CVE-2018-12242 in Messaging Gateway
Summary
by MITRE
The Symantec Messaging Gateway product prior to 10.6.6 may be susceptible to an authentication bypass exploit, which is a type of issue that can allow attackers to potentially circumvent security mechanisms currently in place and gain access to the system or network.
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Analysis
by VulDB Data Team • 03/25/2020
The Symantec Messaging Gateway vulnerability identified as CVE-2018-12242 represents a critical authentication bypass flaw that affects versions prior to 10.6.6. This vulnerability resides within the messaging gateway's authentication mechanism, creating a pathway for malicious actors to circumvent established security controls. The issue stems from improper validation of authentication tokens and session management processes that fail to adequately verify user credentials before granting access to system resources. Such a flaw fundamentally undermines the security architecture of the messaging gateway, as it allows unauthorized individuals to potentially gain administrative privileges or access to sensitive email infrastructure without proper authorization. The vulnerability's classification aligns with CWE-287 which addresses improper authentication issues, specifically focusing on authentication bypass scenarios that permit unauthorized access to protected resources.
The technical implementation of this vulnerability involves weaknesses in the authentication flow where session tokens are not properly validated or where authentication state is not adequately maintained across different request contexts. Attackers can exploit this flaw by crafting specific requests that bypass the normal authentication checks, potentially allowing them to establish sessions with elevated privileges or access restricted administrative functions. The vulnerability may manifest through manipulated HTTP headers, session identifiers, or authentication parameters that the system accepts without proper verification. This type of authentication bypass can be particularly dangerous in email gateway environments where the messaging infrastructure serves as a critical communication hub for enterprise networks. The flaw essentially creates a backdoor mechanism that allows attackers to authenticate as legitimate users or system administrators without possessing valid credentials, directly violating fundamental security principles of access control and identity verification.
The operational impact of CVE-2018-12242 extends beyond simple unauthorized access to encompass potential data breaches, email spoofing, and complete compromise of the messaging infrastructure. Organizations utilizing affected Symantec Messaging Gateway versions face significant risk of email content interception, unauthorized email forwarding, and potential use of the gateway as a launch point for broader network attacks. The vulnerability could enable attackers to read, modify, or delete email messages, access email archives, and potentially use the compromised gateway to send spam or phishing emails. From an ATT&CK framework perspective, this vulnerability maps to techniques involving credential access and privilege escalation, allowing adversaries to establish persistent access to email infrastructure and potentially leverage the compromised gateway for lateral movement within the network. The impact is particularly severe for organizations that rely heavily on email as their primary communication channel, as the compromise of the messaging gateway can disrupt business operations and expose sensitive corporate communications.
Organizations should immediately upgrade to Symantec Messaging Gateway version 10.6.6 or later to remediate this vulnerability, as this represents the official patch addressing the authentication bypass flaw. Security teams should also implement network segmentation and monitoring of authentication-related traffic to detect potential exploitation attempts. Additional mitigations include enforcing strong access controls, implementing multi-factor authentication where possible, and conducting regular security assessments of the messaging infrastructure. The vulnerability demonstrates the critical importance of maintaining current security patches and the potential consequences of running outdated software versions. Organizations should also review their incident response procedures to ensure readiness for potential exploitation of this type of authentication bypass vulnerability. Compliance with security standards such as NIST SP 800-53 and ISO 27001 becomes particularly important when addressing such vulnerabilities, as they require proper authentication mechanisms and regular security updates to maintain acceptable risk levels.