IE10 bug? Hotmail / Live / Outlook web interface security compromised?

Kari

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Noticed this when I had accidentally selected Keep me signed in on a PC not belonging to me when checking my Outlook.com emails using Windows 7, IE10 and Outlook.com web interface. Need help to find out how to avoid this kind of situation.

Scenario: Opening Outlook.com with IE10. Logging in with my [email protected], accidentally selecting Keep me signed in. All is well, check mails, reply to a few, sign out, closed IE10, shut down the computer.

Was leaving when someone I was waiting to go with asked me to wait 10 more minutes. With extra time in my hands decided to check my other Hotmail account, too. Booted the same PC, opened IE10, went again to Outlook.com and to my surprise it opened to my outlook.com account I had checked earlier, directly without asking for credentials.

I was absolutely sure I had not only closed the IE10 and shut down the PC, but first selected Sign Out from Outlook.com menus. In my opinion this, selecting to log out / sign out should invalidate earlier Keep me signed in selection?

Came home, decided to test this. Here's how it went:
Opening Outlook.com on IE10, entering my [email protected] credentials and selecting Keep me signed in (this time deliberately):

Outlook.com_1.png

Web interface opens, everything OK:

Outlook.com_2.png

Selecting Sign Out:

Outlook.com_3.png

Sign out successful:

Outlook.com_4.png

Logging in with another Hotmail account, this time with [email protected], not selecting Keep me signed in:

Outlook.com_5.png

Signing out from this second account:

Outlook.com_6.png

Sign out successful:

Outlook.com_4.png

Closed IE10. Reopened IE10, the first mail account ([email protected]) appears on Outlook.com as soon as the page is opened, credentials never asked:

Outlook.com_2.png

My email account can be viewed without credentials simply by closing and reopening IE10, regardless which Hotmail / Live / Outlook.com was opened and signed in and when the account was signed out when the browser was closed.

It seems to me that Outlook.com is not allowing to completely sign out from Outlook.com if Keep me signed in has been selected. In my tests now the account used to sign in with this option will always open automatically without credentials when IE10 is restarted.

Any opinions, tips, advice? I do not like this kind of security leaks, I'm even willing to take the Darwin Award if needed: if this is my own doing, please tell it for me!

Kari
 
Last edited:

My Computer My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
HP ENVY 17-1150eg
OS
Windows 10 Pro x64 EN-GB
CPU
1.6 GHz Intel Core i7-720QM Processor
Memory
6 GB
Graphics Card(s)
ATI Mobility Radeon HD 5850 Graphics
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Beats sound system with integrated subwoofer
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17" laptop display, 22" LED and 32" Full HD TV through HDMI
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External: 2TB for backups, 3TB USB3 network drive for media
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As Envy runs a bit warm, I have it on a Cooler Master pad
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Logitech Performance Mouse MX
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Windows Defender 4.3.9431.0
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Maxthon 3.5.2., IE11
I don't know if this might help as it's about Win8/IE10, but you can take a look.
Maybe IE10 is saving the registry cookies noted in the the last post (Dec. 20, 2012)?
If you have a PC with IE9, could you test that and see if you have the same issue?

Disable Automatic Microsoft Website signon in IE10
 

My Computer My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
home built
OS
Multi-Boot W7_Pro_x64 W8.1_Pro_x64 W10_Pro_x64 +Linux_VMs +Chromium_VM
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AMD Athlon II x4 620
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Gigabyte GA-MA785G-UD3H
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6GB GSkill DDR2 800
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on board Realtek ALC889A
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Not currently OCd, under-volted.
I use Hybrid sleep, rarely re-boot or shutdown.

Hauppauge HD-PVR, Avermedia PCIe TV Tuner, Hauppauge PCI TV Tuner.
Thanks for the tip, will check it.
 

My Computer My Computer

Computer type
Laptop
Computer Manufacturer/Model Number
HP ENVY 17-1150eg
OS
Windows 10 Pro x64 EN-GB
CPU
1.6 GHz Intel Core i7-720QM Processor
Memory
6 GB
Graphics Card(s)
ATI Mobility Radeon HD 5850 Graphics
Sound Card
Beats sound system with integrated subwoofer
Monitor(s) Displays
17" laptop display, 22" LED and 32" Full HD TV through HDMI
Screen Resolution
1600*900 (1), 1920*1080 (2&3)
Hard Drives
Internal: 2 x 500 GB SATA Hard Disk Drive 7200 rpm
External: 2TB for backups, 3TB USB3 network drive for media
Cooling
As Envy runs a bit warm, I have it on a Cooler Master pad
Keyboard
Logitech diNovo Media Desktop Laser (bluetooth)
Mouse
Logitech Performance Mouse MX
Internet Speed
50/10 Mbps VDSL
Antivirus
Windows Defender 4.3.9431.0
Browser
Maxthon 3.5.2., IE11
The cookie you set when using Keep Me Signed in is still there when you log off and turn the computer off. When you reboot the saved cookie is activated again.
It is probably a (atdmt.com) cookie. Run Super Anti Spyware and you will find it. It will stay gone if removed by SAS until you select Keep Me Signed In again. If you sign in every time you use your email the cookie does not come back.
This might help.
http://www.sevenforums.com/browsers-mail/265683-microsofts-atdmt-com-cookies.html
 

My Computer My Computer

Computer type
PC/Desktop
Computer Manufacturer/Model Number
Home made Desktop
OS
Windows 10 Pro. 64/ version 1709 Windows 7 Pro/64
CPU
Intel i7-6800K @ 4.3
Motherboard
ASUS X-99 Deluxe II
Memory
Corsair Platinum 16 gig @2400
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EVGA GTX 1070 OC
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Asus 27" LED LCD/VE278Q
Screen Resolution
1920-1080 or 1280-720 HDMI
Hard Drives
INTEL SSD 730-240 Gb Sata 3.0/
PSU
EVGA Platium 1200W
Case
Phanteks Luxe Tempered Glass 8 fans/ one radiator
Cooling
XSPC/ Water Cooled CPU
Keyboard
Das 4 Professional
Mouse
Logitech M705/MX Anywhere 2-S
Internet Speed
100 mbits
Antivirus
Microsoft Security Essentials/ Malwarebytes Premium 3.0/ SAS
Browser
I.E. 11 default/Firefox/ ISP Time Warner Cable/Spectrum
Other Info
LG BluRay Burner/
Sound system-KLipsch-THX/
Icy Dock ssd Hot Swap bays.
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