Hi all,
The access to corporate web mail services like OWA, iNotes or VPN SSL stuff is
becoming increasingly popular. I saw many posts here about security measures
for protecting Web server itself, filtering viruses and encrypting data in
transit. However, few people address a problem of temporary content stored on
client PCs and stolen session/credentials. Given that companies are looking for
more mobility, the typical use of webmail services occurs on public PCs, kiosks
and Internet cafés.
1. Temporary content. Some Web based email and VPN SSL clients have features to
remove temporary files from the client PCs. The tests we performed (iNotes and
OWA) show that the cleaning is very poor and a lot files and attachements are
still sitting in the IE cache, Temp folder, Acrobat cache, different download
managers like Mozilla or Reget/Getrigt etc. The cleaning is ever worse on any
PC that have non standard OS (Linux, Mac etc.) and browsers like Firefox, Opera
and so on.
2. Stolen session. Some vendors recommend to use SecurID tokens or stuff like
that to prevent stealing users' credentials. However, there is still a lot of
possibility to penetrate user sessions starting from stolen session IDs thru a
malicious email to different sorts of "parent control" software (keylogger +
file/clipboard/web pages sniffer + screenshots every 15 seconds ...). One never
khows what is running on that regular public PC.
I would like to hear from you any ideas on how did you mitigate these risks and
what was your reasonong to allow/disallow the access to your company's webmail.
Thank you in advance
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