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Deserialization of Untrusted Data in logback

Moderate severity GitHub Reviewed Published Dec 17, 2021 to the GitHub Advisory Database • Updated Jan 30, 2023

Package

maven ch.qos.logback:logback-core (Maven)

Affected versions

< 1.2.9

Patched versions

1.2.9

Description

In logback version 1.2.7 and prior versions, an attacker with the required privileges to edit configurations files could craft a malicious configuration allowing to execute arbitrary code loaded from LDAP servers.

References

Published by the National Vulnerability Database Dec 16, 2021
Reviewed Dec 17, 2021
Published to the GitHub Advisory Database Dec 17, 2021
Last updated Jan 30, 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
High
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
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:H/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS score

1.555%
(88th percentile)

Weaknesses

CVE ID

CVE-2021-42550

GHSA ID

GHSA-668q-qrv7-99fm

Source code

Credits

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