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Q1What is this vulnerability? (Essence + Consequences)
๐จ **Essence**: Vyper `slice()` function has a boundary check overflow bug. ๐ **Consequences**: Allows Out-of-Bounds (OOB) access to storage, memory, or call data.โฆ
๐ก๏ธ **CWE**: CWE-119 (Improper Restriction of Operations within the Bounds of a Memory Buffer). ๐ **Flaw**: The `slice()` function in Vyper fails to properly validate boundaries, causing an overflow in its checks.
Q3Who is affected? (Versions/Components)
๐ฆ **Vendor**: vyperlang. ๐ฆ **Product**: Vyper (Pythonic smart contract language for EVM). โ ๏ธ **Affected**: Versions **0.3.10 and earlier**. Newer versions are safe.
๐ **Threshold**: Low. ๐ **Vector**: Network (AV:N). ๐ซ **Auth**: None required (PR:N). ๐ค **User**: No interaction needed (UI:N). AC:L (Low Complexity). This is a remote, unauthenticated, easy-to-exploit vulnerability.
Q6Is there a public Exp? (PoC/Wild Exploitation)
๐ต๏ธ **Public Exp**: No specific PoC code provided in the data. ๐ **References**: GitHub Advisory (GHSA-9x7f-gwxq-6f2c) and Issue #3756 confirm the flaw.โฆ
โ **Fixed**: Yes. The vulnerability is tracked in GitHub Security Advisories. ๐ **Published**: Feb 1, 2024. ๐ **Action**: Upgrade Vyper compiler to a version **newer than 0.3.10** to apply the fix.
Q9What if no patch? (Workaround)
๐ง **Workaround**: If stuck on old version, **avoid using `slice()`** entirely. ๐ **Mitigation**: Manually implement safe boundary checks before slicing.โฆ