ctfer-io chall-manager up to 0.1.3 allocation of resources

Summaryinfo

A vulnerability was found in ctfer-io chall-manager up to 0.1.3. It has been classified as critical. This vulnerability affects unknown code. The manipulation leads to allocation of resources. This vulnerability is referenced as CVE-2025-53634. Remote exploitation of the attack is possible. No exploit is available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in ctfer-io chall-manager up to 0.1.3. This issue affects an unknown code block. The manipulation with an unknown input leads to a allocation of resources vulnerability. Using CWE to declare the problem leads to CWE-770. The product allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor. Impacted is availability. The summary by CVE is:

Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player. The HTTP Gateway processes headers, but with no timeout set. With a slow loris attack, an attacker could cause Denial of Service (DoS). Exploitation does not require authentication nor authorization, so anyone can exploit it. It should nonetheless not be exploitable as it is highly recommended to bury Chall-Manager deep within the infrastructure due to its large capabilities, so no users could reach the system. Patch has been implemented by commit 1385bd8 and shipped in v0.1.4.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2025-53634 since 07/07/2025. 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 T1499 according to MITRE ATT&CK.

Upgrading to version 0.1.4 eliminates this vulnerability. The upgrade is hosted for download at github.com. Applying the patch 1385bd869142651146cd0b123085f91cec698636 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

Vendor

• ctfer-io

Name

• chall-manager

Version

• 0.1.0
• 0.1.1
• 0.1.2
• 0.1.3

License

• open-source

Website

• Product: https://github.com/ctfer-io/chall-manager/

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