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Remote Memory Exposure in bl

Moderate severity GitHub Reviewed Published Sep 2, 2020 to the GitHub Advisory Database • Updated Feb 1, 2023

Package

npm bl (npm)

Affected versions

= 3.0.0
>= 4.0.0, < 4.0.3
< 1.2.3
>= 2.0.0, < 2.2.1

Patched versions

3.0.1
4.0.3
1.2.3
2.2.1

Description

A buffer over-read vulnerability exists in bl <4.0.3, <3.0.1, <2.2.1, and <1.2.3 which could allow an attacker to supply user input (even typed) that if it ends up in consume() argument and can become negative, the BufferList state can be corrupted, tricking it into exposing uninitialized memory via regular .slice() calls.

References

Published by the National Vulnerability Database Aug 30, 2020
Reviewed Sep 2, 2020
Published to the GitHub Advisory Database Sep 2, 2020
Last updated Feb 1, 2023

Severity

Moderate

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
Low
Integrity
None
Availability
Low

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:L/I:N/A:L

EPSS score

0.147%
(51st percentile)

Weaknesses

CVE ID

CVE-2020-8244

GHSA ID

GHSA-pp7h-53gx-mx7r

Source code

No known source code
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