CVE-2025-20185 in Secure Email
Summary
by MITRE • 02/05/2025
A vulnerability in the implementation of the remote access functionality of Cisco AsyncOS Software for Cisco Secure Email and Web Manager, Cisco Secure Email Gateway, and Cisco Secure Web Appliance could allow an authenticated, local attacker to elevate privileges to root. The attacker must authenticate with valid administrator credentials.
This vulnerability is due to an architectural flaw in the password generation algorithm for the remote access functionality. An attacker could exploit this vulnerability by generating a temporary password for the service account. A successful exploit could allow the attacker to execute arbitrary commands as root and access the underlying operating system. Note: The Security Impact Rating (SIR) for this vulnerability is Medium due to the unrestricted scope of information that is accessible to an attacker.
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Analysis
by VulDB Data Team • 08/06/2025
The vulnerability described in CVE-2025-20185 represents a critical privilege escalation flaw within Cisco's AsyncOS software implementation across multiple security appliances including Secure Email and Web Manager, Secure Email Gateway, and Secure Web Appliance. This issue stems from a fundamental architectural weakness in the password generation algorithm specifically designed for remote access functionality, creating a pathway for authenticated attackers to achieve root-level system compromise. The vulnerability requires an attacker to possess valid administrator credentials, establishing a baseline authentication requirement that aligns with common attack vectors where initial access is gained through credential compromise or insider threats.
The technical exploitation of this vulnerability occurs through the manipulation of the password generation algorithm, allowing an authenticated local attacker to generate temporary passwords for service accounts that provide elevated privileges. This flaw demonstrates poor cryptographic implementation practices and inadequate entropy generation within the system's authentication framework. The vulnerability's impact extends beyond simple privilege escalation as successful exploitation enables arbitrary command execution with root privileges, effectively providing attackers complete control over the underlying operating system. This architectural weakness creates a persistent backdoor mechanism that bypasses normal authentication controls and system security boundaries, representing a significant deviation from secure coding practices and proper access control implementation.
From an operational perspective, this vulnerability poses substantial risk to organizations relying on Cisco security appliances as they provide centralized email and web security services. The medium security impact rating reflects the unrestricted scope of information accessible to attackers who successfully exploit this flaw, though the actual operational damage can be catastrophic. Attackers with access to administrator credentials can leverage this vulnerability to establish persistent access, exfiltrate sensitive data, modify system configurations, or deploy additional malware within the network infrastructure. The vulnerability's local nature means that attackers do not require external network access or complex attack chains, making it particularly dangerous in environments where administrative access is maintained by a limited number of trusted individuals.
Organizations should implement immediate mitigations including comprehensive credential rotation for all administrator accounts, enhanced monitoring of authentication logs for suspicious password generation activities, and implementation of multi-factor authentication where possible. The vulnerability's design flaw necessitates a fundamental review of the password generation algorithm and system architecture, with recommendations to adopt industry-standard cryptographic libraries and proper entropy generation practices. Security teams should conduct thorough vulnerability assessments across all affected Cisco appliances and implement network segmentation to limit potential lateral movement if exploitation occurs. This vulnerability aligns with CWE-327 (Use of a Broken or Risky Cryptographic Algorithm) and represents a significant concern under ATT&CK framework category T1068 (Exploitation for Privilege Escalation) and T1566 (Phishing for Information) when considering the initial credential compromise required for exploitation.