Snom SIP Phone Denial Of Service

`Snom SIP phones (www.snom.com) have a builtin HTTP/HTTPS configuration  
interface, which is enabled by default.  
  
By making a single HTTP POST request all available memory (and CPU) can be  
exhausted, resulting in a reboot of the phone.  
This even works if the HTTP/HTTPS interface is protected by username and  
password (probably the credentials are checked a few more lines later when  
the complete request has been received).  
  
Affected models: MP, 3XX, 7XX, 8XX (i didnt have any of the other models to  
test)  
Affected firmwares: latest stable, latest beta (most likely some others too)  
Workaround: Disable HTTP/HTTPS interface completely.  
  
Poc:  
  
dd if=/dev/zero bs=1M count=32 | curl http://IP_OF_PHONE  
<http://ip_of_phone/> --data-binary @-  
  
P.S. Just if you are wondering.... I did not notify the vendor about this.  
Almost two years ago i reported multiple vulnerabilities directly to the  
vendor (including the possibility to install arbitrary software on the  
device), but not much has changed since then.  
  
  
`