Cobalt Strike Remote Code Execution Vulnerability via Swing Component HTML Injection (CVE-2022-42948)
Executive & SecOps Summary
SECOPS ASSESSMENTCobalt Strike version 4.7.1
Remote attackers can execute arbitrary code within the Cobalt Strike UI context by injecting crafted HTML payloads
Immediately upgrade to Cobalt Strike version 4.7.2 or later, and restrict access to the Teamserver
Affected Products & Version Scope
Remediation & Live Workaround Commands
PATCH & WORKAROUND1. Official Patch & Version Upgrade Commands
The recommended remediation is to upgrade to Cobalt Strike version 4.7.2 or later, where HTML rendering in Swing components has been properly mitigated. Run the official update utility to apply the patch.
# Navigate to the Cobalt Strike directory and run the updater
cd /opt/cobaltstrike
./update2. Temporary Workaround & Hardening Configuration
If an immediate upgrade is not feasible, restrict access to the Cobalt Strike Teamserver port (default: 50050) using firewall rules to ensure only trusted operator IPs can connect.
# Restrict Teamserver port 50050 to a specific trusted operator IP
sudo iptables -A INPUT -p tcp -s 10.10.10.50 --dport 50050 -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 50050 -j DROP3. Log Audit & IoC Verification Commands
Use the following commands to verify the running Cobalt Strike version and inspect Teamserver logs for potential HTML injection attempts.
# Extract and check the version from the Cobalt Strike JAR manifest
unzip -p /opt/cobaltstrike/cobaltstrike.jar META-INF/MANIFEST.MF | grep 'Version'
# Scan Teamserver logs for suspicious HTML tags or object injections
grep -riE '(<html|<object|<applet|<script)' /opt/cobaltstrike/logs/Block Kernel Privilege Escalation & Ransomware Payloads Before You Can Reboot
Protect unpatched Windows, Linux, and macOS workloads against in-memory exploitation and lateral movement with autonomous EDR.
Technical Root Cause & Exploitation Mechanics
1. Vulnerability Overview & Root Cause
This vulnerability (CVE-2022-42948) exists in Cobalt Strike version 4.7.1 and stems from the default behavior of Java Swing components used in the client user interface (UI). Java Swing components (such as JLabel or JEditorPane) automatically interpret and render text as HTML if it begins with the '<html>' tag. Because the Cobalt Strike UI failed to properly sanitize and escape HTML tags from external inputs (such as beacon metadata, process lists, or usernames) before rendering them, an attacker can inject malicious HTML and Java code.
2. Exploitation Mechanics & Attack Scenario
An attacker can exploit this vulnerability by manipulating metadata sent from a compromised host or a rogue beacon to the Cobalt Strike Teamserver. For instance, by registering a beacon with a computer name containing malicious HTML tags (e.g., '<html><object classid=...>' or referencing a malicious Java class), the payload is stored on the Teamserver. When a security analyst or operator opens the Cobalt Strike UI and views the beacon details, the Swing component renders the injected HTML, triggering the execution of arbitrary Java code on the operator's local workstation.
3. Infrastructure & Business Impact
While Cobalt Strike is a widely used tool for penetration testing and red teaming, this vulnerability allows blue teams or hostile threat actors to counter-exploit the red team operators. Successful exploitation leads to full compromise of the operator's workstation, potentially exposing sensitive engagement data, client infrastructure access paths, and active credentials, resulting in severe operational and reputational damage.
Official Vendor Advisories & References
Cobalt Strike 4.7.1 fails to properly escape HTML tags when they are displayed on Swing components. By injecting crafted HTML code, it is possible to remotely execute code in the Cobalt Strike UI.
Frequently Asked SecOps Questions (CVE-2022-42948)
FAQQ1. How critical is CVE-2022-42948 and is it actively exploited in the wild?
CVE-2022-42948 is rated CVSS 9.8 (CRITICAL) with a 30-day EPSS exploitation probability of 2.7%. It is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, requiring immediate emergency remediation.
Q2. Which vendors and products are affected by CVE-2022-42948?
Primary impacted vendors include helpsystems, fortra across cobalt strike. Scope summary: Cobalt Strike version 4.7.1
Q3. What temporary mitigations or workarounds exist for CVE-2022-42948 before patching?
[Mitigation] Immediately upgrade to Cobalt Strike version 4.7.2 or later, and restrict access to the Teamserver Follow the CLI remediation commands and interactive SecOps checklist on this page to restrict exposure prior to your maintenance window.
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