How to find Exim mail servers on your network
In their security advisory for 21Nails, the Qualys Research team communicated their discovery of several critical vulnerabilities in Exim mail servers that can be exploited for unauthenticated code execution and root privileges.
Recently, maintainers of the Exim mail server released updates to patch the vulnerabilities. If you have Exim mail servers, you must patch them immediately.
According to the Qualys blog, a Shodan search showed nearly 4 million Exim servers exposed to the internet. Their accessibility makes these mail transfer agents targets for attackers.
With Rumble, you can find Exim mail servers in your inventory with this pre-built query. This query searches for any live asset that has protocol
exim in the banner.
_asset.protocol:smtp and protocol:smtp and banner:exim
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