Allocation of Resources Without Limits or Throttling Affecting synapse package, versions <1.110.0-r0
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Start learning- Snyk IDSNYK-ALPINE321-SYNAPSE-8489432
- published6 Dec 2024
- disclosed3 Dec 2024
Introduced: 3 Dec 2024
NewCVE-2024-37302 (opens in a new tab)How to fix?
Upgrade Alpine:3.21 synapse to version 1.110.0-r0 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream synapse package and not the synapse package as distributed by Alpine.
See How to fix? for Alpine:3.21 relevant fixed versions and status.
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.