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[CSO10002] Attachment path traversal in Outlook Web Access

This trick is mostly useful but can also be used for wrong purposes. Since it is so simple, itâs 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:

1-Install firefox
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

Ricardo Martins
CISA, ISO 27001/20000 LA
Compliance & Consulting Manager
Tel: +351 210 111 616ÂÂÂÂ Fax: +351 210 111 618ÂÂÂÂ www.cso.ptÂÂÂÂÂinfo@xxxxxx 
Chief Security Officers, SA.
Edificio Infante D. Henrique
Rua JoÃo Chagas, 53 - 1Â Esq.
1495-764 Dafundo
empresa do grupo
Art of Knowledge
ï Pense no Ambiente antes de imprimir / Consider the Environment before printing