CVE-2017-11150 in Office
Summary
by MITRE
Command injection vulnerability in Document.php in Synology Office 2.2.0-1502 and 2.2.1-1506 allows remote authenticated users to execute arbitrary commands via shell metacharacters in the crafted file name of RTF documents.
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Analysis
by VulDB Data Team • 12/15/2022
The vulnerability identified as CVE-2017-11150 represents a critical command injection flaw within Synology Office's Document.php component affecting versions 2.2.0-1502 and 2.2.1-1506. This security weakness stems from inadequate input validation and sanitization mechanisms when processing RTF document file names, creating a pathway for malicious actors to execute arbitrary system commands. The vulnerability specifically targets the handling of shell metacharacters within crafted file names, allowing authenticated users to exploit this flaw remotely. The affected Synology Office platform serves as a document management and collaboration solution, making this vulnerability particularly concerning for organizations relying on its document processing capabilities.
The technical exploitation of this command injection vulnerability occurs through the manipulation of file name parameters during RTF document processing. When a user uploads or processes a specially crafted RTF document containing shell metacharacters in the file name, the Document.php script fails to properly sanitize these inputs before using them in system commands. This lack of proper input validation creates a direct execution path where attacker-controlled commands can be interpreted and executed by the underlying operating system. The vulnerability aligns with CWE-77 which specifically addresses command injection flaws, where untrusted data is incorporated into shell commands without proper sanitization. The authenticated nature of the attack means that users must already have valid credentials, but this requirement does not significantly reduce the threat level given that credential compromise can occur through various attack vectors.
The operational impact of this vulnerability extends beyond simple command execution, potentially allowing attackers to gain full system control over affected Synology Office installations. Successful exploitation could enable attackers to install malware, modify system configurations, access sensitive data, or establish persistent backdoors within the network. The remote execution capability means that attackers can leverage this vulnerability from outside the organization's network perimeter, making it particularly dangerous for remote workers or organizations with public-facing Synology Office deployments. Organizations using Synology Office for document collaboration, especially in environments with multiple users, face significant risk as this vulnerability could be exploited by both insider threats and external attackers who have obtained valid user credentials.
Mitigation strategies for CVE-2017-11150 should prioritize immediate patching of affected Synology Office versions, with administrators monitoring for official security updates from Synology. Network segmentation and access controls should be implemented to limit the potential impact of successful exploitation, while monitoring systems should be configured to detect unusual command execution patterns. The implementation of proper input validation and sanitization measures within the Document.php script would prevent the injection of shell metacharacters, aligning with ATT&CK technique T1059.001 for command and scripting interpreter. Organizations should also conduct comprehensive security assessments of their document processing workflows and consider implementing additional security controls such as file type restrictions and automated malware scanning for uploaded documents. Regular security awareness training for users can help prevent credential compromise that might lead to exploitation of this vulnerability.