CVE-2018-15355 in 24F2XG
Summary
by MITRE
Usage of SSLv2 and SSLv3 leads to transmitted data decryption in Kraftway 24F2XG Router firmware 3.5.30.1118.
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Analysis
by VulDB Data Team • 03/16/2020
The vulnerability identified as CVE-2018-15355 affects the Kraftway 24F2XG Router firmware version 3.5.30.1118 and represents a critical security flaw involving the use of deprecated SSL protocols. This issue stems from the router's implementation of SSL version 2.0 and SSL version 3.0 protocols which are inherently weak and susceptible to various cryptographic attacks. The vulnerability falls under the category of cryptographic weakness as defined by CWE-327, specifically targeting the use of insecure cryptographic algorithms and protocols that have been deprecated due to known security flaws.
The technical implementation flaw manifests in the router's network communication stack where it continues to support and enable SSLv2 and SSLv3 protocols despite their well-documented vulnerabilities. These protocols suffer from fundamental design weaknesses including lack of proper encryption key derivation functions, susceptibility to man-in-the-middle attacks, and known cryptographic weaknesses that allow attackers to potentially decrypt transmitted data. The specific exposure occurs during the initial handshake process where the router accepts connections using these outdated protocols, creating an attack surface that adversaries can exploit to intercept and decrypt sensitive information passing through the device.
From an operational perspective, this vulnerability poses significant risks to network security as it allows attackers to potentially intercept and decrypt data transmitted through the router. The impact extends beyond simple data interception to include potential credential theft, session hijacking, and unauthorized access to network resources. Attackers can leverage known exploits such as POODLE (Padding Oracle On Downgraded Legacy Encryption) attacks that specifically target SSLv3 implementations, enabling them to decrypt communications between clients and the router. This weakness essentially undermines the entire security posture of the network by providing an easily exploitable path for unauthorized data access.
The vulnerability demonstrates a clear failure in secure configuration management and protocol implementation within the router's firmware. According to ATT&CK framework, this represents a technique under T1071.004 for application layer protocol usage and T1566 for credential access through network sniffing and interception. Organizations using affected routers face potential exposure to advanced persistent threats and credential harvesting attacks that could lead to complete network compromise. The remediation requires immediate firmware updates from the vendor to disable SSLv2 and SSLv3 protocols and enforce the use of modern TLS versions. Additionally, network administrators should implement proper monitoring to detect any continued attempts to use deprecated protocols and consider network segmentation to limit the impact of potential exploitation. The vulnerability highlights the critical importance of regularly updating network device firmware and maintaining current security practices to avoid falling victim to known cryptographic weaknesses that have been addressed through industry standards and best practices.