads via SMS. Its capabilities: It can read incoming SMS and send itself, make calls to directory contacts, contaminate Chrome, access to the Network, read the ...
1
vote
2answers
2k views

Could “receive SMS online” site be a scam?

There is a site that allows you to see all SMS received by a certain set of phone numbers (owned by the site). This seems to be meant for services that require two-factor authentication using SMS, ...
1
vote
2answers
126 views

How to deal with SMS spam? [closed]

Every few weeks, I get an annoying SMS trying to sell me something, or trying to get me to click something, or otherwise spamming me. I don't think it's a targeted thing- I think my phone number is ...