CVE-2018-1000830 in XR3Player
Summary
by MITRE
XR3Player version <= V3.124 contains a XML External Entity (XXE) vulnerability in Playlist parser that can result in Disclosure of confidential data, denial of service, SSRF, port scanning.
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Analysis
by VulDB Data Team • 04/22/2020
The CVE-2018-1000830 vulnerability represents a critical XML External Entity flaw discovered in XR3Player version 3.124 and earlier, fundamentally compromising the security posture of media playback applications. This vulnerability exists within the playlist parser component that processes media playlist files, specifically targeting the XML parsing functionality used to handle various media formats. The flaw enables attackers to manipulate the XML processing behavior through crafted playlist files, creating a pathway for unauthorized data access and system disruption.
The technical implementation of this XXE vulnerability stems from insufficient input validation and unsafe XML parsing practices within the application's playlist handling mechanism. When XR3Player processes a maliciously crafted playlist file containing external entity declarations, the parser inadvertently resolves these external references, potentially leading to unauthorized data disclosure. This occurs because the application fails to properly configure XML parsers to disable external entity resolution, allowing attackers to specify arbitrary external resources that can be accessed during the parsing process.
The operational impact of this vulnerability extends beyond simple data exposure, encompassing multiple attack vectors that can severely compromise system integrity and availability. Attackers can leverage this vulnerability to perform server-side request forgery attacks by directing the parser to access internal network resources, effectively enabling port scanning and internal network reconnaissance. The vulnerability also facilitates denial of service conditions when malformed XML entities are processed, potentially causing application crashes or resource exhaustion. Additionally, the disclosure of confidential data through this vector can expose sensitive information stored on the target system.
Security professionals should consider this vulnerability in the context of the CWE-611 weakness classification, which specifically addresses improper restriction of XML external entities, and its alignment with ATT&CK technique T1059.007 for XML External Entity Processing. The vulnerability demonstrates how media playback applications can become attack vectors for broader network compromise, particularly in enterprise environments where such players might be used to process untrusted media content from external sources.
Mitigation strategies should focus on implementing proper XML parser configuration to disable external entity resolution and DTD processing entirely. Organizations must update XR3Player to versions that address this vulnerability, while also implementing network segmentation and access controls to limit exposure. Input validation mechanisms should be strengthened to sanitize all playlist files before processing, and security awareness training should emphasize the dangers of processing untrusted media content. Additionally, network monitoring solutions should be configured to detect suspicious XML parsing activities that might indicate exploitation attempts. The vulnerability serves as a reminder of the critical importance of secure coding practices in multimedia applications and the necessity of proper XML processing security controls in all software components that handle external data formats.