Medium severity

Gmail vulnerable to automated password cracking

Automated password-guessing attack on Gmail using the "Check email using POP3" feature.

Original release date
July 2009
Discovered by
Vicente Aguilera Díaz
Severity
4.5 / 10 CVSS v2.0
Affected product
Google's Gmail service

Antecedentes

Gmail is Google's free web-based email service, with built-in search technology and ample storage capacity for keeping messages, files, and images.

Description

An abuse of functionality in the "Check mail using POP3" capability allows automated attacks against Gmail account passwords, bypassing Google's security measures. Gmail implements many security controls (CAPTCHA, temporary IP or account blocking in the event of unusual activity), but this feature allows them to be bypassed.

Business impact

Unlimited capacity for guessing Gmail account passwords and selectively denying service to users (password reset).

Affected systems

Gmail service.

Solución

Implement stronger, more consistent controls against password guessing. The manufacturer has not adopted any solution, so using strong passwords is recommended.

Calendario de divulgación

Jul 5, 2009 Vulnerability discovered by Internet Security Auditors.
13 Jul 2009 Contact the Gmail security team.
Jul 15, 2009 Request for confirmation of receipt and review.
17 Jul 2009 Google states that the 100-attempt limit is sufficiently robust, although the proof of concept demonstrates how to bypass this control. Publication of the advisory on the lists.

References

Sobre Internet Security Auditors

Company based in Spain and Colombia, specializing in web application auditing, network security, penetration testing, and compliance implementation and assessment. Our clients include some of the largest finance, telecommunications, insurance, and ICT companies. A vendor-independent provider with in-depth experience since 2001. Our R&D efforts include vulnerability research, collaboration on open security projects, whitepapers, and participation in industry events.

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