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

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66
votes
7answers
21k 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
23k 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
2k 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
10k 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 ...
12
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 ...
9
votes
4answers
16k 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
501 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 ...
8
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 ...
8
votes
1answer
471 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? ...
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
525 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
1answer
15k 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
3answers
993 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
351 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 ...
5
votes
1answer
588 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 ...
5
votes
1answer
331 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
5k 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 ...
4
votes
0answers
49 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 ...
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
116 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 ...
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
291 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
762 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
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
157 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
510 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
81 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
78 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
87 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
158 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
17k 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
349 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
158 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
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
83 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
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
1answer
76 views

(Theoretically) intercepting GCHQ's smartphone exploit

In the lastest Snowden interview, it was revealed that GCHQ used an exploit sent via SMS to gain access to smartphones, and that this 'exploit' goes unnoticed to the handset user. I was wondering if ...
1
vote
2answers
174 views

Is it safe to rely on text messages as a means on authentication?

Many websites, including banks, use text messages as their primary or secondary means of authentication. In theory, it sounds like a perfect method unless the user loses their phone or has it infected ...
1
vote
2answers
119 views

Is it safe to use Google Authenticator app and SMS instead of passwords

I currently want to start web development where I will be making a login system and want an alternative to storing passwords. The question is: is it safe to use the Google Authenticator app as the ...
1
vote
1answer
108 views

verify an api call is made from the mobile device [duplicate]

I am developing a webserver and provide an API to be used by mobile clients. Some of my calls are without any authorization, for example, to start the authentication process. Is there a good way/best ...
1
vote
1answer
71 views

Google account 2FA only with HW security key?

Is it possible to configure 2FA access to a Google account using only HW security key (e.g. Yubikey) without verification SMS code option ? It seems that SMS confirmation code is still primary 2FA ...
1
vote
1answer
74 views

Encode URL in link that will appear on page in plain text?

I need to send a user a link via SMS that when clicked, and then when some demographic info is verified, will allow them to sign up for my service (which is a healthcare portal, so HIPAA/PCI/PII etc). ...
1
vote
3answers
91 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 ...
1
vote
1answer
209 views

What makes an SMS gateway insecure?

Is it specifically something about SMS protocol, the proprietary software used to do message routing, or perhaps an ACL on the server? I would imagine that a gateway accepting emails from anywhere ...
1
vote
0answers
58 views

How can one tell is a message is spoofed from one phone to another but “about” a third party? [closed]

This question is about whether the source phone number of an SMS message can be spoofed and, if so, what forensic measures might be taken to determine and prove that that has occurred. Assume that a ...