[NT] AGEphone "sipd.dll" SIP Packet Handling Buffer Overflow

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AGEphone "sipd.dll" SIP Packet Handling Buffer Overflow
------------------------------------------------------------------------


SUMMARY

<http://www.ageet.com/us/agephone/index.htm> AGEphone is "a SIP softphone
written by Ageet". A vulnerability has been found in AGEphone. When
exploited, the vulnerability allows execution of arbitrary code with
privileges of the AGEphone user via a single specially-crafted UDP SIP
packet.

DETAILS

Vulnerable Systems:
* AGEphone for Windows version 1.24
* AGEphone for Windows version 1.38.1

Immune Systems:
* AGEphone for Windows version 1.40

This advisory discloses a buffer overflow vulnerability in AGEphone.

AGEphone uses the unsafe "sscanf()" function when processing a UDP SIP
packet received via its SIP session port. This can cause a stack-based
buffer overflow when a specially-crafted SIP packet is received.

The vulnerability occurs in "sipd.dll" in a function that resembles the
following:
function_100115D0(char *receivedSIPdata)
{
DWORD value;
char buffer1[20];
char buffer2[40];

if(receivedSIPdata != NULL)
{
// Skip leading SPACE and TAB characters
while(*receivedSIPdata != NULL)
{
if(*receivedSIPdata == 0x20 || *receivedSIPdata == 0x09)
receivedSIPdata++;
else
break;
}

if(strnicmp(receivedSIPdata, "SIP/", 4) == 0)
{
// BUFFER OVERFLOW when string read into buffer1 or buffer2 is overly
long!!!

sscanf(receivedSIPdata, "%s %d %s\r\n", buffer1, value, buffer2);
return value;
}
else if(strnicmp(receivedSIPdata, "INVITE", 6) == 0)
{
...
}
else if(...) // Other else-if statements to determine the SIP command
{
}
}
}

Example SIP UDP packet that can trigger the buffer overflow:
SIP/AAAAAAAA[approx-68-bytes]AAAAAA 1 A
From: test
To: test

Or:

SIP/A 1 AAAAAAAA[approx-48-bytes]AAAAAA
From: test
To: test

Disclosure Timeline:
2006-07-21 - Vulnerability Discovered.
2006-07-22 - Initial Vendor Notification.
2006-07-24 - Vendor Released Fixed Version.
2006-07-25 - Public Release.


ADDITIONAL INFORMATION

The information has been provided by <mailto:chewkeong@xxxxxxx> Tan Chew
Keong.
The original article can be found at:
<http://vuln.sg/agephone1381-en.html> http://vuln.sg/agephone1381-en.html



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