Microsoft Windows User Profile Service Privilege Escalation
CVE-2022-26904 is a medium-severity concurrent execution using shared resource with improper synchronization vulnerability in Windows 10 Version 1809 from Microsoft, with a CVSS 2.0 base score of 4.4 out of 10. It can be exploited with local access to the system by an unauthenticated attacker, without any action from a user. The record lists version 10.0.17763.2803 as the first without the flaw, so updating Windows 10 Version 1809 to that release or later removes the exposure. CISA added it to the Known Exploited Vulnerabilities catalogue on April 25, 2022, which means attacks have been observed in the wild.
Attackers are already exploiting this vulnerability, according to CISA.
What to do
- Update Windows 10 Version 1809 to 10.0.17763.2803 or a later version.
- Update Windows Server 2019 to 10.0.17763.2803 or a later version.
- Update Windows Server 2019 (Server Core installation) to 10.0.17763.2803 or a later version.
- CISA's required action: Apply updates per vendor instructions.
- Read the advisory on msrc.microsoft.com for workarounds and exact fixed builds.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 up to, but not including, 10.0.17763.2803; 10.0.0 up to, but not including, 10.0.17763.2803 | 10.0.17763.2803 |
| Microsoft | Windows Server 2019 | 10.0.17763.0 up to, but not including, 10.0.17763.2803 | 10.0.17763.2803 |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 up to, but not including, 10.0.17763.2803 | 10.0.17763.2803 |
| Microsoft | Windows 10 Version 1909 | 10.0.0 up to, but not including, 10.0.18363.2212 | 10.0.18363.2212 |
| Microsoft | Windows 10 Version 21H1 | 10.0.0 up to, but not including, 10.0.19043.1645 | 10.0.19043.1645 |
| Microsoft | Windows Server 2022 | 10.0.20348.0 up to, but not including, 10.0.20348.643 | 10.0.20348.643 |
| Microsoft | Windows 10 Version 20H2 | 10.0.0 up to, but not including, 10.0.19042.1645 | 10.0.19042.1645 |
| Microsoft | Windows Server version 20H2 | 10.0.0 up to, but not including, 10.0.19042.1645 | 10.0.19042.1645 |
| Microsoft | Windows 11 version 21H2 | 10.0.0 up to, but not including, 10.0.22000.613 | 10.0.22000.613 |
| Microsoft | Windows 10 Version 21H2 | 10.0.19043.0 up to, but not including, 10.0.19044.1645 | 10.0.19044.1645 |
| Microsoft | Windows 10 Version 1507 | 10.0.10240.0 up to, but not including, 10.0.10240.19265 | 10.0.10240.19265 |
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 up to, but not including, 10.0.14393.5066 | 10.0.14393.5066 |
| Microsoft | Windows Server 2016 | 10.0.14393.0 up to, but not including, 10.0.14393.5066 | 10.0.14393.5066 |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 up to, but not including, 10.0.14393.5066 | 10.0.14393.5066 |
| Microsoft | Windows 7 | 6.1.0 up to, but not including, 6.1.7601.25924 | 6.1.7601.25924 |
| Microsoft | Windows 7 Service Pack 1 | 6.1.0 up to, but not including, 6.1.7601.25924 | 6.1.7601.25924 |
| Microsoft | Windows 8.1 | 6.3.0 up to, but not including, 6.3.9600.20337 | 6.3.9600.20337 |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.6003.0 up to, but not including, 6.0.6003.21446 | 6.0.6003.21446 |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | 6.0.6003.0 up to, but not including, 6.0.6003.21446 | 6.0.6003.21446 |
| Microsoft | Windows Server 2008 R2 Service Pack 1 | 6.1.7601.0 up to, but not including, 6.1.7601.25924 | 6.1.7601.25924 |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | 6.1.7601.0 up to, but not including, 6.1.7601.25924 | 6.1.7601.25924 |
| Microsoft | Windows Server 2012 | 6.2.9200.0 up to, but not including, 6.2.9200.23679 | 6.2.9200.23679 |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 up to, but not including, 6.2.9200.23679 | 6.2.9200.23679 |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 up to, but not including, 6.3.9600.20337 | 6.3.9600.20337 |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 up to, but not including, 6.3.9600.20337 | 6.3.9600.20337 |
Version data comes from the organisation that assigned the CVE; 11 further products are omitted here. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Access vector
- LocalLocal access is required.
- Access complexity
- MediumSome conditions must be met.
- Authentication
- NoneNo login is needed.
- Confidentiality
- PartialSome data can be read.
- Integrity
- PartialSome data can be modified.
- Availability
- PartialAvailability is reduced.
Vector: AV:L/AC:M/Au:N/C:P/I:P/A:P. Scored by NVD.
| Scoring system | Score | Severity | Scored by |
|---|---|---|---|
| CVSS 3.1 | 7.0 | High | CNA (microsoft.com) |
| CVSS 2.0 | 4.4 | Medium | NVD |
Official description
Windows User Profile Service Elevation of Privilege Vulnerability
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Concurrent Execution using Shared Resource with Improper Synchronization
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.
How developers prevent this class of flaw
- In languages that support it, use synchronization primitives. Only wrap these around critical code to minimize the impact on performance.
- Use thread-safe capabilities such as the data access abstraction in Spring.
- Minimize the usage of shared resources in order to remove as much complexity as possible from the control flow and to reduce the likelihood of unexpected conditions occurring. Additionally, this will minimize the amount of synchronization necessary and may even help to reduce the likelihood of a denial of service where an attacker may be able to repeatedly trigger a critical section (CWE-400).
Timeline
- CVE record published.
- Added to CISA's Known Exploited Vulnerabilities catalogue.
- Deadline for US federal agencies to remediate, set by CISA.
- CISA published its SSVC assessment (exploitation: active, automatable: no, technical impact: total).
- Record last changed materially (score, affected products, status or references).
References
Third-party and government advisories
- cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-26904US Government Resource
Recent Concurrent Execution using Shared Resource with Improper Synchronization vulnerabilities
- 7.0 High severity
- 7.4 High severity
- 7.0 High severity
- 7.0 High severity
- 7.0 High severity
- 7.0 High severity
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