Exchange SMTP Encapsulated Relay
Description
Microsoft Exchange 4.x and 5.x allow a remote attacker to relay email (i.e. spam) using encapsulated SMTP addresses, even if the anti-relaying features are enabled.
An encapsulated address looks like this: IMCEASMTP-encapsulatedaddress@yourdomain.com
where encapsulatedaddress is the encoded destination email address. The encoding scheme is as follows: replace "@" with "+40", replace "." with "+2E".
Solution(s)
- install-exchange-5_5-patch-postsp2-imcfix
- Lightweight Endpoint Agent
- Live Dashboards
- Real Risk Prioritization
- IT-Integrated Remediation Projects
- Cloud, Virtual, and Container Assessment
- Integrated Threat Feeds
- Easy-to-Use RESTful API
- Automation-Assisted Patching
- Automated Containment
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– Scott Cheney, Manager of Information Security, Sierra View Medical Center