CVE-2023-5028 in TEWA-800G
Summary
by MITRE • 09/17/2023
A vulnerability, which was classified as problematic, has been found in China Unicom TEWA-800G 4.16L.04_CT2015_Yueme. Affected by this issue is some unknown functionality. The manipulation leads to information exposure through debug log file. It is possible to launch the attack on the physical device. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. VDB-239870 is the identifier assigned to this vulnerability.
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Analysis
by VulDB Data Team • 06/18/2025
The vulnerability identified as CVE-2023-5028 affects the China Unicom TEWA-800G 4.16L.04_CT2015_Yueme device firmware, representing a significant security weakness that exposes sensitive information through debug log files. This issue falls under the category of information exposure vulnerabilities, where unauthorized access to debug logs can reveal confidential data that should remain protected within the system. The vulnerability is classified as problematic due to its potential to compromise device security and data integrity. The affected functionality appears to be related to the device's logging mechanisms, where debug information is not properly sanitized or restricted, creating an information exposure risk. The vulnerability's severity is amplified by the fact that it can be exploited on the physical device itself, indicating that attackers do not require network-based access to compromise the system.
The technical flaw manifests in the improper handling of debug logging within the device's firmware, where sensitive information is written to log files without adequate access controls or data sanitization measures. This vulnerability can be exploited through physical access to the device, making it particularly concerning for environments where physical security is not adequately maintained. The attack complexity is rated as high, suggesting that exploitation requires significant technical expertise and resources, yet the fact that public exploitation methods have been disclosed indicates that determined attackers may be able to leverage this weakness. The vulnerability's classification as difficult to exploit does not diminish its potential impact, as even complex attacks can succeed when proper security measures are not in place. The disclosure of exploitation methods in VDB-239870 further compounds the risk, as it provides attackers with specific techniques to target this vulnerability.
The operational impact of CVE-2023-5028 extends beyond simple information disclosure, as debug logs may contain sensitive data including device identifiers, network configurations, authentication credentials, or other system information that could be leveraged for further attacks. This vulnerability creates potential entry points for attackers seeking to escalate privileges or gain deeper access to network infrastructure. The physical device attack vector means that unauthorized personnel with access to the device can exploit this vulnerability without requiring network connectivity, making it particularly dangerous in environments where physical security controls are insufficient. Organizations using affected devices may face increased risk of targeted attacks, credential theft, or network reconnaissance activities that could compromise broader network security. The vulnerability affects not only the immediate device but potentially the entire network infrastructure that relies on these devices for operations.
Mitigation strategies should focus on implementing proper access controls for debug log files, ensuring that sensitive information is not stored in plaintext within logs, and establishing regular log review processes to identify potential information exposure. Device administrators should implement physical security measures to prevent unauthorized access to affected hardware, including secure storage and access controls for network equipment. The firmware should be updated with patches that address the logging mechanism vulnerabilities, and organizations should consider disabling debug logging in production environments unless absolutely necessary. Network segmentation and monitoring should be enhanced to detect unusual access patterns or potential exploitation attempts. Security professionals should also consider implementing automated log analysis tools that can identify sensitive information within log files and trigger alerts when exposure occurs. According to CWE classification, this vulnerability aligns with CWE-200 Information Exposure, while the ATT&CK framework would categorize this under T1082 System Information Discovery and potentially T1566 Phishing, as the information exposure could enable more sophisticated social engineering attacks. Regular security assessments and vulnerability scanning should be conducted to identify similar weaknesses in other network infrastructure components.