CVE-2017-16189 in sly07
Summary
by MITRE
sly07 is an API for censoring text. sly07 is vulnerable to a directory traversal issue, giving an attacker access to the filesystem by placing "../" in the url.
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Analysis
by VulDB Data Team • 02/16/2020
The sly07 API presents a critical directory traversal vulnerability that fundamentally compromises the security boundaries of the application. This vulnerability stems from insufficient input validation within the URL processing mechanism, allowing malicious actors to manipulate file paths through crafted requests containing "../" sequences. The flaw represents a classic path traversal attack vector that has been documented across numerous applications and systems, with the Common Weakness Enumeration cataloging this issue under CWE-22, which specifically addresses improper limitation of a pathname to a restricted directory. When an attacker constructs a URL with directory traversal sequences, the application fails to properly sanitize or validate the input before processing file operations, thereby enabling unauthorized access to arbitrary files on the underlying filesystem.
The operational impact of this vulnerability extends far beyond simple information disclosure, as it provides attackers with the ability to read sensitive system files, configuration data, and potentially execute malicious code through the exposure of critical application components. The vulnerability exists at the application layer where user-supplied input directly influences file system operations without adequate sanitization or access control measures. This weakness allows adversaries to navigate beyond the intended application directory structure and access files that should remain protected, including but not limited to application configuration files, database credentials, system logs, and potentially system binaries. The attack surface is particularly concerning given that this vulnerability can be exploited through simple URL manipulation without requiring authentication or specialized tools, making it a prime target for automated exploitation campaigns.
Security practitioners should recognize this vulnerability as a direct violation of the principle of least privilege and proper input validation. The ATT&CK framework categorizes this type of vulnerability under the technique of "Path Traversal" within the broader category of privilege escalation and information gathering. Organizations implementing sly07 or similar text censoring APIs must understand that this flaw creates a persistent security risk that can be exploited by both internal and external threat actors. The vulnerability's exploitation potential aligns with the MITRE ATT&CK matrix's T1083 technique for discovering files and directories, as attackers can systematically enumerate system resources through the directory traversal mechanism. Remediation efforts should focus on implementing proper input validation, canonicalizing file paths, and enforcing strict access controls that prevent directory traversal attempts from succeeding. Additionally, organizations should consider implementing web application firewalls, input sanitization, and regular security assessments to prevent similar vulnerabilities from being introduced into future application releases. The vulnerability underscores the importance of following secure coding practices and the necessity of validating all user-supplied input before processing, particularly in applications that handle file system operations.