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[CSO10002] Attachment path traversal in Outlook Web Access
Feb 03 2010 12:10PM
Ricardo Martins - Chief Security Officers (ricardo martins cso pt)
This trick is mostly useful but can also be used for wrong purposes. Since it is so simple, itâ??s probably already known for some people.
If someone sends you a file through OWA but the file is blocked by a policy, this is what you can do:
2-Access your email and attachment with the following rule:
http://<hostname>/<OWA directory>/<mail box username>/Inbox/<email subject>.EML/<attachment filename>
The best way is to try in following order:
1- http://<hostname>/<OWA directory>/<mail box username>/Inbox â?? you see all your emails
2- http://<hostname>/<OWA directory>/<mail box username>/Inbox/<email subject>.EML â?? you see only your email with the blocked files
3- http://<hostname>/<OWA directory>/<mail box username>/Inbox/<email subject>.EML/<attachment filename> â?? you download the file
The actual address could be different for a couple of reasons. Try to check the attachment URL and use it like shown above.
This can also be exploited through a malicious email with a link inside pointing to the malware directly.
Server environment: Exchange/ OWA 2003 6.5.76*
Client environment: firefox 3.0.15
CISA, ISO 27001/20000 LA
Compliance & Consulting Manager
Tel: +351 210 111 616Â Â Â Â Fax: +351 210 111 618Â Â Â Â www.cso.ptÂ Â Â Â Â info (at) cso (dot) pt [email concealed]
Chief Security Officers, SA.
Edificio Infante D. Henrique
Rua JoÃ£o Chagas, 53 - 1Âº Esq.
empresa do grupo
Art of Knowledge
ïÂ Pense no Ambiente antes de imprimir / Consider the Environment before printing
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