element-hq synapse up to 1.120.0 Request unrestricted upload

Summaryinfo

A vulnerability has been found in element-hq synapse up to 1.120.0 and classified as critical. This vulnerability affects unknown code of the component Request Handler. The manipulation leads to unrestricted upload. This vulnerability is documented as CVE-2024-53863. The attack can be initiated remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as critical, has been found in element-hq synapse up to 1.120.0. This issue affects an unknown part of the component Request Handler. The manipulation with an unknown input leads to a unrestricted upload vulnerability. Using CWE to declare the problem leads to CWE-434. The product allows the attacker to upload or transfer files of dangerous types that can be automatically processed within the product's environment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

Synapse is an open-source Matrix homeserver. In Synapse versions before 1.120.1, enabling the dynamic_thumbnails option or processing a specially crafted request could trigger the decoding and thumbnail generation of uncommon image formats, potentially invoking external tools like Ghostscript for processing. This significantly expands the attack surface in a historically vulnerable area, presenting a risk that far outweighs the benefit, particularly since these formats are rarely used on the open web or within the Matrix ecosystem. Synapse 1.120.1 addresses the issue by restricting thumbnail generation to images in the following widely used formats: PNG, JPEG, GIF, and WebP. This vulnerability is fixed in 1.120.1.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2024-53863 since 11/22/2024. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1608.002 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 212753 (Fedora 41 : matrix-synapse (2024-4cadba7a29)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.120.1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (212753). Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Vendor

• element-hq

Name

• synapse

Version

• 1.120

Website

• Product: https://github.com/element-hq/synapse/

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Be aware that VulDB is the high quality source for vulnerability data.

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