CVE-2021-31800

Description

Multiple path traversal vulnerabilities exist in smbserver.py in Impacket through 0.9.22. An attacker that connects to a running smbserver instance can list and write to arbitrary files via ../ directory traversal. This could potentially be abused to achieve arbitrary code execution by replacing /etc/shadow or an SSH authorized key.

How to fix CVE-2021-31800

To remediate CVE-2021-31800, upgrade the affected package to a fixed version below.

• —upgrade to 0.9.22-2 or later
• —upgrade to 0.9.23 or later
• —upgrade to 49c643bf66620646884ed141c94e5fdd85bcdd2f or later

Is CVE-2021-31800 being exploited?

Moderate — EPSS is 39.8%. Track this CVE but it's not at the top of the prioritisation list.

Affected packages (3)

• from 0, < 0.9.22-2
• from 0, < 0.9.23
• from 0, < 49c643bf66620646884ed141c94e5fdd85bcdd2f | >= 0.9.10, < 0.9.23

CVSS scores

References (19)

• ADVISORYgithub.com/advisories/GHSA-mj63-64x7-57xf
• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-31800
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-31800
• PATCHgithub.com/fortra/impacket
• WEB