by Kastro
Paper/Archive/CVE-2025-53633

CVE-2025-53633

ctfer-io chall-manager — Chall-Manager's scenario decoding process does not check for zip bombs

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 44.7.447 × 208.9No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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.

Affected

ProductAffectedFixed inSource
chall-manager< 0.1.4–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: partial

References

refgithub.com/ctfer-io/chall-manager/security/advisories/GHSA-r7fm-3pqm-ww5wrefgithub.com/ctfer-io/chall-manager/commit/14042aa66a577caee777e10fe09adcf2587d20ddrefgithub.com/ctfer-io/chall-manager/releases/tag/v0.1.4