Security-feature bypass via malformed URI normalization
Published Feb 11, 2020 · Updated Aug 4, 2024
Security-feature bypass in affected Microsoft Outlook and Office releases allows remote attackers to evade link checks via malformed URIs. Outlook accepts a benign displayed link whose malformed file-like URI target escapes link inspection, then normalizes that target into an HTTP URL when clicked. Exploitation requires user interaction; the bypass does not execute code by itself but can deliver a second exploit or malicious destination.
Summary
What happened
Security-feature bypass in affected Microsoft Outlook and Office releases allows remote attackers to evade link checks via malformed URIs. Outlook accepts a benign displayed link whose malformed file-like URI target escapes link inspection, then normalizes that target into an HTTP URL when clicked. Exploitation requires user interaction; the bypass does not execute code by itself but can deliver a second exploit or malicious destination.
The record
- CVE
- CVE-2020-0696
- Published
- Feb 11, 2020
- Updated
- Aug 4, 2024
- Vendor
- Microsoft
- Product
- Microsoft Office
- Classifications
- T1566.002, T1204.001
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 11, 2020CVE publishedPublication date reported by the CVE source.
- Aug 4, 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=2019 for 32-bit editions
- Affected versionversion=2019 for 64-bit editions
What conditions does exploitation require?
What is affected?
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
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Your stack
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