CVE-2023-34449

low-risk
Published 2023-06-14

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.

Do I need to act?

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0.24% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.3/10 Medium
NETWORK / LOW complexity

Affected Products (1)

Ink\!

Affected Vendors

Parity

References (10)

Exploit https://docs.rs/ink_env/4.2.0/ink_env/call/struct.CallBuilder.html#method.delega...
Exploit https://docs.rs/ink_env/4.2.0/ink_env/fn.invoke_contract_delegate.html
Patch https://github.com/paritytech/ink/commit/f1407ee9f87e5f64d467a22d26ee88f61db7f3d...
Patch https://github.com/paritytech/ink/pull/1450
Exploit https://github.com/paritytech/ink/security/advisories/GHSA-853p-5678-hv8f
Exploit https://docs.rs/ink_env/4.2.0/ink_env/call/struct.CallBuilder.html#method.delega...
Exploit https://docs.rs/ink_env/4.2.0/ink_env/fn.invoke_contract_delegate.html
Patch https://github.com/paritytech/ink/commit/f1407ee9f87e5f64d467a22d26ee88f61db7f3d...
Patch https://github.com/paritytech/ink/pull/1450
Exploit https://github.com/paritytech/ink/security/advisories/GHSA-853p-5678-hv8f
27
/ 100
low-risk
Severity 21/34 · High
Exploitability 1/34 · Minimal
Exposure 5/34 · Minimal