CVE-2025-2243: Bitdefender GravityZone SSRF Vulnerability

CVE-2025-2243 Overview

A server-side request forgery (SSRF) vulnerability has been identified in the Bitdefender GravityZone Console that allows attackers to bypass input validation logic using leading characters in DNS requests. This vulnerability enables malicious actors to craft requests that circumvent security controls designed to restrict server-side request destinations. When combined with other potential vulnerabilities, this bypass technique could potentially be leveraged for execution of third-party code on affected systems.

Critical Impact

Attackers can bypass DNS input validation in GravityZone Console, potentially enabling access to internal resources and, when chained with other vulnerabilities, remote code execution.

Affected Products

• Bitdefender GravityZone Console versions prior to 6.41.2.1
• Enterprise deployments using vulnerable GravityZone management console instances
• Organizations relying on GravityZone for centralized endpoint security management

Discovery Timeline

• 2025-04-04 - CVE-2025-2243 published to NVD
• 2025-07-30 - Last updated in NVD database

Technical Details for CVE-2025-2243

Vulnerability Analysis

This SSRF vulnerability (CWE-918) exists in the Bitdefender GravityZone Console's DNS request handling mechanism. The flaw stems from improper input validation that fails to adequately sanitize leading characters in DNS requests. Attackers can exploit this weakness to manipulate the server into making requests to arbitrary destinations, potentially including internal network resources that should not be accessible from external sources.

The vulnerability is accessible over the network without requiring authentication or user interaction. While the individual impact on confidentiality, integrity, and availability is limited, the true danger lies in the potential for chaining this SSRF with other vulnerabilities to achieve more severe outcomes, including remote code execution.

Root Cause

The root cause of this vulnerability is insufficient input validation in the DNS request processing logic within the GravityZone Console. Specifically, the application fails to properly handle leading characters in DNS hostnames, allowing attackers to craft specially formatted DNS requests that bypass the intended validation checks. This represents a classic input sanitization failure where edge cases in the input format are not adequately addressed by the security controls.

Attack Vector

The attack vector for CVE-2025-2243 is network-based, requiring no authentication or user interaction. An attacker can exploit this vulnerability by sending crafted DNS requests to the GravityZone Console that include specially formatted leading characters. These leading characters cause the input validation logic to fail, allowing the attacker to specify arbitrary internal or external destinations for server-side requests.

The exploitation process involves crafting DNS hostnames with leading characters that bypass the validation regex or parsing logic. When the server processes these malformed requests, it resolves and connects to attacker-controlled or internal resources that would normally be blocked. This can be used to probe internal network infrastructure, access metadata services, or retrieve sensitive information from internal endpoints.

Detection Methods for CVE-2025-2243

Indicators of Compromise

• Unusual DNS query patterns originating from GravityZone Console servers containing malformed hostnames or unexpected leading characters
• Server-side requests to internal IP ranges (e.g., 169.254.x.x, 10.x.x.x, 192.168.x.x) from the GravityZone Console
• Unexpected outbound connections from the management console to external hosts not associated with normal Bitdefender operations
• Log entries showing DNS resolution failures followed by successful connections to suspicious destinations

Detection Strategies

• Monitor network traffic from GravityZone Console servers for anomalous DNS queries and HTTP/HTTPS requests to internal network ranges
• Implement web application firewall (WAF) rules to detect and block requests containing suspicious leading characters in DNS-related parameters
• Enable verbose logging on the GravityZone Console and review for unusual request patterns or error messages related to DNS resolution
• Deploy network segmentation monitoring to detect attempts to access internal resources from the console server

Monitoring Recommendations

• Configure SIEM alerts for outbound connections from GravityZone Console to non-standard destinations
• Establish baseline network behavior for the GravityZone Console and alert on deviations
• Monitor for scanning activity or reconnaissance patterns originating from the console server
• Implement DNS query logging and analysis for requests made by the GravityZone Console service

How to Mitigate CVE-2025-2243

Immediate Actions Required

• Upgrade Bitdefender GravityZone Console to version 6.41.2.1 or later immediately
• Audit GravityZone Console logs for any signs of exploitation attempts or unusual DNS-related activity
• Restrict network access to the GravityZone Console management interface to trusted administrator networks only
• Implement network segmentation to limit the console server's ability to reach sensitive internal resources

Patch Information

Bitdefender has released a security update addressing this vulnerability in GravityZone Console version 6.41.2.1. Organizations should apply this update as soon as possible through their standard patch management processes. For detailed patch information and installation instructions, refer to the Bitdefender Security Advisory.

Workarounds

• Implement strict network egress filtering on the GravityZone Console server to prevent connections to internal metadata services and sensitive endpoints
• Deploy a web application firewall (WAF) in front of the GravityZone Console to filter malicious DNS-related requests
• Use network segmentation to isolate the GravityZone Console from accessing sensitive internal resources directly
• Monitor and restrict outbound DNS queries from the console server to authorized resolvers only

# Example network restriction configuration (firewall rules)
# Block access to internal metadata services from GravityZone Console
iptables -A OUTPUT -s <gravityzone_console_ip> -d 169.254.169.254 -j DROP
iptables -A OUTPUT -s <gravityzone_console_ip> -d 10.0.0.0/8 -p tcp --dport 80 -j DROP
iptables -A OUTPUT -s <gravityzone_console_ip> -d 10.0.0.0/8 -p tcp --dport 443 -j DROP