SoftEtherVPN up to 5.02.5183 Request Packet resource consumption

Summaryinfo

A vulnerability classified as problematic has been found in SoftEtherVPN up to 5.02.5183. Affected by this issue is some unknown functionality of the component Request Packet Handler. The manipulation leads to resource consumption. This vulnerability is referenced as CVE-2024-38520. Remote exploitation of the attack is possible. No exploit is available. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability was found in SoftEtherVPN up to 5.02.5183. It has been rated as critical. This issue affects some unknown processing of the component Request Packet Handler. 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 summary by CVE is:

SoftEtherVPN is a an open-source cross-platform multi-protocol VPN Program. When SoftEtherVPN is deployed with L2TP enabled on a device, it introduces the possibility of the host being used for amplification/reflection traffic generation because it will respond to every packet with two response packets that are larger than the request packet size. These sorts of techniques are used by external actors who generate spoofed source IPs to target a destination on the internet. This vulnerability has been patched in version 5.02.5185.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2024-38520 since 06/18/2024. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

Upgrading to version 5.02.5185 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch c2a7aa548137dc80c6aafdc645cf4dc34e0dc764 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.

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Productinfo

Name

• SoftEtherVPN

Version

• 5.02.5183

License

• open-source

Website

• Product: https://github.com/SoftEtherVPN/SoftEtherVPN/

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