CVE-2022-46830 is a medium-severity vulnerability identified in JetBrains TeamCity versions 2022.10 through 2022.10.1. The vulnerability arises from a custom Security Token Service (STS) endpoint within TeamCity that inadvertently permits internal port scanning. Specifically, this flaw falls under CWE-918, which pertains to server-side request forgery (SSRF) vulnerabilities. SSRF vulnerabilities allow an attacker to induce the server-side application to make HTTP requests to arbitrary domains, including internal network addresses that are typically inaccessible from external sources. In this case, the custom STS endpoint does not properly restrict or validate the target addresses for requests, enabling an attacker to scan internal network ports through the TeamCity server. This can reveal information about internal network topology, open services, and potentially vulnerable internal systems. The vulnerability does not require authentication or user interaction, making it accessible to unauthenticated remote attackers. Although no known exploits are currently reported in the wild, the presence of this SSRF vector in a widely used continuous integration and deployment tool like TeamCity poses a significant risk. The affected versions are limited to 2022.10 and 2022.10.1, and no official patches or updates were linked in the provided data, indicating that mitigation may require configuration changes or updates from JetBrains once available. The vulnerability was publicly disclosed on December 8, 2022, and is enriched by CISA, highlighting its relevance to U.S. cybersecurity authorities.

For European organizations, the impact of CVE-2022-46830 can be substantial, especially for those relying on TeamCity for their software development lifecycle. The ability to perform internal port scanning via the TeamCity server can lead to reconnaissance of internal network infrastructure, exposing sensitive services and systems that are otherwise protected by network segmentation or firewalls. This reconnaissance can be a precursor to more severe attacks such as lateral movement, privilege escalation, or data exfiltration. Given that TeamCity is often integrated into critical development pipelines, exploitation could disrupt continuous integration and deployment processes, potentially delaying software releases and impacting business operations. Furthermore, internal network exposure increases the risk of targeted attacks against internal assets, which may include intellectual property, customer data, or critical infrastructure components. The lack of authentication requirements for exploitation increases the threat surface, allowing external attackers to leverage this vulnerability without prior access. This is particularly concerning for organizations with internet-facing TeamCity instances or insufficient network isolation. Overall, the vulnerability undermines confidentiality and availability, with moderate impact on integrity depending on subsequent attack vectors leveraged after reconnaissance.

To mitigate CVE-2022-46830, European organizations should implement the following specific measures: 1) Immediately review and restrict network access to TeamCity servers, ensuring they are not directly exposed to the internet or untrusted networks. 2) Apply strict firewall rules and network segmentation to limit TeamCity's ability to initiate outbound connections to internal network segments, effectively blocking unauthorized internal port scanning attempts. 3) Monitor and log all outbound requests from TeamCity servers to detect unusual or unauthorized scanning activity. 4) Upgrade TeamCity to the latest available version once JetBrains releases a patch addressing this vulnerability; in the interim, consider rolling back to a version not affected if feasible. 5) Employ Web Application Firewalls (WAFs) or reverse proxies with rules to detect and block SSRF patterns targeting the STS endpoint. 6) Conduct internal security assessments and penetration tests focusing on SSRF and internal network exposure via CI/CD tools. 7) Educate DevOps and security teams about this vulnerability to ensure rapid detection and response. These targeted actions go beyond generic advice by focusing on network-level controls, monitoring, and operational practices specific to TeamCity's architecture and the nature of the SSRF vulnerability.