VDB-176104 · MVID-2021-0233 · GCVE-100-176104

Backdoor.Win32.WinShell.a Service Port 1337 backdoor

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.7	$0-$5k	0.00

Summaryinfo

A vulnerability described as critical has been identified in Backdoor.Win32.WinShell.a. Impacted is an unknown function of the component Service Port 1337. Executing a manipulation can lead to backdoor. The attack may be launched remotely. Furthermore, there is an exploit available. The application of restrictive firewalling is recommended.

Detailsinfo

A vulnerability classified as critical was found in Backdoor.Win32.WinShell.a (Remote Access Software) (unknown version). This vulnerability affects an unknown code block of the component Service Port 1337. The manipulation with an unknown input leads to a backdoor vulnerability. The CWE definition for the vulnerability is CWE-912. The product contains functionality that is not documented, not part of the specification, and not accessible through an interface or command sequence that is obvious to the product's users or administrators. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was shared 05/31/2021 as MVID-2021-0233. The advisory is shared for download at malvuln.com. Technical details are unknown but a public exploit is available. The MITRE ATT&CK project declares the attack technique as T1588.001.

It is possible to download the exploit at malvuln.com. It is declared as proof-of-concept.

Proper firewalling of is able to address this issue.

VulDB is the best source for vulnerability data and more expert information about this specific topic.

Productinfo

Type

Remote Access Software

Name

Backdoor.Win32.WinShell.a

CPE 2.3info

🔍

CPE 2.2info

🔍

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.3
VulDB Meta Temp Score: 6.7

VulDB Base Score: 7.3
VulDB Temp Score: 6.7
VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Backdoor
CWE: CWE-912
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍
Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Firewall
Status: 🔍

0-Day Time: 🔍

Timelineinfo

05/31/2021 🔍
05/31/2021 +0 days 🔍
05/31/2021 +0 days 🔍

Sourcesinfo

Advisory: MVID-2021-0233
Status: Not defined

GCVE (VulDB): GCVE-100-176104
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 05/31/2021 17:00
Changes: 05/31/2021 17:00 (39)
Complete: 🔍
Submitter: malvuln
Cache ID: 216::103

Submitinfo

Accepted

Submit #13710: Backdoor.Win32.WinShell.a / Unauthenticated Remote Command Execution (by malvuln)