Overview
- Description
- Vyper is a Pythonic Smart Contract Language for the Ethereum Virtual Machine (EVM). In versions 0.2.15, 0.2.16 and 0.3.0, named re-entrancy locks are allocated incorrectly. Each function using a named re-entrancy lock gets a unique lock regardless of the key, allowing cross-function re-entrancy in contracts compiled with the susceptible versions. A specific set of conditions is required to result in misbehavior of affected contracts, specifically: a `.vy` contract compiled with `vyper` versions `0.2.15`, `0.2.16`, or `0.3.0`; a primary function that utilizes the `@nonreentrant` decorator with a specific `key` and does not strictly follow the check-effects-interaction pattern (i.e. contains an external call to an untrusted party before storage updates); and a secondary function that utilizes the same `key` and would be affected by the improper state caused by the primary function. Version 0.3.1 contains a fix for this issue.
- Source
- security-advisories@github.com
- NVD status
- Modified
Risk scores
CVSS 4.0
- Type
- Secondary
- Base score
- 9.1
- Impact score
- -
- Exploitability score
- -
- Vector string
- CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/VA:H/SC:N/SI:H/SA:H/E:A/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
- Severity
- CRITICAL
CVSS 3.1
- Type
- Primary
- Base score
- 5.9
- Impact score
- 3.6
- Exploitability score
- 2.2
- Vector string
- CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
- Severity
- MEDIUM
Weaknesses
- security-advisories@github.com
- CWE-863
Social media
- Hype score
- Not currently trending
Configurations
[
{
"nodes": [
{
"negate": false,
"cpeMatch": [
{
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"vulnerable": true,
"matchCriteriaId": "D77BED2E-B82A-49C3-A555-04F77E181013"
},
{
"criteria": "cpe:2.3:a:vyperlang:vyper:0.2.16:*:*:*:*:python:*:*",
"vulnerable": true,
"matchCriteriaId": "1DF78911-B188-4F6F-8E8A-BF120C425C8F"
},
{
"criteria": "cpe:2.3:a:vyperlang:vyper:0.3.0:*:*:*:*:python:*:*",
"vulnerable": true,
"matchCriteriaId": "B371A623-7B66-4D86-A8E9-0CBC01AEC1F4"
}
],
"operator": "OR"
}
]
}
]