Synapse up to 1.24.x .well-known resource consumption

Summaryinfo

A vulnerability classified as problematic has been found in Synapse up to 1.24.x. Affected is an unknown function of the file .well-known. The manipulation leads to resource consumption. This vulnerability is uniquely identified as CVE-2021-21274. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in Synapse up to 1.24.x. It has been rated as problematic. This issue affects some unknown processing of the file .well-known. The manipulation with an unknown input leads to a resource consumption vulnerability. Using CWE to declare the problem leads to CWE-400. The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources. Impacted is availability.

The weakness was disclosed 02/26/2021. The advisory is shared at github.com. The identification of this vulnerability is CVE-2021-21274. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

The vulnerability scanner Nessus provides a plugin with the ID 251152 (Linux Distros Unpatched Vulnerability : CVE-2021-21274), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 1.25.0 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying a patch is able to eliminate this problem. The bugfix is ready for download at github.com. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (251152). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Name

• Synapse

Version

• 1.0
• 1.1
• 1.2
• 1.3
• 1.4
• 1.5
• 1.6
• 1.7
• 1.8
• 1.9
• 1.10
• 1.11
• 1.12
• 1.13
• 1.14
• 1.15
• 1.16
• 1.17
• 1.18
• 1.19
• 1.20
• 1.21
• 1.22
• 1.23
• 1.24

License

• open-source

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

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CVSSv4info

CVSSv3info

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Exploitinginfo

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Entryinfo

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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