Microsoft Exchange Server URI Validator DownloadDataFromOfficeMarketPlace server-side request forgery

Summaryinfo

A vulnerability classified as critical has been found in Microsoft Exchange Server. The affected element is the function DownloadDataFromOfficeMarketPlace of the component URI Validator. Performing a manipulation results in server-side request forgery. Remote exploitation of the attack is possible. No exploit is available.

Detailsinfo

A vulnerability was found in Microsoft Exchange Server (Groupware Software) (version now known). It has been classified as critical. This affects the function DownloadDataFromOfficeMarketPlace of the component URI Validator. The manipulation with an unknown input 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 weakness was published 11/07/2023 as ZDI-23-1580. It is possible to read the advisory at zerodayinitiative.com. 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 11/07/2023). A Microsoft spokesperson responded to BleepingComputer's request for a comment with the statement, that they've reviewed these reports and have found that they have either already been addressed, or do not meet the bar for immediate servicing under the severity classification guidelines and they will evaluate addressing them in future product versions and updates as appropriate.

Microsoft claims that the technique described requires an attacker to have prior access to email credentials, and no evidence was presented that it can be leveraged to access sensitive customer information.

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

Further details are available at bleepingcomputer.com. Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

Type

• Groupware Software

Vendor

• Microsoft

Name

• Exchange Server

License

• commercial

Website

• Vendor: https://www.microsoft.com/

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