CVE-2023-30872 is a high-severity SQL Injection vulnerability affecting BannerSky's BSK Forms Blacklist product, specifically versions up to 3.6.2. The vulnerability arises from improper neutralization of special elements used in SQL commands (CWE-89), allowing an attacker with high privileges to inject malicious SQL code. According to the CVSS 3.1 vector (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L), the attack can be launched remotely over the network with low attack complexity, but requires the attacker to have high-level privileges (PR:H) on the system. No user interaction is needed. The scope is changed (S:C), indicating that exploitation can affect resources beyond the vulnerable component. The impact is critical on confidentiality (C:H), with no impact on integrity (I:N), and low impact on availability (A:L). This means an attacker could exfiltrate sensitive data from the backend database but cannot modify or delete data or cause significant denial of service. No known exploits are currently reported in the wild, and no patches have been linked yet. The vulnerability is listed as published on December 20, 2023, and has been enriched by CISA, indicating recognition by US cybersecurity authorities. The vulnerability affects the SQL query handling in the BSK Forms Blacklist component, which is likely used to filter or blacklist form inputs. Improper sanitization or parameterization of SQL queries allows injection of crafted SQL commands, potentially exposing sensitive data stored in the database. Given the requirement for high privileges, exploitation might be limited to insiders or attackers who have already compromised an account with elevated rights. However, the changed scope and high confidentiality impact make this a serious concern for organizations using this product in their web infrastructure.

For European organizations using BannerSky BSK Forms Blacklist, this vulnerability poses a significant risk to the confidentiality of sensitive data processed or stored by the affected systems. Since the vulnerability allows high-privilege attackers to extract confidential information from backend databases, organizations handling personal data, financial information, or intellectual property could face data breaches. This is particularly critical under the GDPR framework, where unauthorized disclosure of personal data can lead to substantial fines and reputational damage. The low impact on integrity and availability means attackers cannot easily alter data or disrupt services, but the confidentiality breach alone is sufficient to cause regulatory and operational consequences. The requirement for high privileges reduces the risk of external attackers exploiting this vulnerability directly, but insider threats or attackers who have escalated privileges could leverage it. Organizations relying on BSK Forms Blacklist as part of their web form filtering or security controls should be aware that this vulnerability undermines the trustworthiness of these controls and could be a vector for data exfiltration. The changed scope indicates that exploitation could affect other components or data stores beyond the immediate vulnerable module, potentially broadening the impact within an organization’s IT environment.

1. Immediate mitigation should focus on restricting access to the BSK Forms Blacklist administrative interfaces and backend systems to trusted personnel only, minimizing the risk of privilege escalation or insider exploitation. 2. Implement strict network segmentation and firewall rules to limit remote access to the affected systems, reducing the attack surface. 3. Monitor logs and database queries for unusual or suspicious activity indicative of SQL injection attempts, especially from accounts with high privileges. 4. Employ Web Application Firewalls (WAFs) with custom rules to detect and block SQL injection patterns targeting the BSK Forms Blacklist component. 5. Until an official patch is released, consider disabling or isolating the vulnerable BSK Forms Blacklist functionality if feasible, or replacing it with alternative form filtering solutions that do not have this vulnerability. 6. Conduct a thorough review of user privileges and enforce the principle of least privilege to ensure no unnecessary high-level access is granted. 7. Prepare for rapid deployment of patches once available by maintaining an up-to-date inventory of affected systems. 8. Educate internal teams about the risks of SQL injection and the importance of secure coding and input validation practices to prevent similar vulnerabilities in custom or integrated components.