CVE-2020-9733 in Experience Manager
Summary
by MITRE
An AEM java servlet in AEM versions 6.5.5.0 (and below) and 6.4.8.1 (and below) executes with the permissions of a high privileged service user. If exploited, this could lead to read-only access to sensitive data in an AEM repository.
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Analysis
by VulDB Data Team • 11/13/2020
The vulnerability identified as CVE-2020-9733 represents a critical privilege escalation issue within Adobe Experience Manager platforms. This flaw exists in AEM versions 6.5.5.0 and earlier, as well as 6.4.8.1 and earlier releases, where a specific java servlet operates with elevated service user permissions. The vulnerability stems from improper access control mechanisms that allow unauthorized execution of servlets with high-privilege credentials. This architectural weakness creates a pathway for attackers to exploit the system's trust model and gain unauthorized access to sensitive repository data.
The technical implementation of this vulnerability involves a java servlet that executes with service user privileges, which typically possess extensive access rights within the AEM system. When an attacker can invoke this servlet through a crafted request, they effectively inherit the permissions of the privileged service user. This design flaw allows for read-only access to the underlying AEM repository, potentially exposing confidential content, configuration data, and user information. The vulnerability operates at the application layer and requires minimal privileges to exploit, making it particularly dangerous in environments where AEM serves as a content management platform for sensitive enterprise data.
From an operational perspective, the impact of this vulnerability extends beyond simple data exposure. The read-only access capability enables attackers to perform reconnaissance activities, mapping out repository structures, identifying sensitive content, and gathering intelligence for further attacks. This vulnerability aligns with CWE-284 (Improper Access Control) and represents a classic example of privilege escalation where a lower-privilege user can gain elevated system access. The attack vector typically involves sending specially crafted HTTP requests to the vulnerable servlet endpoint, which then executes with elevated permissions and returns the requested repository data to the attacker.
Organizations utilizing affected AEM versions face significant security risks including potential data breaches, intellectual property theft, and compliance violations. The vulnerability's impact is particularly severe for enterprises handling sensitive customer data, proprietary content, or regulated information. Security teams must consider this vulnerability in their risk assessment frameworks and prioritize remediation efforts. Mitigation strategies include immediate patching to the latest AEM versions, implementing network segmentation to limit access to vulnerable endpoints, and deploying web application firewalls to monitor and block suspicious servlet invocation attempts. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically leveraging service accounts and application-level access control bypasses. Organizations should also implement comprehensive monitoring solutions to detect anomalous access patterns to repository endpoints and establish incident response procedures to address potential exploitation attempts.