CVE-2018-9327 in Etherpad
Summary
by MITRE
Etherpad 1.5.x and 1.6.x before 1.6.4 allows an attacker to execute arbitrary code on the server. The instance has to be configured to use a document database (DirtyDB, CouchDB, MongoDB, or RethinkDB).
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Analysis
by VulDB Data Team • 01/23/2020
The vulnerability identified as CVE-2018-9327 represents a critical remote code execution flaw affecting Etherpad versions 1.5.x and 1.6.x prior to 1.6.4. This vulnerability specifically targets installations that utilize document database configurations including DirtyDB, CouchDB, MongoDB, or RethinkDB. The flaw stems from inadequate input validation and sanitization mechanisms within the application's database interaction components, creating a pathway for malicious actors to inject and execute arbitrary code on the affected server systems. The vulnerability's severity is amplified by the fact that it requires no authentication to exploit, making it particularly dangerous in environments where Etherpad instances are publicly accessible or deployed without proper network segmentation.
The technical implementation of this vulnerability occurs through improper handling of user-supplied data within the database interaction layer of Etherpad. When the application processes data through supported document databases, it fails to properly sanitize or validate input parameters that are subsequently used in database operations. This allows attackers to craft malicious payloads that can manipulate database queries or injection points to execute arbitrary commands on the underlying server. The vulnerability operates at the intersection of insecure database handling and code execution, which aligns with CWE-94 (Improper Control of Generation of Code) and CWE-77 (Improper Neutralization of Special Elements used in a Command). The attack vector typically involves manipulating database connection parameters or query structures that are then processed without adequate security checks.
The operational impact of this vulnerability extends beyond simple data compromise to full system compromise, as successful exploitation grants attackers complete control over the affected Etherpad server. This includes the ability to install malicious software, access all stored data, modify or delete content, and potentially use the compromised system as a pivot point for further attacks within the network infrastructure. The vulnerability affects organizations that rely on Etherpad for collaborative document editing, particularly those running versions within the affected range with database configurations. The risk is particularly elevated for deployments in cloud environments or shared hosting scenarios where multiple users may have access to the same server infrastructure. Organizations using Etherpad for sensitive collaborative work or those hosting multiple users may face significant operational disruption and security breaches.
Organizations should immediately implement mitigation strategies including upgrading to Etherpad version 1.6.4 or later, which contains the necessary patches to address this vulnerability. Network segmentation and access controls should be implemented to limit exposure of Etherpad instances to untrusted networks. Additionally, organizations should conduct comprehensive vulnerability assessments to identify all instances running affected versions and ensure proper database configuration practices are implemented. The remediation process should include disabling unnecessary database connection features and implementing strict input validation for all user-supplied data. Security monitoring should be enhanced to detect suspicious database activity patterns that may indicate exploitation attempts. This vulnerability highlights the importance of maintaining current software versions and implementing proper security controls around database interactions, as outlined in the mitre attack framework's methodology for command and control operations and privilege escalation techniques.