Slashdot Mirror

← Back to Stories (view on slashdot.org)

Australian Telcos Declare SMS Unsafe For Bank Transactions

Posted by timothy on from the txt-me-ok? dept.

littlekorea writes "Australia's telcos have declared that SMS technology should not be used by banks to verify identities for online banking transactions, in a bid to wash their hands of culpability for phone porting hacks. But three of Australia's largest four banks insist they will continue to use SMS messages to carry authentication codes for transactions."

28 of 42 comments (clear)

  1. repeat after me... by bcong · · Score: 1

    something you know, something you have, and something you are

    1. Re:repeat after me... by Anonymous Coward · · Score: 2, Funny

      technology, motivation, stupid

      Ugh, captcha: diploma.

    2. Re:repeat after me... by PPH · · Score: 5, Interesting

      Imagine if your thumb / palm / eye was worth ten million dollars to someone. In this sort of situation, it's better to implement 'somewhere you are', (Especially if that somewhere is somewhere people can look at you and confirm you are you visually.

      Not always just you. Some years ago, the local media interviewed a member of Bill Gates' security team. It seems that Bill travels with minimal security. Meanwhile, his family is heavily protected. When asked why, the guard said, "Bill has to be free to visit the bank to make a withdrawal. We need to make sure his family is safe when he does so."

      --
      Have gnu, will travel.
    3. Re:repeat after me... by dgatwood · · Score: 1, Informative

      something you know, something you have, and something you are

      The problem is that superficially, a phone looks like a great second factor. You know your password, and you have your phone. Unfortunately, in practice, it is not a second factor at all because the phone is a party to the communication of the first factor (password/PIN), so compromising the phone compromises a second factor implicitly. Fundamentally, no phone can ever be a second factor for authentication purposes, period, so long as it is possible to enter your password or PIN through that phone.

      The ability to clone phones is just the icing on the cake. It's the beach ball floating through the gaping hole that nobody noticed previously that calls attention to the flaw in the minds of people who were otherwise not sufficiently security-minded to see it.

      --

      Check out my sci-fi/humor trilogy at PatriotsBooks.

    4. Re:repeat after me... by PrimaryConsult · · Score: 1

      Fundamentally, no phone can ever be a second factor for authentication purposes, period, so long as it is possible to enter your password or PIN through that phone.

      Not at all. If you never enter your bank password or pin through the phone in the first place, there is no way a compromised phone will be able to obtain it. I do all of my online banking from a computer, so a second factor being the phone would work fine (unfortunately only the least important of my three banks uses two factor).

    5. Re:repeat after me... by dgatwood · · Score: 1

      Not at all. If you never enter your bank password or pin through the phone in the first place, there is no way a compromised phone will be able to obtain it. I do all of my online banking from a computer, so a second factor being the phone would work fine (unfortunately only the least important of my three banks uses two factor).

      Fair point. But that kind of negates the purpose of all the mobile banking apps at that point, which the banks are eager to promote because they think it makes them look more in touch with their customers' needs. Besides, you're basically assuming security-conscious users with that assertion. :-)

      Unfortunately, even if we very optimistically estimate the security knowledge of a bank's customers, I doubt that more than 1% would know enough about computer security to understand that a single device cannot safely be used for both purposes. Therefore, it is the banks' responsibility to ensure that it is not possible for them to set up their account in this way. In practice, this probably means that you either have the ability to do banking on the web (and/or with a mobile app) or you allow text messages as a second factor, but not both.

      I mean, sure, they could ostensibly disable the use of text messages as a second factor when you first log in with their mobile banking app or using any mobile device to access their website, but the sheer number of hairy edge cases that would cause means that such a design would get very, very complicated very, very quickly.

      --

      Check out my sci-fi/humor trilogy at PatriotsBooks.

    6. Re:repeat after me... by Anonymous Coward · · Score: 1

      It's the beach ball floating through the gaping hole that nobody noticed previously that calls attention to the flaw in the minds of people who were otherwise not sufficiently security-minded to see it.

      It is no such thing.

