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Facebook CSRF Leads bug para aquisições Conta com um único clique

Você acreditaria se disséssemos que clicar em um único link malicioso poderia invadir sua conta do Facebook? O cenário é inteiramente possível devido a uma falsificação de solicitação entre sites crítica recentemente descoberta (CSRF) vulnerabilidade. The flaw could allow attackers to hijack accounts by merely luring targeted users into clicking on the specially crafted URL.




New CSRF Vulnerability in Facebook

The vulnerability was discovered by a researcher known online as Samm0uda. Pelo visto, he noticed a flawed endpoint that could have been compromised to bypass CSRF protections leading to account takeovers.

De acordo com researcher’s report and demonstration:

The vulnerable endpoint is https://www.facebook.com/comet/dialog_DONOTUSE/?url=XXXX where XXXX is the endpoint with parameters where the POST request is going to be made (the CSRF token fb_dtsg is added automatically to the request body).

This allowed him to make many actions, in case the victim visited a maliciously crafted URL for the purpose.
For the account takeover to successfully take place, a new email address or phone number has to be added to the victim’s account.

The issue here is that the victim has to visit two separate URLsone to add the email/phone number, and one to confirm it because the “normal” endpoints used to add emails or phone numbers don’t have a “next” parameter to redirect the user after a successful request, o pesquisador escreveu.

relacionado: [wplinkpreview url =”https://sensorstechforum.com/facebook-bug-unblocks-blocked-individuals/”]Facebook Bug desbloqueado seus bloqueados amigos por uma semana

To bypass this obstacle, the researcher had to find endpoints where the “next” parameter was present so that the account takeover happens with a single URL.

It should be noted that once access to the user’s authentication tokens is obtained, an attacker-controlled email address is added to the account. This further enables attackers to take over accounts by simply resetting passwords and locking the user out of his/her account.

Contudo, the vulnerability presented by the researcher presents a complete one-click exploit that enables attacker to easily hijack accounts. Contudo, this can be avoided with the help of two-factor authentication added to the Facebook account. 2FA would prevent a threat actor from logging into victims’ accounts, unless attackers are able to verify the 6-digit passcode which is sent to the user’s mobile device.

relacionado: [wplinkpreview url =”https://sensorstechforum.com/previously-patched-facebook-remote-code-execution-bug-deemed-exploitable/”]Bug de execução remota de código do Facebook anteriormente corrigido considerado explorável

It should be noted that attackers may still be able to exploit the vulnerability and perform various malicious actions such as changing the user’s profile picture or posting on their timeline.

The vulnerability has been reported to Facebook on January 26, and was addressed on January 31. The Samm0uda researcher got $25,000 as a reward via Facebook’s bug bounty program.

Facebook has squandered [wplinkpreview url =”https://sensorstechforum.com/4-3-million-paid-out-by-facebooks-bug-bounty-program/”]aproximadamente $4.3 milhões em mais de 2,400 relatório de erros, enviado por 800 researchers in the years 2011-2016. Most of the vulnerabilities reported through the program in this program were XSS (cross-site scripting) insetos, CSRF bugs (such as the one described in the article), and Business logic flaws.

Milena Dimitrova

Milena Dimitrova

Um escritor inspirado e gerente de conteúdo que está com SensorsTechForum desde o início do projeto. Um profissional com 10+ anos de experiência na criação de conteúdo envolvente. Focada na privacidade do usuário e desenvolvimento de malware, ela acredita fortemente em um mundo onde a segurança cibernética desempenha um papel central. Se o senso comum não faz sentido, ela vai estar lá para tomar notas. Essas notas podem mais tarde se transformar em artigos! Siga Milena @Milenyim

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