CVE-2024-22318: IBM i Access Client Solutions information disclosure
IBM i Access Client Solutions (ACS) 1.1.2 through 1.1.4 and 1.1.4.3 through 1.1.9.4 is vulnerable to NT LAN Manager (NTLM) hash disclosure by an attacker modifying UNC capable paths within ACS configuration files to point to a hostile server. If NTLM is enabled, the Windows operating system will try to authenticate using the current user's session. The hostile server could capture the NTLM hash information to obtain the user's credentials. IBM X-Force ID: 279091.
Other sources
IBM i Access Client Solutions (ACS) is vulnerable to NT LAN Manager (NTLM) hash disclosure by an attacker modifying UNC capable paths within ACS configuration files to point to a hostile server. If NTLM is enabled, the Windows operating system will try to authenticate using the current user's session. The hostile server could capture the NTLM hash information to obtain the user's credentials.
— IBM
Credit
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Compensating control
Ensure NTLM authentication is not enabled on the Windows systems where ACS runs (to prevent the OS from authenticating with the current user's session to a hostile UNC server).
- Operational
If you believe ACS configuration files may have been modified to point to a hostile UNC server, review/restore the ACS configuration files to trusted values and rotate any credentials that may have been exposed (NTLM hashes can be captured by a hostile server).
Event History
Frequently Asked Questions
What is the severity of CVE-2024-22318?
CVE-2024-22318 is classified as a high severity vulnerability due to the risk of NTLM hash disclosure.
How do I fix CVE-2024-22318?
To fix CVE-2024-22318, ensure that NTLM is disabled or implement stricter access controls and configurations.
What versions of IBM i Access Client Solutions are affected by CVE-2024-22318?
CVE-2024-22318 affects IBM i Access Client Solutions versions 1.1.2 through 1.1.4 and 1.1.4.3 through 1.1.9.4.
What is the impact of CVE-2024-22318 on user credentials?
CVE-2024-22318 allows attackers to potentially disclose NTLM hashes, which can lead to credential theft.
Is there a workaround for CVE-2024-22318 if immediate patching is not possible?
A temporary workaround for CVE-2024-22318 is to disable NTLM authentication in the affected environments.