CVE-2025-53633: chall-manager — Fix

Description

Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player. When decoding a scenario (i.e. a zip archive), the size of the decoded content is not checked, potentially leading to zip bombs decompression. 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 14042aa and shipped in v0.1.4.

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CVSS v3.1 Score

9.8

CRITICAL

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Weakness Type (CWE)

CWE-405 CWE-405

Affected Products

Vendor	Product	Versions
ctfer-io	chall-manager	< 0.1.4

References

Advisories & Patches

https://github.com/ctfer-io/chall-manager/commit/14042aa66a577caee777e10fe09adcf2587d20dd https://github.com/ctfer-io/chall-manager/security/advisories/GHSA-r7fm-3pqm-ww5w

Other References

https://github.com/ctfer-io/chall-manager/releases/tag/v0.1.4

Frequently Asked Questions

What is CVE-2025-53633? +

Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player. When decoding a scenario (i.e. a zip archive), the size of the decoded content is not checked, potentially leading to zip bombs decompression. 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 14042aa and shipped in v0.1.4. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2025-53633? +

CVE-2025-53633 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-53633? +

CVE-2025-53633 affects products from ctfer-io, specifically: chall-manager. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-53633? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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