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mpaign against selected apple users who were flooded with system level password reset requests the attackers appeared to be sending the requests through apple s iforgot password reset page the volume of requests raised the possibility of a rate limiting flaw in that system 53 token reuse edit token reuse vulnerabilities are an identification and authentication failure in web applications 54 token reuse can be identified by testing reuse of old mfa tokens indicating whether or not the application is invalidating mfa codes any auth token given prior to mfa should not have permission to access sensitive resources auth tokens should only be provided after mfa verification old tokens should be invalidated 55 email verification mfa bypasses edit many web applications bypass authentication when verifying an email address if the web application does not invalidate the email verification link the verification link may be usable to bypass the mfa 56 if the verification token is sent via get request it may be saved in the browser s history 57 insufficient rate limiting edit mfa requires rate limiting to be secure without rate limiting an attacker can preform an arbitrary number of auth requests attempting different codes until they eventually get access 58 even with a rate limit attackers may try to limit the flow rate of requests to just under the limit threshold with a single thread to maximize the rate of attempts 59 alternatively an attacker may try to bypass the rate limit all together if the rate limit is tied to a session id or request token the attacker may generate new sessions or request tokens to reset the limit if tied to ip the attacker may rotate their ip with a tool such as burp suite s ip rotator 60 implementation edit many multi factor authentication products require users to deploy client software to make multi factor authentication systems work some vendors have created separate installation packages for network login web access credentials and vpn connection credentials for such products there may be four or five different software packages to push down to the client pc in order to make use of the token or smart card this translates to four or five packages on which version control has to be performed and four or five packages to check for conflicts with business applications if access can be operated using web pages it is possible to limit the overheads outlined above to a single application with other multi factor authentication technology such as hardware token products no software must be installed by end users citation needed some studies have shown that poorly implemented mfa recovery procedures can introduce new vulnerabilities that attackers may exploit 61 there are drawbacks to multi factor authentication that are keeping many approaches from becoming widespread some users have difficulty keeping track of a hardware token or usb plug many users do not have the technical skills needed to install a client side software certificate by themselves generally multi factor solutions require additional investment for implementation and costs for maintenance most hardware token based systems are proprietary and some vendors charge an annual fee per user deployment of hardware tokens is logistically challenging hardware tokens may get damaged or lost and issuance of tokens in large industries such as banking or even within large enterprises needs to be managed in addition to deployment costs multi factor authentication often carries significant additional support costs citation needed a 2008 survey 62 of over 120 u s credit unions by the credit union journal reported on the support costs associated with two factor authentication in their report software certificates and software toolbar approaches clarification needed were reported to have the highest support costs research into deployments of multi factor authentication schemes 63 has shown that one of the elements that tend to impact the adoption of such systems is the line of business of the organization that deploys the multi factor authentication system examples cited include the u s government which employs an elaborate system of physical tokens which themselves are backed by robust public key infrastructure as well as private banks which tend to prefer multi factor authentication schemes for their customers that involve more accessible less expensive means of identity verification such as an app installed onto a customer owned smartphone despite the variations that exist among available systems that organizations may have to choose from once a multi factor authentication system is deployed within an organization it tends to remain in place as users invariably acclimate to the presence and use of the system and embrace it over time as a normalized element of their daily process of interaction with their relevant information system while the perception is that multi factor authentication is within the realm of perfect security