      I've worked on a number of Multi Factor Authentication projects at 2 different Australian banks (1 major, 1 minor) and had numerous in-depth conversations with other banks, and we were well aware of these sorts of issues. If anything, I'm more surprised that this (number porting) hasn't happened more often previously. The main obstacle is that is requires doing a targeted attack (at least on the phone side, you can do a scatter-gun approach on the PC side, and then try and get phone details for the owners of the PCs you successfully infect) and most attacks we see are still broad, but shallow.

      I'm even more surprised that we've never detected a combined key-logger + sms interceptor trojan for a major smartphone OS. From the time phone-based internet banking become popular, we always knew that we had a risk there. So far it's not a risk that has eventuated.

      The banks cover the losses of anyone who has money stolen via internet/phone banking (unless they were complicit in the theft). There is clearly still an impact on the customer who has to claim back the money, and live with a shortfall while the claim is investigated and processed, but the actual money being lost is the banks'.

      So the banks have every incentive to reduce these thefts, and hire talented and smart people to help devise solutions, but there are 2 obstacles:

      1. It has to be easy and convenient to use, or the customers won't use it (and will go to another bank if you force them to use it). The article talked about physical device tokens, and every bank has them and uses them, but most customers don't particularly like them, and prefer to use SMS.
      2. It has to be cost-effective. The banks suffer a certain amount in losses. Any proposed solution needs to save more than it costs (including intangible costs/savings such as customer satisfaction).

      Every project I've been involved with has been well aware that the solutions being employed were not perfect. They never had to be perfect, they just had to reduce the bank's exposure, and they do that very well.

      Phone cloning / SIM stealing / number porting requires a co-ordinated, targeted attack. Those are generally not a major concerns for the banks. There are other techniques for detecting them, and the losses are relatively small. The number of attacks that use un-targeted or weakly-targeted trojans still greatly exceeds those sort of targeted attacks, and so that's where the banks still focus their efforts. SMS multi-factor-authentication is still a strong mitigator of those risks (although a smartphone trojan could rip it to shreds).

    7. Re:repeat after me... by marcosdumay · · Score: 1

      It's still dificult to understand.

      The paper table of codes that is used by some banks is way safer, more reliable, and somewhat cheaper than the SMS code. Also, it is about as much easy to use as the SMS code. Yet, lots of banks prefer SMS.

      I blame MBAs for that.

      --
      Rethinking email
  2. First Post by PPH · · Score: 1

    Sent from someone else's phone.

    --
    Have gnu, will travel.
  3. Not surprised... by u.hertlein · · Score: 2

    I'm not at all surprised that the banks here don't follow that advice.
    Westpac seems to think that a six digit password (upper-case characters and digits only) is enough for online banking. :-(

    --
    Geek by Nature - Linux by Choice.
    1. Re:Not surprised... by Krojack · · Score: 2

      My bank seems to think using your debit card number and pin are enough.

    2. Re:Not surprised... by norpy · · Score: 4, Informative

      They also seem to think that inputting your password with an on-screen html keyboard using your mouse will provide *ANY* extra security.

      The one thing that i'm happy about is that unlike commonwealth bank, they are not integrating facebook with their online banking system.
      Just let that one sink in a little bit.... integrating FaceBook with your online banking

    3. Re:Not surprised... by Anonymous Coward · · Score: 1

      I once used a credit union where they used an on-screen keyboard that moved a little bit in a random direction each time you clicked on it. I imagine using the mouse would prevent keyloggers from getting your password, and the random movement would prevent logging of the position of the cursor when clicking from being useful.

  4. Re:This Just In.... by fuzzyfuzzyfungus · · Score: 2

    From the department of No Shit Sherlock!

    For those that were not previously aware, banking via email or smartphone is begging to have your account emptied.

    Architecturally, 'smartphone' is pretty much identical to 'pc', possibly more secure in practice. If a phone is 'smart' in any serious sense, it will support the same HTTP+SSL arrangement that you'd use on a computer. SMS, on the other hand, combines the very finest weaknesses of email with those of a direct connection to your local malevolent telco's billing infrastructure...

