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Sendmail SMTP Address prescan Memory Corruption

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Sendmail SMTP Address prescan Memory Corruption

Disclosed
09/17/2003
Created
05/30/2018

Description

This is a proof of concept denial of service module for Sendmail versions 8.12.8 and earlier. The vulnerability is within the prescan() method when parsing SMTP headers. Due to the prescan function, only 0x5c and 0x00 bytes can be used, limiting the likelihood for arbitrary code execution.

Author(s)

  • aushack <patrick@osisecurity.com.au>

Development

References

Module Options

To display the available options, load the module within the Metasploit console and run the commands 'show options' or 'show advanced':

msf > use auxiliary/dos/smtp/sendmail_prescan
msf auxiliary(sendmail_prescan) > show actions
    ...actions...
msf auxiliary(sendmail_prescan) > set ACTION < action-name >
msf auxiliary(sendmail_prescan) > show options
    ...show and set options...
msf auxiliary(sendmail_prescan) > run 

Time is precious, so I don’t want to do something manually that I can automate. Leveraging the Metasploit Framework when automating any task keeps us from having to re-create the wheel as we can use the existing libraries and focus our efforts where it matters.

– Jim O’Gorman | President, Offensive Security

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