Authenticated UI spoofing via certificate-derived CSRF token
Published Feb 25, 2021 · Updated Aug 3, 2024
Spoofing in Microsoft Exchange Server 2016 CU18–CU19 and 2019 CU7–CU8 allows remote authenticated users to alter displayed content. A certificate-file disclosure supplies material from which Exchange generates a CSRF token; Microsoft has not disclosed the affected endpoint or code operation. Exploitation requires low-privilege authentication and victim interaction, and can alter content presented in another security context.
Summary
What happened
Spoofing in Microsoft Exchange Server 2016 CU18–CU19 and 2019 CU7–CU8 allows remote authenticated users to alter displayed content. A certificate-file disclosure supplies material from which Exchange generates a CSRF token; Microsoft has not disclosed the affected endpoint or code operation. Exploitation requires low-privilege authentication and victim interaction, and can alter content presented in another security context.
The record
- CVE
- CVE-2021-24085
- Published
- Feb 25, 2021
- Updated
- Aug 3, 2024
- Vendor
- Microsoft
- Product
- Microsoft Exchange Server 2016 Cumulative Update 18
- Classifications
- Unavailable
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 25, 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?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=15.01.0 <publication
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
No sourced classifications are available.
Public exploit references
No public exploit references are available in this record.
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Technologies
Your stack
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Your stack
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