CVE-2019-17414 in Vino
Summary
by MITRE
tinylcy Vino through 2017-12-15 allows remote attackers to cause a denial of service ("vn_get_string error: Resource temporarily unavailable" error and daemon crash) via a long URL.
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Analysis
by VulDB Data Team • 01/07/2024
The vulnerability identified as CVE-2019-17414 affects the tinylcy Vino software version released on or before December 15, 2017, representing a critical denial of service flaw that can be exploited remotely by attackers. This vulnerability manifests through improper handling of excessively long Uniform Resource Locators within the application's processing mechanisms, specifically impacting the vn_get_string function which is responsible for string operations within the software's daemon process. The flaw stems from inadequate input validation and buffer management practices that fail to properly handle extended URL parameters, leading to resource exhaustion and subsequent daemon crashes. The error message "vn_get_string error: Resource temporarily unavailable" indicates that the system has encountered a temporary resource constraint during string processing operations, ultimately resulting in complete service disruption.
From a technical perspective, this vulnerability demonstrates characteristics consistent with CWE-122, which addresses buffer overflow conditions, and CWE-400, relating to resource exhaustion vulnerabilities. The flaw operates by exploiting the software's inability to properly validate input length limits during URL parsing operations, causing the daemon process to consume excessive system resources or encounter memory allocation failures. The attack vector requires only a remote connection to the vulnerable service and the submission of a specially crafted long URL, making it particularly dangerous as it can be exploited without authentication or specialized privileges. The daemon crash represents a complete service outage that can be repeatedly triggered, rendering the affected system unusable until manual intervention or system restart occurs.
The operational impact of this vulnerability extends beyond simple service disruption to encompass potential business continuity issues and security posture degradation. Organizations relying on affected versions of tinylcy Vino face risks of unauthorized service interruption, which could be leveraged as part of broader attack campaigns targeting availability. The vulnerability's remote exploitability aligns with ATT&CK technique T1499.004, which covers network denial of service attacks, and T1566.002, relating to spearphishing attacks that may involve initial access through service exploitation. System administrators must consider that this vulnerability could be combined with other attack vectors to create more sophisticated compromise scenarios, as the service disruption could mask other malicious activities or serve as a distraction during more complex attacks.
Mitigation strategies should prioritize immediate patching of affected systems to the latest available versions of tinylcy Vino that contain proper input validation and resource management fixes. Network-level protections such as rate limiting and URL length restrictions can provide temporary defenses while patches are deployed, though these measures may impact legitimate user functionality. The implementation of proper input validation controls, including maximum length enforcement for URL parameters, should be integrated into all application components handling user-supplied data. Additionally, monitoring systems should be configured to detect unusual daemon crash patterns or resource exhaustion events that may indicate exploitation attempts, with alerts configured for rapid response to potential attacks. Organizations should also conduct thorough vulnerability assessments of their entire software inventory to identify other potentially affected systems that may share similar architectural flaws.