Vulnerabilities / Threats
3/3/2009
01:37 PM
Connect Directly
Google+
Twitter
RSS
E-Mail
50%
50%

New Gmail Flaw Lets Attacker Control 'Change Password' Function

Cross-site request forgery (CSRF) vulnerability lets an attacker change Gmail user passwords and hack Gmail accounts -- but Google says it's tough to exploit

A researcher today released a proof-of-concept for a vulnerability he discovered in Google Gmail that lets an attacker change a Gmail user's password, wage a denial-of-service attack on the account, or even access other Gmail users' email.

The cross-site request forgery (CSRF) flaw -- which researcher Vicente Aguilera Diaz from Madrid-based Internet Security Auditors first reported to Google in August 2007 -- takes advantage of the way Gmail's "Change Password" function operates. "The only token for authenticat[ing] the user is a session cookie, and this cookie is sent automatically by the browser in every request," according to the vulnerability disclosure post.

An attacker can build a phony Web page that accepts requests for Gmail password changes, and then lets the attacker change the victims' passwords without their knowing and evading CAPTCHA restrictions.

Google maintains that the flaw is not a major one because such an attack wouldn't be easy to pull off.

This isn't the first CSRF flaw reported in Gmail: In October 2007, the US CERT issued an alert about a CSRF bug that let attackers create mail filters and send mail to arbitrary email accounts. Google patched the bug.

"Cross-site request forgery merely transmits unauthorized commands from a user the Website trusts," said today's Internet Security Auditors' post. CSRF basically exploits the trust a Website site has for a user. An attacker can force the user's browser to request a page or action without the user knowing or the Website recognizing that the request didn't come from the actual, legitimate user.

A Google spokesperson said the company hasn't heard of any such attacks in the wild, but is looking at ways to mitigate abuse of the CSRF flaw. "We've been aware of this report for some time, and we do not consider this case to be a significant vulnerability, since a successful exploit would require correctly guessing a user's password within the period that the user is visiting a potential attacker's site," the spokesperson said. "Despite the very low chance of guessing a password in this way, we will explore ways to further mitigate the issue. We always encourage users to choose strong passwords, and we have an indicator to help them do this."

Internet Security Auditors first reported the vulnerability to Google's security team in August 2007.

Have a comment on this story? Please click "Discuss" below. If you'd like to contact Dark Reading's editors directly, send us a message Kelly Jackson Higgins is Senior Editor at DarkReading.com. She is an award-winning veteran technology and business journalist with more than two decades of experience in reporting and editing for various publications, including Network Computing, Secure Enterprise Magazine, ... View Full Bio

Comment  | 
Print  | 
More Insights
Register for Dark Reading Newsletters
White Papers
Flash Poll
Current Issue
Cartoon
Video
Slideshows
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2014-0972
Published: 2014-08-01
The kgsl graphics driver for the Linux kernel 3.x, as used in Qualcomm Innovation Center (QuIC) Android contributions for MSM devices and other products, does not properly prevent write access to IOMMU context registers, which allows local users to select a custom page table, and consequently write ...

CVE-2014-2627
Published: 2014-08-01
Unspecified vulnerability in HP NonStop NetBatch G06.14 through G06.32.01, H06 through H06.28, and J06 through J06.17.01 allows remote authenticated users to gain privileges for NetBatch job execution via unknown vectors.

CVE-2014-3009
Published: 2014-08-01
The GDS component in IBM InfoSphere Master Data Management - Collaborative Edition 10.0 through 11.0 and InfoSphere Master Data Management Server for Product Information Management 9.0 and 9.1 does not properly handle FRAME elements, which makes it easier for remote authenticated users to conduct ph...

CVE-2014-3302
Published: 2014-08-01
user.php in Cisco WebEx Meetings Server 1.5(.1.131) and earlier does not properly implement the token timer for authenticated encryption, which allows remote attackers to obtain sensitive information via a crafted URL, aka Bug ID CSCuj81708.

CVE-2014-3534
Published: 2014-08-01
arch/s390/kernel/ptrace.c in the Linux kernel before 3.15.8 on the s390 platform does not properly restrict address-space control operations in PTRACE_POKEUSR_AREA requests, which allows local users to obtain read and write access to kernel memory locations, and consequently gain privileges, via a c...

Best of the Web
Dark Reading Radio