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CVE-2023-31146— Vyper vulnerable to OOB DynArray access when array is on both LHS and RHS of an assignment

Quick assessment

Affected
vyperlang vyper
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Vyper是EVM 的 Pythonic 智能合约语言。 Vyper 0.3.8之前版本存在缓冲区错误漏洞。攻击者利用该漏洞导致数组访问越界。

CVSS 7.5 · High EPSS 1.24% · P68

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-31146

Vulnerability Information
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Vulnerability Title
Vyper vulnerable to OOB DynArray access when array is on both LHS and RHS of an assignment
Source: CVE Program / CVE List V5
Vulnerability Description
Vyper is a Pythonic smart contract language for the Ethereum virtual machine. Prior to version 0.3.8, during codegen, the length word of a dynarray is written before the data, which can result in out-of-bounds array access in the case where the dynarray is on both the lhs and rhs of an assignment. The issue can cause data corruption across call frames. The expected behavior is to revert due to out-of-bounds array access. Version 0.3.8 contains a patch for this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
Vyper 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vyper是EVM 的 Pythonic 智能合约语言。 Vyper 0.3.8之前版本存在缓冲区错误漏洞。攻击者利用该漏洞导致数组访问越界。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
vyperlang vyper < 0.3.8 -

II. Public POCs for CVE-2023-31146

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III. Intelligence Information for CVE-2023-31146

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Patches & Fixes for CVE-2023-31146 (1)

Vendor Advisories for CVE-2023-31146 (1)

Same Patch Batch · vyperlang · 2023-05-11 · 3 CVEs total

CVE-2023-32058 7.5 HIGH Vyper vulnerable to integer overflow in loop
CVE-2023-32059 7.5 HIGH Vyper vulnerable to incorrect ordering of arguments for kwargs passed to internal calls

IV. Related Vulnerabilities

Same product: vyper
Same vendor: vyperlang
Same weakness: CWE-787

V. Comments for CVE-2023-31146

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