roger grimes writes 64 that if not properly implemented and configured multi factor authentication can in fact be easily defeated history edit a self contained rsa securid model in 2013 kim dotcom claimed to have invented two factor authentication in a 2000 patent 65 and briefly threatened to sue all the major web services however the european patent office revoked his patent 66 in light of an earlier 1998 u s patent held by at t 67 see also edit authentication factors electronic authentication identity management multi party authorization mutual authentication out of band reliance authentication universal 2nd factor identity threat detection and response references edit what is multifactor authentication microsoft support support microsoft com retrieved 2026 08 14 russell steve 2023 02 22 bypassing multi factor authentication itnow 65 1 42 45 doi 10 1093 combul bwad023 issn 1746 5702 meyer l a romero s bertoli g burt t weinert a ferres j l 2023 how effective is multifactor authentication at deterring cyberattacks arxiv 2305 00945 cs cr 1 2 3 two factor authentication what you need to know faq cnet cnet archived from the original on 2020 02 12 retrieved 2015 10 31 1 2 3 jacomme charlie kremer steve february 1 2021 an extensive formal analysis of multi factor authentication protocols acm transactions on privacy and security 24 2 new york city association for computing machinery 1 34 doi 10 1145 3440712 issn 2471 2566 s2cid 231791299 archived from the original on august 3 2023 retrieved february 27 2021 kaitlin boeckl nist gov 2016 06 28 back to basics multi factor authentication mfa nist archived from the original on 2021 04 06 retrieved 2021 04 06 barrett brian july 22 2018 how to secure your accounts with better two factor authentication wired archived from the original on 7 september 2020 retrieved 12 september 2020 configuring one time passwords www sonicwall com sonic wall archived from the original on 19 january 2022 retrieved 19 january 2022 1 2 van tilborg henk c a jajodia sushil eds 2011 encyclopedia of cryptography and security volume 1 berlin germany springer science business media p 1305 isbn 9781441959058 boeyen sharon santesson stefan polk tim housley russ farrell stephen cooper david may 2008 internet x 509 public key infrastructure certificate and certificate revocation list crl profile report internet engineering task force cao liling ge wancheng 2015 03 10 analysis and improvement of a multi factor biometric authentication scheme analysis and improvement of a mfba scheme security and communication networks 8 4 617 625 doi 10 1002 sec 1010 archived from the original on 2022 11 25 retrieved 2022 03 20 11 tips for protecting active directory while working from home www darkreading com archived from the original on 2024 08 29 retrieved 2024 08 29 does kim dotcom have original two factor login patent the guardian 2013 05 23 archived from the original on 2022 11 02 retrieved 2022 11 02 ep 0745961 transaction authorization and alert system issued 1996 12 04 wang ding he debiao wang ping chu chao hsien 2014 anonymous two factor authentication in distributed systems certain goals are beyond attainment pdf ieee transactions on dependable and secure computing piscataway new jersey institute of electrical and electronics engineers archived pdf from the original on 2017 05 17 retrieved 2018 03 23 andy greenberg 2016 06 26 so hey you should stop using texts for two factor authentication wired archived from the original on 2018 05 13 retrieved 2018 05 12 nist is no longer recommending two factor authentication using sms schneier on security august 3 2016 archived from the original on december 1 2017 retrieved november 30 2017 rollback the united states nist no longer recommends deprecating sms for 2fa july 6 2017 archived from the original on july 2 2019 retrieved may 21 2019 duo security features internet archive archived from the original on 28 june 2011 retrieved 28 jun 2011 tung liam google prompt you can now just tap yes or no on ios android to approve gmail sign in zd net archived from the original on 31 august 2017 retrieved 11 september 2017 chance miller 2017 02 25 apple prompting ios 10 3 9to5 mac archived from the original on 2017 09 11 retrieved 11 september 2017 how russia works on intercepting messaging apps bellingcat bellingcat 2016 04 30 archived from the original on 2016 04 30 retrieved 2016 04 30 kan michael 7 march 2019 google phishing attacks that can beat two factor are on the rise pc mag archived from the original on 8 march 2019 retrieved 9 september 2019 ss7 security vulnerabilities the complete guide to attacks and prevention terrazone 6 december 2025 retrieved 2026 06 08 nichols shaun 10 july 2017 two factor fail chap gets pwned after at t falls for hacker tricks the register archived from the original on 2017 07 11 retrieved 2017 07 11 toorani mohsen beheshti a 2008 ssms a secure sms messaging protocol for the m payment systems 2008 ieee symposium on computers and communications pp 700 705 arxiv 1002 3171 doi 10 