Unauthenticated plaintext use via uncleared decryption buffer
Published Mar 3, 2025 · Updated Mar 3, 2025
Improper authentication in RustCrypto ascon_aead before 0.4.3 allows attackers to use unauthenticated plaintext after failed decryption. The decrypt_inplace path in asconcore.rs returns an error for an invalid tag but leaves decrypted bytes in the caller-provided buffer. Exploitation requires a consuming program to process that buffer after the failure, enabling chosen-ciphertext manipulation and plaintext exposure.
Summary
What happened
Improper authentication in RustCrypto ascon_aead before 0.4.3 allows attackers to use unauthenticated plaintext after failed decryption. The decrypt_inplace path in asconcore.rs returns an error for an invalid tag but leaves decrypted bytes in the caller-provided buffer. Exploitation requires a consuming program to process that buffer after the failure, enabling chosen-ciphertext manipulation and plaintext exposure.
The record
- CVE
- CVE-2025-27498
- Published
- Mar 3, 2025
- Updated
- Mar 3, 2025
- Vendor
- RustCrypto
- Product
- AEADs
- Classifications
- CWE-347
- Attack vector
- local
- Privileges
- unauthenticated
Timeline
How it unfolded
- Mar 3, 2025CVE publishedPublication date reported by the CVE source.
- Mar 3, 2025Record 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=< 0.4.3
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
- Upstream invalid-tag buffer proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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