Blat 3.2.14 Denial Of Service
Posted on 16 June 2016
Hi Hackers, Greetings from Vishnu (@dh4wk) 1. Vulnerable Product Version: *Blat v3.2.14* Link: blat.net 2. Vulnerability Information Impact: Attacker may gain administrative access / can perform a DOS Remotely Exploitable: No Locally Exploitable: May be possible 3. Product Details An open source Windows (32 & 64 bit) command line SMTP mailer. We can use it to automatically email logs, the contents of a html FORM, or whatever else you need to send. Since blat is lightweight, user friendly and simple (but awesome) many vendors incorporates it with their Softwares. I have seen blat in many commercial Softwares which use it for sending mails to its customers. And Blat is awesome. 4. Vulnerability Description The Overflow vulnerability lies in the profile option parameter “–p”. When a string of 236 bytes is send to blat, the EBP and EIP register gets overwritten by the user input. Reproduction: * blat.exe crashes with this command blat.exe –install smtp.my.tld 127.0.0.1 –p <”A”*234+”B”*2>* Feeding this command overwrites EBP with 0x00410041 and EIP with 0x00420042 (Please refer to the attached screen shot) 5. Links https://sourceforge.net/projects/blat/ https://groups.yahoo.com/neo/groups/blat/conversations/messages/13759 Regards, Vishnu (@dh4wk)