  5. These banks require customers to have cellphones? by John+Hasler · · Score: 1

    n/t

    --
    Warning: this article may contain humor, sarcasm, parody, and perhaps even irony. Read at your own risk.
  6. OpenPGP + SMS perhaps? by mlts · · Score: 3, Insightful

    It would be nice if one could add a standardized encryption/signing layer on top of MMS (or SMS if one stitched together multiple messages.) That way, an app from the bank could look at incoming messages, verify they were genuine (regardless of what the phone number states), decrypt them with the user's key, and pass the authentication info to the user.

    Fake SMS attempts would be detected/ignored, and an attacker able to get access to text messages wouldn't have the ability to decode them unless they also had access to the phone and the app's private key (which would be unique and generated on each device.)

  7. Re:This Just In.... by Anonymous Coward · · Score: 1

    pretty much, possibly, if...

    Unfortunately, unlike a PC based browser where we can verify that our channel to the site is encrypted end-to-end, verify the certificate etc, with a smartphone app we can do none of that. With a smartphone app all we can do is hope that they properly used TLS to encrypt our communication and that the app doesn't leak our information to other apps or third party advertisers. We can only hope that our account details are not stored in a local text or log file. We, perhaps foolishly, assume that major bank corp wouldn't be so stupid as to not properly implement a TLS session before connecting us to our online banking and yet, there's no way to tell without sniffing the traffic.

  8. Re:Use The Right Tool by Krojack · · Score: 2

    It should be a federal offence to use "symantec" and "security" in the same paragraph..

    Oh guess that would mean I'm going to jail... WOOO free roof over my head with free food!

  9. Re:These banks require customers to have cellphone by mlts · · Score: 2

    The best answer to this was IBM's ZTIC. The ZTIC is a simple device, and the KISS principle is important when it comes to security.

    You plug it in to a USB port, it authenticates and has a direct secure channel to the bank regardless how compromised the computer it is plugged to might be.

    Then, when you do a bank transaction, the ZTIC will pop up a display confirming the transaction, the parties involved, the direction, the time, and the amount. A transfer of a complete bank account to Nigeria is fairly obvious unless someone just blindly hits the "approve" button like the guy on the Drivetime commercial.

    The worst malware can do is cut the path between the ZTIC and the bank's computers which means the transaction doesn't get confirmed and thus doesn't happen.

  10. Someone transferred her number and she didnt notic by citizenr · · Score: 1

    Someone transferred her number and she didnt notice? And she runs a business?
    Not getting any calls wasnt a clue enough?

    --
    Who logs in to gdm? Not I, said the duck.
  11. They just want to stop number porting by SpazmodeusG · · Score: 5, Insightful

    Secure Computing and iTnews.com.au have led a campaign to convince Australia's telcos to include extra security questions during the mobile phone number porting process to ensure fraudsters can't take control of a victim's phone number to gain access to SMS verification codes.

    Let me guess. Secure Computing and iTnews.com.au work closely with Telstra and Optus right?

    Here in Australia, thanks to consumer protection legislation changing mobile providers is a breeze. You ring up the provider you wish to change to and you ask to be ported. They send you an SMS and ask your personal details and old providers account number and then switch you over. It's both secure and easy (they need your phone number, old provider details and personal details to switch you over). You're now with another provider. You don't need to cancel with your old provider, they do that for you. Your number stays the same. The two biggest Telcos (Telstra and Optus) hate it as there's no lock in. They have to compete on price and service.

    So Telstra and Optus lobby hard to ban number porting. They make up bullshit such as "OMG allowing people to switch phone providers is dangerous!!!!". They get their friends in the media to chant the same thing. "Ban number porting!!!"

    The reality is that the banks don't use SMS confirmations for anything more than a 3rd layer of security. They don't ask you to transmit anything over the SMS service, it's simply used by them to send you message that a transaction is taking place along with a key that you have to type into online banking (after logging in securly) to allow that transaction to proceed. Essentially it's traditional "login over https" style banking with an extra layer of SMS notifications when you do transactions. It doesn't need the SMS security itself to be bomb-proof as that's just the last step.

