This is a summary of the AI-generated 10-question deep analysis. The full version (longer answers, follow-up Q&A, related CVEs) requires login. Read the full analysis β
Q1What is this vulnerability? (Essence + Consequences)
π¨ **Essence**: Vyper compiler allows signed integers as array indices. π **Consequences**: Leads to **Denial of Service (DoS)**.β¦
π‘οΈ **Root Cause**: **CWE-129** (Improper Validation of Array Index). The flaw lies in the type checker allowing **signed integers** where only unsigned are safe for array indexing. π See: `subscriptable.py` & `core.py`.
Q3Who is affected? (Versions/Components)
π₯ **Affected**: **vyperlang/vyper**. Specifically versions **0.3.10 and earlier**. π¦ If you use Vyper for EVM smart contracts, you are at risk.
Q4What can hackers do? (Privileges/Data)
π **Attacker Impact**: Primarily **Denial of Service**. β Hackers can crash contracts or freeze execution. While CVSS is High (H/H/H), the primary vector is stability, not direct data theft or privilege escalation.
Q5Is exploitation threshold high? (Auth/Config)
π **Exploitation Threshold**: **Low**. π Network Access (AV:N), Low Complexity (AC:L), No Privileges (PR:N), No User Interaction (UI:N). Anyone can trigger this if they interact with the vulnerable contract code.
Q6Is there a public Exp? (PoC/Wild Exploitation)
π **Public Exploit**: **No PoC provided** in the data. π΅οΈ However, the logic is straightforward (passing negative numbers). Wild exploitation is likely possible for anyone understanding Vyper syntax.
Q7How to self-check? (Features/Scanning)
π **Self-Check**: Scan your Vyper code for array indexing using variables that could be **signed integers**. π§ Use static analysis tools on Vyper versions < 0.3.10. Check GitHub advisories for specific patterns.
π§ **No Patch Workaround**: Manually enforce **unsigned integer types** for all array indices in your code. π Explicitly cast or validate inputs to ensure they are non-negative before indexing.
Q10Is it urgent? (Priority Suggestion)
β‘ **Urgency**: **High Priority**. π¨ CVSS Score is High. Smart contracts are immutable; a DoS can freeze user funds. Patch immediately to ensure contract stability and security.