CVE-2018-11741 in Univerge Sv9100 WebPro
Summary
by MITRE
NEC Univerge Sv9100 WebPro 6.00.00 devices have Predictable Session IDs that result in Account Information Disclosure via Home.htm?sessionId=#####&GOTO(8) URIs.
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Analysis
by VulDB Data Team • 07/03/2024
The vulnerability identified as CVE-2018-11741 affects NEC Univerge Sv9100 WebPro 6.00.00 devices, presenting a critical security flaw related to session management and predictable identifier generation. This issue manifests through the web interface where session identifiers are generated using predictable patterns, allowing unauthorized users to exploit the system through crafted URI requests that include specific session ID values.
The technical flaw stems from the implementation of weak random number generation or deterministic algorithms in the session ID creation process. When users access the web interface through URIs such as Home.htm?sessionId=#####&GOTO(8), the system's predictable session ID generation allows attackers to guess valid session tokens and potentially gain unauthorized access to user accounts and sensitive information. This vulnerability specifically impacts the authentication and authorization mechanisms of the device's web management interface.
The operational impact of this vulnerability is significant as it enables account information disclosure and unauthorized access to administrative functions. An attacker who can predict session IDs can impersonate legitimate users, access confidential account data, and potentially escalate privileges within the system. The vulnerability affects the integrity and confidentiality of the device's web-based management interface, compromising the overall security posture of the network infrastructure.
This vulnerability aligns with CWE-330 Use of Insufficiently Random Values, which addresses weaknesses in random number generation and predictable identifier creation. The attack pattern corresponds to techniques described in the MITRE ATT&CK framework under credential access and privilege escalation phases, where adversaries exploit predictable identifiers to gain unauthorized system access. The predictable session ID generation represents a fundamental flaw in the authentication system's design and implementation.
Mitigation strategies should focus on implementing strong cryptographic random number generation for session ID creation, ensuring that session identifiers are sufficiently long and unpredictable. Organizations should immediately update to patched versions of the NEC Univerge Sv9100 software, implement proper session management controls, and consider network segmentation to limit access to the device's web interface. Additionally, monitoring for suspicious session ID patterns and implementing rate limiting on authentication attempts can help detect and prevent exploitation of this vulnerability. The device configuration should also enforce secure session handling practices including proper session timeout mechanisms and secure cookie attributes to prevent session hijacking attacks.