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DoS vulnerabiliity in json parser

Moderate
comawill published GHSA-phxv-pffh-fq2r Apr 13, 2022

Package

wire-server (wire)

Affected versions

<v2022-03-01

Patched versions

v2022-03-01

Description

Impact

The used 3rd-party Library aeson stores JSON objects as hash maps (from unordered-container) that have collision problems. This allows an attacker to craft an object that causes the server to spend quadratic time parsing it, resulting in a denial of service.

Patches

  • The issue has been fixed in wire-server 2022-03-01 and is already deployed on all Wire managed services.
  • On premise instances of wire-server need to be updated to 2022-03-01, so that their backends are no longer affected.

Workarounds

  • No workarounds known

References

For more information

If you have any questions or comments about this advisory feel free to email us at [email protected]

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
None
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:N/I:N/A:L

CVE ID

CVE-2021-41119

Weaknesses

No CWEs