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Off-by-one Error in v2fly/v2ray-core

Critical severity GitHub Reviewed Published Feb 24, 2022 to the GitHub Advisory Database • Updated Feb 3, 2023

Package

gomod github.com/v2fly/v2ray-core (Go)

Affected versions

< 4.44.0

Patched versions

None
gomod github.com/v2fly/v2ray-core/v4 (Go)
< 4.44.0
4.44.0

Description

v2fly/v2ray-core prior to 4.44.0 is vulnerable to an off-by-one error. Indexing operations on arrays, slices, or strings should use an index at most one less than the length. If the index is checked for being less than or equal to the length (<=), instead of less than the length (<), the index could be out of bounds.

References

Published by the National Vulnerability Database Feb 23, 2022
Published to the GitHub Advisory Database Feb 24, 2022
Reviewed Feb 24, 2022
Last updated Feb 3, 2023

Severity

Critical

CVSS overall score

This score calculates overall vulnerability severity from 0 to 10 and is based on the Common Vulnerability Scoring System (CVSS).
/ 10

CVSS v3 base metrics

Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
High

CVSS v3 base metrics

Attack vector: More severe the more the remote (logically and physically) an attacker can be in order to exploit the vulnerability.
Attack complexity: More severe for the least complex attacks.
Privileges required: More severe if no privileges are required.
User interaction: More severe when no user interaction is required.
Scope: More severe when a scope change occurs, e.g. one vulnerable component impacts resources in components beyond its security scope.
Confidentiality: More severe when loss of data confidentiality is highest, measuring the level of data access available to an unauthorized user.
Integrity: More severe when loss of data integrity is the highest, measuring the consequence of data modification possible by an unauthorized user.
Availability: More severe when the loss of impacted component availability is highest.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

EPSS score

0.236%
(62nd percentile)

Weaknesses

CVE ID

CVE-2021-4070

GHSA ID

GHSA-4cxw-hq44-r344

Source code

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