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matrix-sdk-crypto contains a log exposure of private key of the server-side key backup

Moderate severity GitHub Reviewed Published May 13, 2024 in matrix-org/matrix-rust-sdk • Updated May 14, 2024

Package

cargo matrix-sdk-crypto (Rust)

Affected versions

= 0.7.0

Patched versions

0.7.1

Description

Introduction

In Matrix, the server-side key backup stores encrypted copies of Matrix message keys. This facilitates key sharing between a user's devices and provides a redundant copy in case all devices are lost. The key backup uses asymmetric cryptography, with each server-side key backup assigned a unique public-private key pair.

Impact

Due to a logic bug introduced in matrix-org/matrix-rust-sdk@71136e4, the matrix-sdk-crypto crate version 0.7.0 will sometimes log the private part of the backup key pair to Rust debug logs (using the tracing crate).

Patches

This issue has been resolved in matrix-sdk-crypto version 0.7.1.

Workarounds

None.

References

For more information

If you have any questions or comments about this advisory, please email us at security at matrix.org.

References

@dkasak dkasak published to matrix-org/matrix-rust-sdk May 13, 2024
Published to the GitHub Advisory Database May 13, 2024
Reviewed May 13, 2024
Published by the National Vulnerability Database May 14, 2024
Last updated May 14, 2024

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

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:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N

EPSS score

0.045%
(16th percentile)

Weaknesses

CVE ID

CVE-2024-34353

GHSA ID

GHSA-9ggc-845v-gcgv

Source code

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