CVE-2018-16529 in Email Security
Summary
by MITRE
A password reset vulnerability has been discovered in Forcepoint Email Security 8.5.x. The password reset URL can be used after the intended expiration period or after the URL has already been used to reset a password.
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Analysis
by VulDB Data Team • 05/22/2020
The vulnerability identified as CVE-2018-16529 represents a critical authentication flaw in Forcepoint Email Security 8.5.x versions that undermines the security of the password reset mechanism. This weakness allows unauthorized users to exploit the password reset functionality beyond its intended time window or after the reset has already been completed, effectively creating a persistent backdoor into the system. The flaw directly impacts the integrity of the authentication process and compromises the overall security posture of email security infrastructure that relies on this software. From a cybersecurity perspective, this vulnerability aligns with CWE-613, which addresses insufficient session expiration, and represents a significant deviation from established security practices for session management and authentication flow control.
The technical implementation of this vulnerability stems from inadequate validation of password reset tokens and their associated expiration timestamps within the Forcepoint Email Security platform. When users initiate a password reset request, the system generates a unique URL containing a time-sensitive token that should only be valid for a specific period and usable only once. However, the flaw permits the reuse of these tokens or allows access beyond their designated expiration time, effectively nullifying the security controls designed to prevent unauthorized access. This issue demonstrates poor implementation of time-based token validation and lacks proper state management for reset requests, creating a persistent security gap that attackers can exploit repeatedly without detection.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it creates opportunities for credential stuffing attacks, account takeover scenarios, and potential lateral movement within networks that depend on compromised email security systems. Security administrators face the challenge of maintaining continuous monitoring for unauthorized reset attempts while dealing with the inherent difficulty of detecting legitimate usage patterns that may be exploited by malicious actors. The vulnerability also undermines trust in the organization's email security infrastructure, potentially leading to increased phishing attack success rates and compromised email communications. From an ATT&CK framework perspective, this vulnerability maps to T1531 for credential access and T1078 for valid accounts, as it enables adversaries to maintain persistent access through compromised authentication mechanisms.
Organizations should immediately implement mitigations including patching to the latest available versions of Forcepoint Email Security, implementing additional authentication controls such as multi-factor authentication, and conducting comprehensive security audits of their email infrastructure. Network segmentation and monitoring of password reset activities should be enhanced to detect anomalous usage patterns, while access controls should be reviewed to ensure that only authorized personnel can perform administrative functions. The vulnerability also necessitates a review of incident response procedures to address potential exploitation scenarios and the implementation of more robust session management policies that align with industry standards such as NIST SP 800-63B for authentication and trust services. Additionally, organizations should consider implementing additional validation mechanisms such as IP address tracking and device fingerprinting to prevent unauthorized reuse of reset tokens and maintain comprehensive logging of all authentication events for forensic analysis purposes.