CVE-2024-25734 in Apollo VX20
Summary
by MITRE • 03/27/2024
An issue was discovered on WyreStorm Apollo VX20 devices before 1.3.58. The TELNET service prompts for a password only after a valid username is entered, which might make it easier for remote attackers to enumerate user accounts.
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Analysis
by VulDB Data Team • 03/18/2025
The vulnerability identified as CVE-2024-25734 affects WyreStorm Apollo VX20 devices running firmware versions prior to 1.3.58, representing a significant security weakness in the device's authentication mechanism. This issue resides within the telnet service implementation and demonstrates a flawed authentication flow that inadvertently exposes user account information to potential attackers. The vulnerability creates a predictable authentication pattern that violates fundamental security principles for access control systems.
The technical flaw manifests in the telnet service's credential validation process where the system only requires password input after a valid username has been submitted. This design allows attackers to perform user enumeration by systematically testing usernames and observing the service's response behavior. When an attacker enters a valid username, they are prompted for a password, whereas entering an invalid username results in immediate rejection without password prompt. This differential response behavior creates an information disclosure vulnerability that directly maps to CWE-200, which addresses the improper exposure of sensitive information.
The operational impact of this vulnerability extends beyond simple account enumeration, as it provides attackers with a foundation for more sophisticated attack vectors including brute force password guessing, credential stuffing attacks, and social engineering operations. The vulnerability affects the device's ability to maintain secure access control, potentially allowing unauthorized individuals to gain administrative privileges. This weakness is particularly concerning for network infrastructure devices that may be exposed to untrusted networks, as it creates an attack surface that can be exploited without prior knowledge of valid usernames.
The vulnerability aligns with several ATT&CK framework techniques including T1078 for valid accounts and T1110 for credential access, as attackers can leverage the enumeration capability to target specific accounts for further exploitation. Organizations using WyreStorm Apollo VX20 devices should immediately implement firmware updates to version 1.3.58 or later, which addresses this authentication flaw. Additional mitigations should include disabling telnet services where possible and implementing network segmentation to limit exposure of these devices to untrusted networks. The recommended approach also includes implementing strong authentication mechanisms such as SSH with key-based authentication and enforcing account lockout policies to prevent successful brute force attacks against valid accounts.