Integrity bypass via weak DCOM activation authentication
Published Jun 8, 2021 · Updated Aug 3, 2024
Security feature bypass in Microsoft Windows DCOM allows remote authenticated users to alter activation traffic through network requests. DCOM servers accept activation requests below RPC_C_AUTHN_LEVEL_PKT_INTEGRITY, leaving the request without the packet-integrity protection later enforced by Microsoft. Exploitation requires low privileges and user interaction and affects integrity without reported data disclosure or service interruption.
Summary
What happened
Security feature bypass in Microsoft Windows DCOM allows remote authenticated users to alter activation traffic through network requests. DCOM servers accept activation requests below RPC_C_AUTHN_LEVEL_PKT_INTEGRITY, leaving the request without the packet-integrity protection later enforced by Microsoft. Exploitation requires low privileges and user interaction and affects integrity without reported data disclosure or service interruption.
The record
- CVE
- CVE-2021-26414
- Published
- Jun 8, 2021
- Updated
- Aug 3, 2024
- Vendor
- Microsoft
- Product
- Windows 10 Version 1507
- Classifications
- T1557
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Jun 8, 2021CVE publishedPublication date reported by the CVE source.
- Aug 3, 2024Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
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- Affected versionversion=10.0.0 <10.0.10240.19802
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Windows Kerberos AppContainer Enterprise Authentication Capability Bypass proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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