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Malicious users could abuse Sydent to control the content of invitation emails

Moderate severity GitHub Reviewed Published Apr 15, 2021 in matrix-org/sydent • Updated Jan 30, 2023

Package

pip matrix-sydent (pip)

Affected versions

< 2.3.0

Patched versions

2.3.0

Description

Impact

A malicious user could abuse Sydent to send out arbitrary emails from the Sydent email address. This could be used to construct plausible phishing emails, for example.

Patches

Fixed in 4469d1d, 6b405a8, 65a6e91.

Note that these patches include changes to the default email templates. If these templates have been locally modified, they must also be updated.

For more information

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

References

@richvdh richvdh published to matrix-org/sydent Apr 15, 2021
Reviewed Apr 15, 2021
Published by the National Vulnerability Database Apr 15, 2021
Published to the GitHub Advisory Database Apr 19, 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
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality
Low
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:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

EPSS score

0.070%
(31st percentile)

Weaknesses

CVE ID

CVE-2021-29432

GHSA ID

GHSA-mh74-4m5g-fcjx

Source code

No known source code
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