Verification hang via unbounded Ed25519 scalar reduction
Published May 9, 2024 · Updated Nov 5, 2024
Denial of service in Bouncy Castle for Java 1.73 through 1.77 allows remote attackers to hang verification via crafted Ed25519 inputs. The Ed25519 implVerify path passes an attacker-derived scalar into Scalar25519.reduceBasisVar, whose reduction loop lacked an iteration bound and could fail to converge. Exposure requires an application to verify an attacker-supplied signature and public key; the resulting loop consumes the verification thread indefinitely.
Summary
What happened
Denial of service in Bouncy Castle for Java 1.73 through 1.77 allows remote attackers to hang verification via crafted Ed25519 inputs. The Ed25519 implVerify path passes an attacker-derived scalar into Scalar25519.reduceBasisVar, whose reduction loop lacked an iteration bound and could fail to converge. Exposure requires an application to verify an attacker-supplied signature and public key; the resulting loop consumes the verification thread indefinitely.
The record
- CVE
- CVE-2024-30172
- Published
- May 9, 2024
- Updated
- Nov 5, 2024
- Vendor
- Legion of the Bouncy Castle Inc.
- Product
- Bouncy Castle for Java
- Classifications
- CWE-835, T1499
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- May 9, 2024CVE publishedPublication date reported by the CVE source.
- Nov 5, 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?
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- Affected versionversion=0 <1.78
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Your stack
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