A vulnerability classified as critical has been found in Microsoft Exchange Server up to 2010 SP3 (Groupware Software). This affects some unknown functionality of the file /owa/auth/logon.aspx of the component Outlook Web Access. The manipulation of the argument username as part of a Parameter leads to a server-side request forgery vulnerability. CWE is classifying the issue as CWE-918. The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Rollup 18 for Microsoft Exchange Server 2010 SP3 and previous versions has an SSRF vulnerability via the username parameter in /owa/auth/logon.aspx in the OWA (Outlook Web Access) login page.

The bug was discovered 12/13/2018. The weakness was released 09/21/2018 as not defined mailinglist post (Bugtraq). It is possible to read the advisory at seclists.org. This vulnerability is uniquely identified as CVE-2018-16793 since 09/10/2018. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 05/17/2023).

By approaching the search of inurl:owa/auth/logon.aspx it is possible to find vulnerable targets with Google Hacking.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Productinfo

Type

• Groupware Software

Vendor

• Microsoft

Name

• Exchange Server

Version

• 2010 SP3

License

• commercial

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