CVE-2018-8604 in Exchange Server
Summary
by MITRE
A tampering vulnerability exists when Microsoft Exchange Server fails to properly handle profile data, aka "Microsoft Exchange Server Tampering Vulnerability." This affects Microsoft Exchange Server.
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Analysis
by VulDB Data Team • 04/19/2020
The vulnerability identified as CVE-2018-8604 represents a significant security flaw within Microsoft Exchange Server that stems from improper handling of profile data, creating a tampering vulnerability that could be exploited by malicious actors. This issue specifically affects Microsoft Exchange Server versions 2016 and 2019, where the server fails to adequately validate and sanitize profile information during processing. The flaw allows attackers to manipulate profile data in ways that could lead to unauthorized access, privilege escalation, or data corruption within the email server environment.
This vulnerability falls under the category of improper input validation and data handling as classified by CWE-20, which specifically addresses "Improper Input Validation" in software systems. The technical implementation flaw occurs when Exchange Server processes user profile information without sufficient sanitization measures, creating opportunities for attackers to inject malicious data or manipulate existing profile attributes. The vulnerability is particularly concerning because profile data in Exchange Server often contains sensitive user information, authentication tokens, and access permissions that could be leveraged for further attacks.
The operational impact of CVE-2018-8604 extends beyond simple data manipulation, as it could enable attackers to gain unauthorized access to email accounts, modify user permissions, or even escalate privileges within the Exchange environment. Attackers could potentially exploit this vulnerability to create backdoors, modify user profiles to gain persistent access, or manipulate authentication data to impersonate legitimate users. The tampering capability could also be used to corrupt email data or disrupt service availability, making this a critical concern for organizations relying on Exchange Server for email communications.
From an adversary perspective, this vulnerability aligns with several tactics described in the MITRE ATT&CK framework, particularly those related to privilege escalation and persistence. The attack chain would typically involve initial access through other means, followed by exploitation of this profile tampering vulnerability to establish more stable access or escalate privileges. Security professionals should consider this vulnerability as part of a broader attack surface that could be exploited in conjunction with other weaknesses in the Exchange Server infrastructure.
Organizations should implement immediate mitigations including applying the relevant Microsoft security updates, implementing network segmentation to limit access to Exchange Server components, and monitoring for unusual profile modification activities. Additionally, regular security assessments should verify proper input validation mechanisms are in place, and administrative privileges should be strictly controlled through proper access control lists and least privilege principles. The vulnerability underscores the importance of maintaining up-to-date security patches and implementing robust input validation controls across all server applications to prevent similar tampering scenarios.