dbcve.org
Ink\!Application · Parity

CVE-2023-34449

MEDIUM · 5.3 CVSS v3.1 Published 2023-06-14
Fix available
A fix is available. Upgrade to 4.2.1 or later.
See remediation →
62/100
Remediation priority · Elevated
Public exploit Remotely reachable No privileges Zero-click Patch available

Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.

NVD · unedited
ink! is an embedded domain specific language to write smart contracts in Rust for blockchains built on the Substrate framework. Starting in version 4.0.0 and prior to version 4.2.1, the return value when using delegate call mechanics, either through `CallBuilder::delegate` or `ink_env::invoke_contract_delegate`, is decoded incorrectly. This bug was related to the mechanics around decoding a call's return buffer, which was changed as part of pull request 1450. Since this feature was only released in ink! 4.0.0, no previous versions are affected. Users who have an ink! 4.x series contract should upgrade to 4.2.1 to receive a patch.

Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.

dbcve analysis

A detailed technical summary for this CVE is being prepared.

Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.

NVD · CPE data
Ink\!Application
Affected:>= 4.0.0, < 4.2.1

CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.

From the vector
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.

dbcve · scoped
Upgrade available Upgrade to 4.2.1 or later
Fixed in 4.2.1
Vendor patch github.com →
Recommended fix High confidence

ink! 4.2.1

  1. Identify all Cargo.toml files in your ink! contract projects that depend on ink!
  2. Locate the ink! dependency section (typically under [dependencies] or [package.metadata.ink])
  3. Update the ink! version constraint from the current version (>=4.0.0, <4.2.1) to exactly 4.2.1 or use the semver range ">=4.2.1,<5.0.0"
  4. Run `cargo update` to fetch the new dependencies
  5. Rebuild the contract using `cargo +nightly build --release` or your contract's build command
  6. Verify the contract compiles without errors
  7. If possible, re-run any existing test suites to ensure the delegate call functionality works correctly with the fix
Caveat Minor/patch release; should be backward compatible but review changelog for any behavioral changes before deploying to production

Generated from the published advisory — verify against the referenced sources before acting.

We can perform the upgrade in your staging environment and verify nothing breaks — typical engagement from $1,600. Get the upgrade done

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References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.

Primary sources

Practitioner notes

Contributed

Peer-ranked notes from engineers who’ve handled CVE-2023-34449 in production — separate from our analysis above.

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What belongs here
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  • Version or environment caveats, and links to real fixes
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