Image Processing Vulnerability in Synapse Matrix Homeserver by Element
CVE-2024-53863
What is CVE-2024-53863?
Synapse, an open-source Matrix homeserver, has an image processing vulnerability that impacts versions prior to 1.120.1. When certain options like dynamic_thumbnail are enabled, the server may incorrectly handle uncommon image formats, leading to potential invocation of external processing tools such as Ghostscript. This flaw expands the attack surface, raising significant security concerns due to the unusual nature of the affected formats in typical web usage. The latest update to version 1.120.1 mitigates this risk by limiting thumbnail generation to commonly used image formats including PNG, JPEG, GIF, and WebP, thus enhancing the security posture of the Synapse homeserver.
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