Описание
Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. A discovered oEmbed or image URL can bypass the url_preview_url_blacklist setting potentially allowing server side request forgery or bypassing network policies. Impact is limited to IP addresses allowed by the url_preview_ip_range_blacklist setting (by default this only allows public IPs) and by the limited information returned to the client: 1. For discovered oEmbed URLs, any non-JSON response or a JSON response which includes non-oEmbed information is discarded. 2. For discovered image URLs, any non-image response is discarded. Systems which have URL preview disabled (via the url_preview_enabled setting) or have not configured a url_preview_url_blacklist are not affected. This issue has been addressed in version 1.85.0. Users are advised to upgrade. User unable to upgrade may also disable URL previews.
| Релиз | Статус | Примечание |
|---|---|---|
| bionic | ignored | end of standard support |
| esm-apps/bionic | released | 0.24.0+dfsg-1ubuntu0.1~esm4 |
| esm-apps/focal | released | 1.11.0-1ubuntu0.1~esm2 |
| esm-apps/jammy | released | 1.53.0-1ubuntu0.1~esm2 |
| esm-apps/noble | not-affected | 1.100.0-1ubuntu1 |
| focal | ignored | end of standard support, was needed |
| jammy | needed | |
| kinetic | ignored | end of life, was needs-triage |
| lunar | ignored | end of life, was needs-triage |
| mantic | ignored | end of life, was needs-triage |
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EPSS
3.5 Low
CVSS3
Связанные уязвимости
Synapse is a Matrix protocol homeserver written in Python with the Twisted framework. A discovered oEmbed or image URL can bypass the `url_preview_url_blacklist` setting potentially allowing server side request forgery or bypassing network policies. Impact is limited to IP addresses allowed by the `url_preview_ip_range_blacklist` setting (by default this only allows public IPs) and by the limited information returned to the client: 1. For discovered oEmbed URLs, any non-JSON response or a JSON response which includes non-oEmbed information is discarded. 2. For discovered image URLs, any non-image response is discarded. Systems which have URL preview disabled (via the `url_preview_enabled` setting) or have not configured a `url_preview_url_blacklist` are not affected. This issue has been addressed in version 1.85.0. Users are advised to upgrade. User unable to upgrade may also disable URL previews.
Synapse is a Matrix protocol homeserver written in Python with the Twi ...
Synapse has URL deny list bypass via oEmbed and image URLs when generating previews
EPSS
3.5 Low
CVSS3