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SMSGate Denial of Service
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SUMMARY
<http://www.netwinsite.com/smsgate/> SMSGate is "a gateway from Email to
SMS and back". A vulnerability in the way SMSGate handles incoming HTTP
requests allows remote attackers to cause the server to crash.
DETAILS
Vulnerable Systems:
* SMSGate version 1.1n
SMSGate provides both the SMTP/SMS interface and a SSL web administration
service running on port 8775 and by default accessible only locally
(127.0.0.1).
When a too big HTTP Content-Length value is received, the server tries to
allocate the specified amount of memory and when fails shows a debug
messagebox in which the admin must choose if aborting the application,
debugging it or ignoring the problem (in which case the server will
continue to work correctly).
The entire server will be completely unreachable for all the time the
Ignore button is not selected, so nobody can send SMS and the remote admin
can't manage the server.
Exists also another problem caused by a malformed or non-existent
Content-Length value which causes only the showing of an error messagebox
(about the impossibility of writing the NULL delimiter at uninitialized
pointer at offset 0xcccccccc) since the server will continue to work
correctly.
Note the limitation described at the beginning of this section (local IPs
only) doesn't affect the exploiting of the vulnerability, so any attacker
from any IP address can block the server.
Exploit:
Send the following HTTP request through netcat + stunnel:
POST / HTTP/1.0
Content-Length: -1
ADDITIONAL INFORMATION
The information has been provided by <mailto:aluigi@autistici.org> Luigi
Auriemma.
The original article can be found at:
<http://aluigi.altervista.org/adv/smsgheit-adv.txt>
http://aluigi.altervista.org/adv/smsgheit-adv.txt
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