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:- https://github.com/matrix-org/sydent/security/advisories/GHSA-mh74-4m5g-fcjx
- https://nvd.nist.gov/vuln/detail/CVE-2021-29432
- https://github.com/matrix-org/sydent/commit/4469d1d42b2b1612b70638224c07e19623039c42
- https://github.com/matrix-org/sydent/releases/tag/v2.3.0
- https://github.com/pypa/advisory-database/tree/main/vulns/matrix-sydent/PYSEC-2021-23.yaml
- https://pypi.org/project/matrix-sydent
- https://github.com/advisories/GHSA-mh74-4m5g-fcjx