    So all this talk of restricting number porting is ridiculous. Good on the Communications Alliance (who are mostly made up of smaller Telcos that like number porting) for not bowing to the pressure and bullshit spouted by here by iTnews.com.au. It really isn't an issue, in fact i think other countries should adopt similar consumer protection laws where switching providers whilst retaining the old mobile number is a breeze.

    1. Re:They just want to stop number porting by PCM2 · · Score: 1

      So all this talk of restricting number porting is ridiculous. Good on the Communications Alliance (who are mostly made up of smaller Telcos that like number porting) for not bowing to the pressure and bullshit spouted by here by iTnews.com.au. It really isn't an issue, in fact i think other countries should adopt similar consumer protection laws where switching providers whilst retaining the old mobile number is a breeze.

      I don't know if switching mobile providers and keeping the same number is "a breeze" in the US, but I've done it a few times. You can even switch from a landline to a mobile phone and keep your same number, in many cases. There are no fees involved, unless you break a contract.

      That said, there definitely is something fishy about this story. Do a Google search for "mobile phone porting fraud" and most of the results you get back are from .au domains. I don't know if that points to a misguided media (or marketing) campaign, like you suggest, or maybe there's a weakness in the number porting procedure in Australia that doesn't exist in other countries?

      --
      Breakfast served all day!
  12. Social Engineering by kamikaze_late2party · · Score: 1

    This seems more a case of social engineering than exploiting the lack of SMS security.

    The main Issue as I see it is that Vodafone ported over the number to a new phone, while talking to an unverified person. They may have verified him, but only with some weak details that were publicly available.

    /. always reaches for the tech solution first.

    Obligatory - http://xkcd.com/538/

  13. Re:Someone transferred her number and she didnt no by SpazmodeusG · · Score: 3, Insightful

    Hell not just that. SMS is one small step of internet banking. You still need the banks userID and password to log into online banking before you even make use of the SMS transaction confirmations. There's also a lot of requirements for number porting as it is too - accountID and details with the old provider and there's SMS notices sent when the porting is attempted too.

    So this woman was socially engineered out of the following - Her real name, address and DOB (fair enough, this is publically available), her old mobile providers details and accountID (someone go through her bin?), her banks clientID and password (she fall for a fake bank email?), she didn't notice the SMS announcements that she'd be ported to a new provider next month (wtf?) and finally she didn't notice a lack of calls coming in.

    At some point you have to say fuck it, there's no way to protect people like this. Even if it was made more difficult to port numbers she's clearly stupid enough to give away any and all information asked of her.

  14. Re:These banks require customers to have cellphone by mlts · · Score: 1

    I wish I knew... I assume that it would be Linux friendly.

    What would be an ideal is a ZTIC-like device as one offering, but if it requires a driver, perhaps an for a smartphone that uses OpenPGP packets over MMS might be passable. Since the app would use the phone's IP stack to communicate, it would be fairly secure, barring a compromise of the device.

    Plus, since the app is only communicating with the bank, it could have the fingerprints of any public keys built in, so a compromised CA would have zero effect on the communications channel.

  15. I guess it takes longer... by mschaffer · · Score: 1

    I guess it takes longer for some obvious things to sink in down under. SMS insecure? Never heard that before. (ROFL)

  16. Re:Not suprising by PrimaryConsult · · Score: 1

    How about mandating exactly 6 characters and requiring a number and special character?
    I wish there was some place to report piss poor password schemes for banks (BBB?), no amount of my complaining has done it, not even informing them that they are strictly my "just enough to use the ATM every week" bank, and my real money is elsewhere...

  17. Re:These banks require customers to have cellphone by mjwx · · Score: 1

    No, You have the option of using a mobile telephone (no, like the rest of the world we dont call them "cell" phones) or can opt for the other method (either a one time pad or RSA token depending on the bank).

    --
    Calling someone a "hater" only means you can not rationally rebut their argument.