Vulnerability Assessment & Network Security Forums



If through a vulnerability assessment, a network security issue is detected for the vulnerability below, applying the appropriate security patches in a timely matter is very important.  If you have detected that your system has already been compromised, following CERT's Network Security recovery document will assist with recommended steps for system recovery.


Home >> Browse Vulnerability Assessment Database >> SMTP problems >> Sendmail redirection check


Vulnerability Assessment Details

Sendmail redirection check

Vulnerability Assessment Summary
Redirection check

Detailed Explanation for this Vulnerability Assessment

The remote SMTP server is vulnerable to a redirection attack. That is, if a
mail is sent to :

user@hostname1@victim

Then the remote SMTP server (victim) will happily send the mail to :
user@hostname1

Using this flaw, a possible hacker may route a message through your firewall, in
order to exploit other SMTP servers that can not be reached from the
outside.

Solution : In sendmail.cf, at the top of ruleset 98, in /etc/sendmail.cf,
insert the following statement :
R$*@$*@$* $#error $@ 5.7.1 $: '551 Sorry, no redirections.'

Network Security Threat Level: Low

Networks Security ID:

Vulnerability Assessment Copyright: This script is Copyright (C) 1999 Renaud Deraison

Cables, Connectors

USED CISCO WS-2960X-24PS-L FIRMWARE 15.0(2)EX5 MEMORY 128 MB
$129.95
USED CISCO WS-2960X-24PS-L FIRMWARE 15.0(2)EX5 MEMORY 128 MB pictureNEW CISCO AIR-LAP1142N-A-K9 WIRELESS ACCESS POINT SKU 155229
$249.95
NEW CISCO AIR-LAP1142N-A-K9 WIRELESS ACCESS POINT SKU 155229 pictureAIR-ANT2480V-N Cisco Aironet 8-dBi Omnidirectional Antenna
$45.0
AIR-ANT2480V-N Cisco Aironet 8-dBi Omnidirectional Antenna picture


Discussions

No Discussions have been posted on this vulnerability.