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    <link>https://cve.radiocsirt.org</link>
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      <title>CVE-2024-52805 — Synapse allows unsupported content types to lead to memory exhaustion</title>
      <link>https://cve.radiocsirt.org/vuln/cve-2024-52805</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; element-hq synapse&lt;/p&gt;
&lt;p&gt;Synapse is an open-source Matrix homeserver. In Synapse before 1.120.1, multipart/form-data requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks. Synapse 1.120.1 resolves the issue by denying requests with unsupported multipart/form-data content type.&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; element-hq synapse&lt;/p&gt;
&lt;p&gt;Synapse is an open-source Matrix homeserver. In Synapse before 1.120.1, multipart/form-data requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks. Synapse 1.120.1 resolves the issue by denying requests with unsupported multipart/form-data content type.&lt;/p&gt;</content:encoded>
      <guid isPermaLink="false">https://cve.radiocsirt.org/vuln/cve-2024-52805</guid>
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      <title>GHSA-rfq8-j7rh-8hf2 — Synapse allows unsupported content types to lead to memory exhaustion</title>
      <link>https://cve.radiocsirt.org/vuln/ghsa-rfq8-j7rh-8hf2</link>
      <description>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; PyPI: matrix-synapse&lt;/p&gt;
&lt;p&gt;### Impact&lt;/p&gt;
&lt;p&gt;In Synapse before 1.120.1, `multipart/form-data` requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks.&lt;/p&gt;
&lt;p&gt;### Patches&lt;/p&gt;
&lt;p&gt;Synapse 1.120.1 resolves the issue by denying requests with unsupported `multipart/form-data` content type.&lt;/p&gt;
&lt;p&gt;### Workarounds&lt;/p&gt;
&lt;p&gt;Limiting request sizes or blocking the `multipart/form-data` content type before the requests reach Synapse, for example in a reverse proxy, alleviates the issue. Another approach that mitigates the attack is to use a low `max_upload_size` in Synapse.&lt;/p&gt;
&lt;p&gt;### References&lt;/p&gt;
&lt;p&gt;- https://github.com/twisted/twisted/issues/4688#issuecomment-1167705518
- https://github.com/twisted/twisted/issues/4688#issuecomment-2385711609&lt;/p&gt;
&lt;p&gt;### For more information&lt;/p&gt;
&lt;p&gt;If you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).&lt;/p&gt;</description>
      <content:encoded>&lt;p&gt;&lt;strong&gt;Affected:&lt;/strong&gt; PyPI: matrix-synapse&lt;/p&gt;
&lt;p&gt;### Impact&lt;/p&gt;
&lt;p&gt;In Synapse before 1.120.1, `multipart/form-data` requests can in certain configurations transiently increase memory consumption beyond expected levels while processing the request, which can be used to amplify denial of service attacks.&lt;/p&gt;
&lt;p&gt;### Patches&lt;/p&gt;
&lt;p&gt;Synapse 1.120.1 resolves the issue by denying requests with unsupported `multipart/form-data` content type.&lt;/p&gt;
&lt;p&gt;### Workarounds&lt;/p&gt;
&lt;p&gt;Limiting request sizes or blocking the `multipart/form-data` content type before the requests reach Synapse, for example in a reverse proxy, alleviates the issue. Another approach that mitigates the attack is to use a low `max_upload_size` in Synapse.&lt;/p&gt;
&lt;p&gt;### References&lt;/p&gt;
&lt;p&gt;- https://github.com/twisted/twisted/issues/4688#issuecomment-1167705518
- https://github.com/twisted/twisted/issues/4688#issuecomment-2385711609&lt;/p&gt;
&lt;p&gt;### For more information&lt;/p&gt;
&lt;p&gt;If you have any questions or comments about this advisory, please email us at [security at element.io](mailto:security@element.io).&lt;/p&gt;</content:encoded>
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