CVE-2024-37302

Description

Synapse is an open-source Matrix homeserver. Synapse versions before 1.106 are vulnerable to a disk fill attack, where an unauthenticated adversary can induce Synapse to download and cache large amounts of remote media. The default rate limit strategy is insufficient to mitigate this. This can lead to a denial of service, ranging from further media uploads/downloads failing to completely unavailability of the Synapse process, depending on how Synapse was deployed. Synapse 1.106 introduces a new "leaky bucket" rate limit on remote media downloads to reduce the amount of data a user can request at a time. This does not fully address the issue, but does limit an unauthenticated user's ability to request large amounts of data to be cached.

Reserved 2024-06-05 | Published 2024-12-03 | Updated 2024-12-03 | Assigner GitHub_M

Problem types

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

< 1.106
affected

References

github.com/...ynapse/security/advisories/GHSA-4mhg-xv73-xq2x

cve.org (CVE-2024-37302)

nvd.nist.gov (CVE-2024-37302)

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