========================================================================== Ubuntu Security Notice USN-7444-1 April 22, 2025
matrix-synapse vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 22.04 LTS - Ubuntu 20.04 LTS - Ubuntu 18.04 LTS Summary: Several security issues were fixed in Synapse. Software Description: - matrix-synapse: Synapse: Matrix homeserver written in Python/Twisted. Details: It was discovered that Synapse network policies could be bypassed via specially crafted URLs. An attacker could possibly use this issue to bypass authentication mechanisms. (CVE-2023-32683) It was discovered that Synapse exposed cached device information. An attacker could possibly use this issue to gain access to sensitive information. (CVE-2023-43796) It was discovered that Synapse could be tricked into rejecting state changes in rooms. An attacker could possibly use this issue to cause Synapse to stop functioning properly, resulting in a denial of service. This issue was only fixed in Ubuntu 20.04 LTS and Ubuntu 22.04 LTS. (CVE-2022-39374) It was discovered that Synapse stored user credentials in a server's database temporarily. An attacker could possibly use this issue to gain access to sensitive information. This issue was only fixed in Ubuntu 22.04 LTS. (CVE-2023-41335) It was discovered that Synapse could incorrectly respond to server authorization events. An attacker could possibly use this issue to bypass authentication mechanisms. This issue was only fixed in Ubuntu 22.04 LTS. (CVE-2022-39335) It was discovered that Synapse could be manipulated to mark messages as read when they had not been viewed. An attacker could possibly use this issue to perform repudiation-based attacks. This issue was only fixed in Ubuntu 22.04 LTS. (CVE-2023-42453) It was discovered that Synapse had several memory-related issues. An attacker could possibly use this issue to cause Synapse to crash, resulting in a denial of service. This issue was only fixed in Ubuntu 22.04 LTS. (CVE-2024-31208) It was discovered that Synapse could run external tools due to a unchecked thumbnail rendering routine. An attacker could possibly use this issue to cause Synapse to crash, resulting in a denial of service, or execute arbitrary code. This issue was only fixed in Ubuntu 22.04 LTS. (CVE-2024-53863) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 22.04 LTS matrix-synapse 1.53.0-1ubuntu0.1~esm2 Available with Ubuntu Pro Ubuntu 20.04 LTS matrix-synapse 1.11.0-1ubuntu0.1~esm2 Available with Ubuntu Pro Ubuntu 18.04 LTS matrix-synapse 0.24.0+dfsg-1ubuntu0.1~esm4 Available with Ubuntu Pro After a standard system update you need to restart Synapse to make all the necessary changes. References: https://ubuntu.com/security/notices/USN-7444-1 CVE-2022-39335, CVE-2022-39374, CVE-2023-32683, CVE-2023-41335, CVE-2023-42453, CVE-2023-43796, CVE-2024-31208, CVE-2024-53863
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