Horizon Alert
Summary of the vulnerability and why it matters
This advisory concerns a vulnerability in wolfSSH's key exchange process that could allow attackers to obtain user passwords or bypass authentication. While specific attacks on server applications are not detailed, the underlying flaw exists in both client and server code. The primary concern is confirming if your organization utilizes affected wolfSSH client applications and understanding potential exposure.
- Passwords leaked, signatures faked, authentication bypassed.
- Affects wolfSSH client applications; server applications may also be impacted.
- Assess exposure and update affected wolfSSH client applications.
Attack Path
How an attacker could exploit the issue
An attacker could exploit this by tricking a client application into connecting to a malicious server, leading to the exposure of sensitive authentication information or the bypassing of user authentication. This could occur if the client application uses a vulnerable version of the wolfSSH library.
- Client connects to a malicious server.
- Vulnerable key exchange state machine.
- Leaked credentials or bypassed authentication.
Live Threat
Current exploitation, exposure, and threat context
When supported by the advisory, wolfSSH client applications could be tricked into leaking a user's password in clear text, or into skipping user authentication entirely. This could also affect wolfSSH server applications, although specific attacks are not detailed.
- Client passwords could be exposed.
- Attackers may trick clients during key exchange.
- Authentication bypass and data leakage may occur.
Operational Fix
Recommended remediation, mitigation, and detection steps
The wolfSSH library's key exchange mechanism is vulnerable, potentially leading to password leakage or authentication bypass on affected client applications. Given that wolfSSH is a library, responsibility likely falls to the application owners integrating it, with support from infrastructure or platform teams for remediation. The first step is to identify all applications using this library, assess their exposure and criticality, and then coordinate updates with the vendor or apply necessary patches.
- Application owners and platform teams.
- Confirm deployed wolfSSH instances and reachability.
- Plan and execute updates or patching.
