CVE-2015-3628 in BIG-IP
Summary
by MITRE
The iControl API in F5 BIG-IP LTM, AFM, Analytics, APM, ASM, Link Controller, and PEM 11.3.0 before 11.5.3 HF2 and 11.6.0 before 11.6.0 HF6, BIG-IP AAM 11.4.0 before 11.5.3 HF2 and 11.6.0 before 11.6.0 HF6, BIG-IP Edge Gateway, WebAccelerator, and WOM 11.3.0, BIG-IP GTM 11.3.0 before 11.6.0 HF6, BIG-IP PSM 11.3.0 through 11.4.1, Enterprise Manager 3.1.0 through 3.1.1, BIG-IQ Cloud and Security 4.0.0 through 4.5.0, BIG-IQ Device 4.2.0 through 4.5.0, and BIG-IQ ADC 4.5.0 allows remote authenticated users with the "Resource Administrator" role to gain privileges via an iCall (1) script or (2) handler in a SOAP request to iControl/iControlPortal.cgi.
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Analysis
by VulDB Data Team • 07/20/2024
The vulnerability described in CVE-2015-3628 represents a critical privilege escalation flaw within the iControl API framework of F5 BIG-IP products across multiple modules including Local Traffic Manager, Application Firewall, Analytics, Access Policy Manager, Application Security Manager, Link Controller, and PEM. This vulnerability specifically affects versions prior to the mentioned hotfix releases, creating a persistent security gap that could be exploited by authenticated attackers who possess the Resource Administrator role. The iControl API serves as a core management interface for F5 BIG-IP systems, enabling remote administration and configuration of network services through SOAP-based web services. The flaw stems from inadequate input validation and privilege checking mechanisms within the API's processing of iCall scripts and handlers, which are used for executing automated tasks and managing system events. This vulnerability directly maps to CWE-269: Improper Privilege Management, as it allows an attacker with limited administrative permissions to escalate their privileges to higher levels within the system. The impact extends beyond simple privilege escalation, as the affected components include critical security services such as Application Firewall and Application Security Manager, potentially allowing attackers to bypass security controls and gain unauthorized access to protected resources.
The technical exploitation of this vulnerability occurs through crafted SOAP requests sent to the iControl/iControlPortal.cgi endpoint, where the system processes iCall scripts and handlers without proper authorization checks. When an authenticated user with the Resource Administrator role submits a malicious SOAP request containing specially crafted iCall components, the system fails to validate whether the requesting user has sufficient privileges to execute the operations contained within these components. This processing flaw allows the attacker to execute arbitrary code with elevated privileges, effectively bypassing the role-based access controls that should restrict their capabilities. The vulnerability is particularly concerning because iCall functionality is designed to automate administrative tasks and system responses, making it a powerful tool for attackers to establish persistent access or perform destructive operations. The attack vector demonstrates characteristics consistent with ATT&CK technique T1068: Exploitation for Privilege Escalation, where an attacker leverages existing access to escalate their privileges within the system. The affected products span multiple F5 BIG-IP modules, indicating a widespread issue that could affect organizations using various network security and application delivery services from F5.
The operational impact of this vulnerability is severe and multifaceted, potentially allowing attackers to gain unauthorized access to critical network infrastructure and security services. Organizations using vulnerable F5 BIG-IP systems could face complete compromise of their network security posture, as attackers with the Resource Administrator role could escalate to full administrative privileges and access sensitive configuration data, user credentials, and network traffic. The vulnerability affects both security-focused modules like Application Firewall and Application Security Manager, as well as infrastructure management components, creating a comprehensive attack surface that could be exploited for data exfiltration, service disruption, or lateral movement within the network. The attack requires only authentication credentials and does not necessitate network-level access or complex exploitation techniques, making it particularly dangerous for organizations with insufficient network segmentation or monitoring controls. The affected versions include multiple product lines and service modules, suggesting that organizations with complex F5 BIG-IP deployments could be vulnerable across their entire infrastructure. This vulnerability could also be leveraged as a stepping stone for further attacks, potentially allowing attackers to establish persistent backdoors or access other systems within the organization's network environment.
Organizations should immediately implement mitigation strategies including applying the vendor-supplied hotfixes and security patches for all affected versions of F5 BIG-IP products, particularly focusing on the specific hotfix releases mentioned in the vulnerability description. Network segmentation and monitoring should be enhanced to detect and prevent unauthorized SOAP requests to the iControl API endpoints, with particular attention to unusual patterns of iCall script execution. Access controls should be reviewed and strengthened, ensuring that the Resource Administrator role is only granted to users who require such privileges for legitimate administrative tasks. The implementation of principle of least privilege should be enforced, limiting the scope of iCall script execution and restricting which users can submit potentially malicious SOAP requests. Additionally, organizations should conduct comprehensive vulnerability assessments across all F5 BIG-IP deployments to identify and remediate similar issues within their infrastructure. Regular security audits and penetration testing should be performed to validate that the implemented mitigations are effective and that no other similar privilege escalation vulnerabilities exist within the environment. The remediation process should include monitoring for any signs of exploitation attempts and establishing incident response procedures specifically tailored to address this type of vulnerability. Organizations should also consider implementing network-based intrusion detection systems that can identify and alert on suspicious SOAP request patterns targeting the iControl API endpoints, providing early warning of potential exploitation attempts.