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HomeTopics 1Bitcoin & Cryptocurrencies SecurityFlaw in Popular Dev Tool Exploited: TeamCity Users Beware of Ransomware, RATs,...

Flaw in Popular Dev Tool Exploited: TeamCity Users Beware of Ransomware, RATs, and Cryptojacking


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A recently discovered vulnerability in JetBrains TeamCity, a popular continuous integration and continuous delivery (CI/CD) tool, has sent chills down the spines of developers and security professionals alike.

This critical flaw (CVE-2024-27198, CVSS score: 9.8) allows attackers to bypass authentication measures and gain complete administrative control over affected servers. Cybercriminals are actively exploiting this vulnerability to deploy a range of malicious payloads, including ransomware, remote access trojans (RATs), and cryptocurrency miners.

TeamCity Flaw Exploited: Malicious Actors on the Prowl

Security researchers identified a critical security flaw within TeamCity that grants attackers the ability to escalate privileges and gain full administrative access to targeted servers. This vulnerability can be exploited remotely, making it even more dangerous.

Exploitation of this flaw has been linked to a surge in malicious activity targeting TeamCity servers. Reports indicate attackers are deploying a variety of payloads, including:

  • Ransomware: This malicious software encrypts a victim’s files, rendering them inaccessible, and demands a ransom payment for decryption. These attacks can cripple business operations and result in significant financial losses.
  • Remote Access Trojans (RATs): These tools provide attackers with remote control over compromised systems, allowing them to steal sensitive data, launch further attacks, or disrupt operations.
  • Cryptocurrency Miners: Attackers can leverage compromised TeamCity servers to mine cryptocurrency, essentially hijacking computing power for their own financial gain.

Organizations Using TeamCity: What You Need to Do Now

If your organization utilizes TeamCity, immediate action is crucial. Here are 5 critical steps to take:

  1. Patch Immediately: Apply the latest security patch (version 2022.10.1 or later) to your TeamCity server without delay.
  2. Security Audit: Conduct a thorough security audit to identify any potential compromises that may have already occurred.
  3. Password Reset: Reset all passwords associated with TeamCity administration accounts and enforce strong password policies.
  4. Monitor Activity: Closely monitor TeamCity server activity for any suspicious behavior or unauthorized access attempts.
  5. Incident Response Plan: Review and update your incident response plan to ensure preparedness for potential cyberattacks.

There are no magic bullets in cybersecurity, but here are 10 best practices to consider in the long run:

  1. Stay Updated: Always keep your software and firmware updated with the latest security patches.
  2. Least Privilege: Implement the principle of least privilege, granting users only the access level necessary for their tasks.
  3. Strong Passwords & MFA: Enforce strong and unique passwords for all accounts and utilize multi-factor authentication (MFA) where available.
  4. Network Segmentation: Segment your network to limit the potential impact of a cyberattack.
  5. Data Backups: Maintain regular backups of critical data and ensure a robust recovery plan is in place.
  6. Employee Training: Provide regular cybersecurity awareness training for all employees.
  7. Security Assessments: Conduct regular security assessments to identify and address vulnerabilities in your IT systems.
  8. Incident Response Plan: Develop a comprehensive incident response plan to effectively manage cyberattacks.
  9. Threat Intelligence: Stay informed about the latest cyber threats and trends.
  10. Cybersecurity Culture: Foster a culture of cybersecurity within your organization, emphasizing secure practices.


The TeamCity vulnerability serves as a stark reminder of the importance of proactive cybersecurity practices. By staying informed about vulnerabilities, patching systems promptly, and implementing robust security controls, organizations can significantly reduce their cyber risk. Remember, a layered security approach and a commitment to continuous improvement are essential to staying ahead of evolving cyber threats.

Ouaissou DEMBELE
Ouaissou DEMBELEhttps://cybercory.com
Ouaissou DEMBELE is an accomplished cybersecurity professional and the Editor-In-Chief of cybercory.com. He has over 10 years of experience in the field, with a particular focus on Ethical Hacking, Data Security & GRC. Currently, Ouaissou serves as the Co-founder & Chief Information Security Officer (CISO) at Saintynet, a leading provider of IT solutions and services. In this role, he is responsible for managing the company's cybersecurity strategy, ensuring compliance with relevant regulations, and identifying and mitigating potential threats, as well as helping the company customers for better & long term cybersecurity strategy. Prior to his work at Saintynet, Ouaissou held various positions in the IT industry, including as a consultant. He has also served as a speaker and trainer at industry conferences and events, sharing his expertise and insights with fellow professionals. Ouaissou holds a number of certifications in cybersecurity, including the Cisco Certified Network Professional - Security (CCNP Security) and the Certified Ethical Hacker (CEH), ITIL. With his wealth of experience and knowledge, Ouaissou is a valuable member of the cybercory team and a trusted advisor to clients seeking to enhance their cybersecurity posture.


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