CVE-2017-6686 in Ultra Services Framework Element Manager
Summary
by MITRE
A vulnerability in Cisco Ultra Services Framework Element Manager could allow an authenticated, remote attacker with access to the management network to log in as an admin or oper user of the affected device, aka an Insecure Default Credentials Vulnerability. More Information: CSCvc76699. Known Affected Releases: 21.0.0.
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Analysis
by VulDB Data Team • 12/27/2020
The vulnerability identified as CVE-2017-6686 represents a critical insecure default credentials issue within Cisco Ultra Services Framework Element Manager version 21.0.0. This flaw exists in the management interface of the affected device, creating a pathway for authenticated remote attackers who already have network access to escalate their privileges and assume administrative or operational roles. The vulnerability stems from the system's reliance on default credentials that are either weak, predictable, or not properly secured, allowing unauthorized access to privileged functions without requiring additional authentication mechanisms. The affected Cisco Ultra Services Framework Element Manager operates within enterprise network environments where management access is typically restricted to authorized personnel, making this vulnerability particularly concerning for organizations relying on these services for critical infrastructure operations.
This technical flaw specifically exploits the authentication mechanism within the management interface, where default administrative accounts remain enabled and accessible without proper credential management. The vulnerability allows an attacker who has gained access to the management network to leverage these default credentials to log in as either admin or oper users, effectively bypassing normal authentication procedures. The insecure default credentials typically include hardcoded usernames and passwords that are well-documented within vendor documentation or readily available through public sources, making them particularly vulnerable to exploitation. The flaw manifests when the system does not enforce proper credential rotation or account management policies, leaving default administrative accounts active and accessible. This type of vulnerability falls under CWE-798, which specifically addresses the use of hard-coded credentials, and represents a fundamental weakness in the principle of least privilege that should be enforced in all network management systems.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it provides attackers with elevated privileges that could enable them to modify system configurations, access sensitive data, or disrupt service availability. An attacker with administrative access could potentially modify firewall rules, alter network policies, disable security features, or exfiltrate confidential information from the managed network elements. The remote nature of the attack means that an attacker does not require physical access to the device, significantly increasing the attack surface and potential impact. Organizations using the affected Cisco Ultra Services Framework Element Manager may experience unauthorized modifications to network configurations, leading to potential service disruptions, data breaches, or compromised network security posture. The vulnerability also increases the risk of lateral movement within the network, as attackers could use the elevated privileges to access other connected systems or services.
Mitigation strategies for CVE-2017-6686 should focus on immediate credential management and access control measures. Organizations must ensure that default administrative accounts are immediately disabled or have their credentials changed to strong, unique passwords that are not based on default values. The recommended approach includes implementing robust password policies that enforce complexity requirements, regular credential rotation, and multi-factor authentication where possible. Network segmentation should be implemented to limit access to management interfaces, ensuring that only authorized personnel can reach the management network. The affected system should be updated to the latest firmware version that addresses this vulnerability, as Cisco has likely released patches or updates to resolve the insecure default credential issue. Security monitoring should be enhanced to detect unauthorized access attempts or privilege escalation activities, with proper logging and alerting mechanisms in place. According to ATT&CK framework, this vulnerability maps to T1078 which covers valid accounts and T1068 which covers exploit for privilege escalation, making it a critical target for both defensive and offensive security operations. Organizations should also conduct thorough inventory assessments to identify all instances of the affected software and ensure comprehensive remediation across their entire network infrastructure.