HelpSystems Cobalt Strike Server 4.2/4.3 Screenshot readCountedBytes Hotcobalt denial of service

EntryeditHistoryDiffjsonxmlCTI
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.
3.2$0-$5k0.00

A vulnerability classified as problematic was found in HelpSystems Cobalt Strike Server 4.2/4.3. Affected by this vulnerability is the function readCountedBytes of the component Screenshot Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. As an impact it is known to affect availability.

The weakness was presented 08/04/2021. The advisory is shared at labs.sentinelone.com. This vulnerability is known as CVE-2021-36798 since 07/19/2021. The exploitation appears to be easy. Access to the local network is required for this attack. The requirement for exploitation is a single authentication. Technical details and also a public exploit are known. MITRE ATT&CK project uses the attack technique T1499 for this issue.

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

Upgrading to version 4.4 eliminates this vulnerability. A possible mitigation has been published immediately after the disclosure of the vulnerability.

Productinfoedit

Vendor

Name

CPE 2.3infoedit

CPE 2.2infoedit

CVSSv3infoedit

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.2

VulDB Base Score: 3.5
VulDB Temp Score: 3.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2infoedit

AVACAuCIA
🔍🔍🔍🔍🔍🔍
🔍🔍🔍🔍🔍🔍
🔍🔍🔍🔍🔍🔍
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock
unlockunlockunlockunlockunlockunlock

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

Exploitinginfoedit

Class: Denial of service
CWE: CWE-404
ATT&CK: T1499

Local: No
Remote: Partially

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

0-Dayunlockunlockunlockunlock
Todayunlockunlockunlockunlock

Threat Intelligenceinfoedit

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

Countermeasuresinfoedit

Recommended: Upgrade
Status: 🔍

Reaction Time: 🔒
0-Day Time: 🔒
Exposure Time: 🔒

Upgrade: Cobalt Strike Server 4.4

Timelineinfoedit

07/19/2021 CVE assigned
08/04/2021 +16 days Advisory disclosed
08/04/2021 +0 days Countermeasure disclosed
08/04/2021 +0 days VulDB entry created
08/08/2021 +4 days VulDB last update

Sourcesinfoedit

Advisory: labs.sentinelone.com
Status: Confirmed

CVE: CVE-2021-36798 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfoedit

Created: 08/04/2021 08:02 PM
Updated: 08/08/2021 07:51 AM
Changes: (1) source_cve_assigned
Complete: 🔍
Submitter: misc

Comments

No comments yet. Languages: . Please log in to comment.

Do you want to use VulDB in your project?

Use the official API to access entries easily!