1109 iscc 2008 4625610 isbn 978 1 4244 2702 4 s2cid 5066992 official pci security standards council site verify pci compliance download data security and credit card security standards www pcisecuritystandards org archived from the original on 2021 12 27 retrieved 2016 07 25 commission delegated regulation eu 2018 389 of 27 november 2017 supplementing directive eu 2015 2366 of the european parliament and of the council with regard to regulatory technical standards for strong customer authentication and common and secure open standards of communication text with eea relevance 2018 03 13 retrieved 2021 04 06 karnik madhura 7 december 2016 finally indians can use credit cards online without painful otps but only for purchases under rs2 000 quartz archived from the original on 10 december 2023 retrieved 10 december 2023 agarwal surabhi 7 december 2016 payment firms applaud rbi s move to waive off two factor authentication for small value transactions the economic times archived from the original on 14 september 2020 retrieved 28 june 2020 nair vishwanath 6 december 2016 rbi eases two factor authentication for online card transactions up to rs2 000 livemint archived from the original on 28 june 2020 retrieved 28 june 2020 uber now complies with india s two factor authentication requirement calls it unnecessary and burdensome venturebeat 2014 11 30 archived from the original on 2021 09 05 retrieved 2021 09 05 homeland security presidential directive 12 department of homeland security august 1 2008 archived from the original on september 16 2012 sans institute critical control 10 secure configurations for network devices such as firewalls routers and switches archived from the original on 2013 01 28 retrieved 2013 02 11 sans institute critical control 12 controlled use of administrative privileges archived from the original on 2013 01 28 retrieved 2013 02 11 digital identity guidelines nist special publication 800 63 3 nist june 22 2017 archived from the original on november 21 2017 retrieved february 2 2018 ffiec press release 2005 10 12 archived from the original on 2011 06 02 retrieved 2011 05 13 frequently asked questions on ffiec guidance on authentication in an internet banking environment pdf ffiec 2006 08 15 archived pdf from the original on 2012 11 15 brian krebs july 10 2006 security fix citibank phish spoofs 2 factor authentication washington post archived from the original on july 3 2011 retrieved 20 september 2016 shankland stephen two factor authentication not as secure as you d expect when logging into email or your bank cnet archived from the original on 2020 09 27 retrieved 2020 09 27 bruce schneier march 2005 the failure of two factor authentication schneier on security archived from the original on 20 december 2016 retrieved 20 september 2016 alex perekalin may 2018 why you shouldn t ever send verification codes to anyone kaspersky archived from the original on 20 october 2020 retrieved 17 october 2020 siadati hossein nguyen toan gupta payas jakobsson markus memon nasir 2017 mind your smses mitigating social engineering in second factor authentication computers security 65 14 28 doi 10 1016 j cose 2016 09 009 s2cid 10821943 khandelwal swati real world ss7 attack hackers are stealing money from bank accounts the hacker news archived from the original on 2017 05 06 retrieved 2017 05 05 mfa fatigue hackers new favorite tactic in high profile breaches bleepingcomputer archived from the original on 2023 06 27 retrieved 2023 08 12 1 2 mfa fatigue hackers new favorite tactic in high profile breaches bleepingcomputer archived from the original on 2023 06 27 retrieved 2023 01 26 burt jeff 3 november 2022 multi factor authentication fatigue can blow open security www theregister com archived from the original on 2023 01 26 retrieved 2023 01 26 constantin lucian 2022 09 22 multi factor authentication fatigue attacks are on the rise how to defend against them cso online archived from the original on 2023 01 26 retrieved 2023 01 26 tung liam microsoft authenticator gains feature to thwart spam attacks on mfa zdnet archived from the original on 2023 01 26 retrieved 2023 01 26 1 2 implementing number matching in mfa applications pdf report cybersecurity and infrastructure security agency october 2022 retrieved 2026 10 18 whittaker zack 2022 09 19 how do you stop another uber hack techcrunch archived from the original on 2023 08 24 retrieved 2023 08 24 hardcastle jessica lyons 2022 09 19 uber explains how it was pwned this month points finger at lapsus gang the register archived from the original on 2023 08 24 retrieved 2023 08 24 vigliarolo brandon 2024 03 27 apple fans deluged with phony password reset requests www theregister com retrieved 2026 10 19 a07 identification and authentication failures owasp top 10 2021 top10 owasp org retrieved 2026 09 22 2fa mfa otp bypass hacktricks retrieved 2026 09 22 rahul s 2023 07 22 behind the scenes of a security bug the perils of 2fa cookie generation ...
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