Advisory Published

USN-7444-1: Synapse vulnerabilities

First published: Tue Apr 22 2025(Updated: )

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)

Affected SoftwareAffected VersionHow to fix
All of
ubuntu/matrix-synapse<1.53.0-1ubuntu0.1~esm2
1.53.0-1ubuntu0.1~esm2
Ubuntu=22.04
All of
ubuntu/matrix-synapse<1.11.0-1ubuntu0.1~esm2
1.11.0-1ubuntu0.1~esm2
Ubuntu=20.04
All of
ubuntu/matrix-synapse<0.24.0+dfsg-1ubuntu0.1~esm4
0.24.0+dfsg-1ubuntu0.1~esm4
Ubuntu=18.04

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Reference Links

Child vulnerabilities

(Contains the following vulnerabilities)

Frequently Asked Questions

  • What is the severity of USN-7444-1?

    USN-7444-1 has been classified as a high severity vulnerability due to its potential to bypass authentication mechanisms.

  • How do I fix USN-7444-1?

    To fix USN-7444-1, you should upgrade your matrix-synapse package to the specified remedy versions for your Ubuntu release.

  • What vulnerabilities are addressed in USN-7444-1?

    USN-7444-1 addresses multiple vulnerabilities including CVE-2023-32683 and CVE-2023-41335, among others.

  • Which versions of Ubuntu are affected by USN-7444-1?

    USN-7444-1 affects Ubuntu versions 22.04, 20.04, and 18.04.

  • What can an attacker achieve by exploiting USN-7444-1?

    An attacker exploiting USN-7444-1 could potentially bypass authentication mechanisms and access cached device information.

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