CVE-2003-0904: Infoleak
Microsoft Exchange 2003 and Outlook Web Access (OWA), when configured to use NTLM authentication, does not properly reuse HTTP connections, which can cause OWA users to view mailboxes of other users when Kerberos has been disabled as an authentication method for IIS 6.0, e.g. when SharePoint Services 2.0 is installed.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Configuration
Re-enable Kerberos (Integrated Windows Authentication) as an authentication method in IIS 6.0 (do not disable Kerberos). This prevents OWA/Exchange from being forced to use NTLM, which can cause improper HTTP connection reuse.
IIS 6.0 Kerberos authentication = enabled - Configuration
Configure Exchange 2003/OWA to use Kerberos authentication rather than NTLM to avoid the improper HTTP connection reuse that can allow users to view other users' mailboxes.
Microsoft Exchange 2003 / Outlook Web Access (OWA) Authentication method = Use Kerberos (Integrated Windows Authentication) instead of NTLM
Event History
Frequently Asked Questions
What is the severity of CVE-2003-0904?
CVE-2003-0904 is rated as a moderate severity vulnerability as it allows improper access to user mailboxes.
How do I fix CVE-2003-0904?
To fix CVE-2003-0904, ensure that Kerberos authentication is enabled and configure proper IIS settings.
What systems are affected by CVE-2003-0904?
CVE-2003-0904 affects Microsoft Exchange Server 2003, Outlook Web Access, and certain versions of Windows Server 2003.
What is the impact of CVE-2003-0904?
The impact of CVE-2003-0904 includes the potential for unauthorized users to access or view mailboxes of other users.
Is there a workaround for CVE-2003-0904?
A possible workaround for CVE-2003-0904 is to disable NTLM authentication and exclusively utilize Kerberos for authentication.