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.
Advisories
Source ID Title
EUVD EUVD EUVD-2025-21052 Chall-Manager's HTTP Gateway is vulnerable to DoS due to missing header timeout
Github GHSA Github GHSA GHSA-ggmv-j932-q89q Chall-Manager's HTTP Gateway is vulnerable to DoS due to missing header timeout
Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Thu, 14 Aug 2025 20:45:00 +0000

Type Values Removed Values Added
First Time appeared Ctfer-io
Ctfer-io chall-manager
CPEs cpe:2.3:a:ctfer-io:chall-manager:*:*:*:*:*:*:*:*
Vendors & Products Ctfer-io
Ctfer-io chall-manager
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00095}

epss

{'score': 0.00113}


Fri, 11 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00095}


Thu, 10 Jul 2025 21:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Thu, 10 Jul 2025 20:00:00 +0000

Type Values Removed Values Added
Description 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.
Title Chall-Manager's HTTP Gateway have no header check timeout leading to potential slow loris attacks
Weaknesses CWE-770
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}


cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2025-07-10T20:26:58.612Z

Reserved: 2025-07-07T14:20:38.390Z

Link: CVE-2025-53634

cve-icon Vulnrichment

Updated: 2025-07-10T20:26:55.512Z

cve-icon NVD

Status : Analyzed

Published: 2025-07-10T20:15:27.987

Modified: 2025-08-14T20:41:40.660

Link: CVE-2025-53634

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.