Code execution via self-message layout overflow
Published Jul 5, 2023 · Updated Aug 2, 2024
Heap-based buffer overflow in Diagon 1.0.139 allows context-dependent attackers to execute code through a crafted Markdown file. Sequence::LayoutComputeActorsPositions repeatedly increases a self-referencing actor's coordinates without creating message space, and Screen::DrawText then writes past the allocated lines_ matrix. Triggering requires a user to open the file in the Sequence translator; successful exploitation runs code in that user's context.
Summary
What happened
Heap-based buffer overflow in Diagon 1.0.139 allows context-dependent attackers to execute code through a crafted Markdown file. Sequence::LayoutComputeActorsPositions repeatedly increases a self-referencing actor's coordinates without creating message space, and Screen::DrawText then writes past the allocated lines_ matrix. Triggering requires a user to open the file in the Sequence translator; successful exploitation runs code in that user's context.
The record
- CVE
- CVE-2023-27390
- Published
- Jul 5, 2023
- Updated
- Aug 2, 2024
- Vendor
- Diagon Project
- Product
- Diagon
- Classifications
- CWE-122, T1203, T1204.002
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 5, 2023CVE publishedPublication date reported by the CVE source.
- Aug 2, 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=1.0.139
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
- Cisco Talos self-message Markdown proof of conceptproof of concept · demonstrated
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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