HelpSystems Cobalt Strike Server 4.2/4.3 Screenshot readCountedBytes Hotcobalt denial of service
|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.
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.
CVSSv3VulDB 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: 🔍
VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍
ExploitingClass: Denial of service
Programming Language: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒
Threat IntelligenceInterest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍
Reaction Time: 🔒
0-Day Time: 🔒
Exposure Time: 🔒
Upgrade: Cobalt Strike Server 4.4
Timeline07/19/2021 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
CVE: CVE-2021-36798 (🔒)
scip Labs: https://www.scip.ch/en/?labs.20161013
EntryCreated: 08/04/2021 08:02 PM
Updated: 08/08/2021 07:51 AM
Changes: (1) source_cve_assigned
Do you want to use VulDB in your project?
Use the official API to access entries easily!