Описание
Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion. This is sometimes recoverable and leads to an error for the request causing the problem, but in other cases the Synapse process may crash altogether. It is possible to exploit this maliciously, either by malicious users on the homeserver, or by remote users sending URLs that a local user's client may automatically request a URL preview for. Remote users are not able to exploit this directly, because the URL preview endpoint is authenticated. Deployments with url_preview_enabled: false set in configuration are not affected. Deployments with url_preview_enabled: true set in configuration are affected. Deployments with no configuration value set for url_preview_enabled are not affected, because the default is false. Administrators of homeservers w...
| Релиз | Статус | Примечание |
|---|---|---|
| bionic | ignored | end of standard support, was needs-triage |
| esm-apps/bionic | needs-triage | |
| esm-apps/focal | needs-triage | |
| esm-apps/jammy | needs-triage | |
| esm-apps/noble | not-affected | 1.61.1-1 |
| focal | ignored | end of standard support, was needs-triage |
| impish | ignored | end of life |
| jammy | needs-triage | |
| kinetic | not-affected | 1.61.1-1 |
| lunar | not-affected | 1.61.1-1 |
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EPSS
3.5 Low
CVSS2
6.5 Medium
CVSS3
Связанные уязвимости
Synapse is an open source home server implementation for the Matrix chat network. In versions prior to 1.61.1 URL previews of some web pages can exhaust the available stack space for the Synapse process due to unbounded recursion. This is sometimes recoverable and leads to an error for the request causing the problem, but in other cases the Synapse process may crash altogether. It is possible to exploit this maliciously, either by malicious users on the homeserver, or by remote users sending URLs that a local user's client may automatically request a URL preview for. Remote users are not able to exploit this directly, because the URL preview endpoint is authenticated. Deployments with `url_preview_enabled: false` set in configuration are not affected. Deployments with `url_preview_enabled: true` set in configuration **are** affected. Deployments with no configuration value set for `url_preview_enabled` are not affected, because the default is `false`. Administrators of homeservers with
Synapse is an open source home server implementation for the Matrix ch ...
URL previews of unusual or maliciously-crafted pages can crash Synapse media repositories or Synapse monoliths
EPSS
3.5 Low
CVSS2
6.5 Medium
CVSS3