CVE-2014-9038 in WordPress
Summary
by MITRE
wp-includes/http.php in WordPress before 3.7.5, 3.8.x before 3.8.5, 3.9.x before 3.9.3, and 4.x before 4.0.1 allows remote attackers to conduct server-side request forgery (SSRF) attacks by referring to a 127.0.0.0/8 resource.
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Analysis
by VulDB Data Team • 03/02/2022
The vulnerability identified as CVE-2014-9038 represents a critical server-side request forgery flaw within the WordPress content management system that affects multiple versions prior to specific security patches. This vulnerability exists in the wp-includes/http.php file and enables remote attackers to manipulate the application's HTTP request handling capabilities. The flaw specifically allows malicious actors to target internal network resources that fall within the 127.0.0.0/8 IP address range, which encompasses localhost and loopback addresses typically restricted from external access. The vulnerability stems from inadequate input validation and sanitization within the HTTP request processing logic, creating a pathway for attackers to bypass normal network restrictions and potentially access internal services that should remain isolated from external networks.
The technical implementation of this vulnerability involves the WordPress application's inability to properly validate and restrict HTTP requests that attempt to access localhost or loopback addresses. When the system processes HTTP requests through the affected http.php file, it fails to adequately filter or block requests directed to the 127.0.0.0/8 network range, which includes all IP addresses from 127.0.0.1 through 127.255.255.255. This oversight allows attackers to construct malicious requests that could potentially access internal services such as databases, administrative interfaces, or other network resources that are typically protected by network segmentation and firewall rules. The vulnerability operates at the application layer and can be exploited without requiring authentication or privileged access to the WordPress installation itself, making it particularly dangerous in environments where internal network resources are not properly secured.
The operational impact of this vulnerability extends beyond simple information disclosure, as it provides attackers with the ability to conduct reconnaissance and potentially exploit internal services that are not directly exposed to the internet. Attackers can leverage this vulnerability to map internal network topology, identify running services, and potentially gain access to sensitive data or administrative interfaces that are normally protected by network security controls. The vulnerability can be exploited to perform various malicious activities including but not limited to accessing internal databases, conducting port scanning of internal services, or even potentially escalating privileges if internal services are misconfigured or contain additional vulnerabilities. This type of vulnerability directly violates the principle of least privilege and network segmentation that security professionals rely upon to protect critical infrastructure.
Organizations affected by CVE-2014-9038 should implement immediate mitigation measures including upgrading to the patched versions of WordPress as specified in the advisory. The vulnerability aligns with CWE-918, which describes server-side request forgery vulnerabilities that enable attackers to manipulate the server into making unintended requests to internal resources. From an ATT&CK framework perspective, this vulnerability maps to techniques involving reconnaissance and privilege escalation through service exploitation. Security teams should also consider implementing network-level mitigations such as firewall rules that block outbound requests to the 127.0.0.0/8 range from web servers, though the primary defense remains proper software patching. Additionally, organizations should review their overall security posture and ensure that internal services are properly isolated and secured, as this vulnerability demonstrates the potential for attackers to bypass traditional network security controls through application-level flaws. The vulnerability underscores the importance of input validation and the principle that applications should never trust user-provided data without proper sanitization and validation.