Crash via unbounded spell-suggestion trie depth
Published Jan 30, 2022 · Updated Aug 2, 2024
Stack-based buffer overflow in Vim before 8.2.4247 allows local users to crash the editor by triggering crafted spell suggestions. In src/spellsuggest.c, suggest_trie_walk can increase its depth past MAXWLEN and then index fixed-size stack arrays beyond their bounds. Exploitation requires a user to open attacker-controlled content and request spelling suggestions; the resulting stack corruption can crash Vim or execute code in that user's context.
Summary
What happened
Stack-based buffer overflow in Vim before 8.2.4247 allows local users to crash the editor by triggering crafted spell suggestions. In src/spellsuggest.c, suggest_trie_walk can increase its depth past MAXWLEN and then index fixed-size stack arrays beyond their bounds. Exploitation requires a user to open attacker-controlled content and request spelling suggestions; the resulting stack corruption can crash Vim or execute code in that user's context.
The record
- CVE
- CVE-2022-0408
- Published
- Jan 30, 2022
- Updated
- Aug 2, 2024
- Vendor
- Vim
- Product
- Vim
- Classifications
- CWE-121, T1204.002
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- Jan 30, 2022CVE 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=unspecified <8.2
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.
Public exploit references
- Upstream spell-suggestion depth regression testproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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