HelpSystems Cobalt Strike 4.7 XSS via Malformed Username Field in Teamserver
CVE-2022-39197 Published on September 22, 2022
An XSS (Cross Site Scripting) vulnerability was found in HelpSystems Cobalt Strike through 4.7 that allowed a remote attacker to execute HTML on the Cobalt Strike teamserver. To exploit the vulnerability, one must first inspect a Cobalt Strike payload, and then modify the username field in the payload (or create a new payload with the extracted information and then modify that username field to be malformed).
Known Exploited Vulnerability
This Fortra Cobalt Strike Teamserver Cross-Site Scripting (XSS) Vulnerability is part of CISA's list of Known Exploited Vulnerabilities. Fortra Cobalt Strike contains a cross-site scripting (XSS) vulnerability in Teamserver that would allow an attacker to set a malformed username in the Beacon configuration, allowing them to execute code remotely.
The following remediation steps are recommended / required by April 20, 2023: Apply updates per vendor instructions.
Vulnerability Analysis
CVE-2022-39197 can be exploited with network access, requires user interaction. This vulnerability is considered to have a low attack complexity. This vulnerability is known to be actively exploited by threat actors. The potential impact of an exploit of this vulnerability is considered to have a small impact on confidentiality and integrity, and no impact on availability.
Weakness Type
What is a XSS Vulnerability?
The software does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.
CVE-2022-39197 has been classified to as a XSS vulnerability or weakness.
Products Associated with CVE-2022-39197
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Exploit Probability
EPSS (Exploit Prediction Scoring System) scores estimate the probability that a vulnerability will be exploited in the wild within the next 30 days. The percentile shows you how this score compares to all other vulnerabilities.