Bugsink is vulnerable to Path Traversal attacks via event_id in ingestion

Vulnerability Description

Bugsink is a self-hosted error tracking service. In versions 1.4.2 and below, 1.5.0 through 1.5.4, 1.6.0 through 1.6.3, and 1.7.0 through 1.7.3, ingestion paths construct file locations directly from untrusted event_id input without validation. A specially crafted event_id can result in paths outside the intended directory, potentially allowing file overwrite or creation in arbitrary locations. Submitting such input requires access to a valid DSN, potentially exposing them. If Bugsink runs in a container, the effect is confined to the container’s filesystem. In non-containerized setups, the overwrite may affect other parts of the system accessible to that user. This is fixed in versions 1.4.3, 1.5.5, 1.6.4 and 1.7.4.

References

• https://github.com/bugsink/bugsink/security/advisories/GHSA-q78p-g86f-jg6q
• https://github.com/bugsink/bugsink/commit/1001726f4389e982c486cdd5fa81941cb46cfc33
• https://github.com/bugsink/bugsink/commit/211ddf76758c808c095b5f836c363f148d934d21
• https://github.com/bugsink/bugsink/commit/2c41fbe3881bdea83399a7f9fdc8cff198ae089f
• https://github.com/bugsink/bugsink/commit/53cf1a17a3e96f7c83c7451fd56f980a09d0c9b0
• https://github.com/bugsink/bugsink/commit/55a155003d0b416ea008c5e7dcde85130ad21d9b
• https://github.com/bugsink/bugsink/commit/b94aa8a5c96ce8cdd9711b6beb4e518264993ac2
• https://github.com/bugsink/bugsink/commit/c341687bd655543730c812db35c29199f788be6b
• https://github.com/bugsink/bugsink/commit/c87217bd565122ba70af90436e3ab2cd9bee658f