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Microsoft Azure Site Recovery Privilege Escalation

High
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Synopsis

The Microsoft Azure Site Recovery suite contains a DLL hijacking flaw that allows for privilege escalation from any low privileged user to SYSTEM. 

Incorrect permissions on the service’s executable directory (E:\Program Files (x86)\Microsoft Azure Site Recovery\home\svsystems\transport\) allow new files to be created by any user. The service launched from this directory runs automatically and with SYSTEM privileges and attempts to load several DLLs from this directory. This allows for a DLL hijacking/planting attack via several libraries that are attempted to be loaded from this location when the service is launched.

Solution

New deployments of the Site Recovery utilities should not require any additional actions by end users.

Existing deployments should ensure that the Microsoft-supplied patches have been appropriately applied. In the event that these patches are unable to be applied in a timely manner, users may manually apply permissions to the affected directories as appropriate for their environment – though we still recommend applying the official patches as soon as possible.

Additional References

https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2022-33675
https://msrc-blog.microsoft.com/2022/07/12/microsoft-mitigates-azure-site-recovery-vulnerabilities/

Disclosure Timeline

April 8, 2022 - Tenable discloses to vendor. Automated acknowledgment.
April 19, 2022 - Tenable requests status update.
April 28, 2022 - Tenable requests status update via MSRC email due to lack of meaningful responses in researcher portal.
May 2, 2022 - MSRC requests clarification. Tenable provides clarification.
May 13, 2022 - MSRC requests clarification. Tenable provides clarification.
May 23, 2022 - MSRC confirms vulnerable behavior and sends to develop stage.
June 8, 2022 - Tenable requests status update.
June 15, 2022 - MSRC provides status update.
June 15, 2022 - Tenable acknowledges and requests more information.
June 21, 2022 - MSRC provides status update and requests disclosure extension.
June 21, 2022 - Tenable requests more information.
June 27, 2022 - Tenable requests more information.
June 27, 2022 - MSRC provides CVE information and again requests extension.
June 27, 2022 - Tenable requests clarification regarding extension.
June 28, 2022 - MSRC provides clarification. Tenable grants extension to July 12, 2022. MSRC acknowledges.
July 1, 2022 - MSRC requests delaying disclosure until September 9, 2022.
July 5, 2022 - Tenable denies request.
July 5, 2022 - MSRC acknowledges and requests clarification on content releases. A bit of back and forth between Tenable and MSRC occurs exchanging information needed for disclosure.
July 7, 2022 - Tenable provides blog draft to MSRC.
July 9, 2022 - MSRC provides status update. Tenable acknowledges.
July 11, 2022 - Tenable requests more information for advisory. MSRC acknowledges, but information has yet to be provided.

All information within TRA advisories is provided “as is”, without warranty of any kind, including the implied warranties of merchantability and fitness for a particular purpose, and with no guarantee of completeness, accuracy, or timeliness. Individuals and organizations are responsible for assessing the impact of any actual or potential security vulnerability.

Tenable takes product security very seriously. If you believe you have found a vulnerability in one of our products, we ask that you please work with us to quickly resolve it in order to protect customers. Tenable believes in responding quickly to such reports, maintaining communication with researchers, and providing a solution in short order.

For more details on submitting vulnerability information, please see our Vulnerability Reporting Guidelines page.

If you have questions or corrections about this advisory, please email [email protected]

Risk Information

CVE ID: CVE-2022-33675
Tenable Advisory ID: TRA-2022-26
Credit:
Jimi Sebree
CVSSv3 Base / Temporal Score:
7.8 / 7.2
CVSSv3 Vector:
AV:L/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H
Affected Products:
Microsoft Azure Site Recovery
Risk Factor:
High

Advisory Timeline

July 12, 2022 - Initial release.
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