Microsoft Azure DevOps Server MachinePropertyBag Deserialization of Untrusted Data Local Privilege Escalation Vulnerability

September 12th, 2023
ZDI-23-1403 ZDI-CAN-20695

CVE ID

CVE-2023-38155

CVSS Score

7.0 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Vendors

Microsoft

Affected Products

Azure DevOps Server

Vulnerability Details

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Azure DevOps Server. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability.

The specific flaw exists within the MachinePropertyBag class. The issue results from the lack of proper validation of user-supplied data, which can result in deserialization of untrusted data. An attacker can leverage this vulnerability to escalate privileges and execute arbitrary code in the context of the service account.

Additional Details

Microsoft has issued an update to correct this vulnerability. More details can be found at:
https://msrc.microsoft.com/update-guide/vulnerability/CVE-2023-38155

Disclosure Timeline

  • 2023-05-05 - Vulnerability reported to vendor
  • 2023-09-12 - Coordinated public release of advisory

Credit

Mikhail Shcherbakov (@yu5k3)

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