CVE-2021-31800

medium

Published 2021-06-18 · Modified 2023-11-08

💬 Discuss on Community ✚ Propose mitigation

CVSS v3

—

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v4 NEW

—

not yet in upstream

VIR risk

5.5

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.

Predictions

Exploit likelihood

30%

Patch ETA

—

Heuristic predictions, AS-IS, for prioritization only.

Mitigations

No mitigations published for this CVE yet.

The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.

✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here with source_tier=community-verified.

OS impact

OS	Version	Status	Fixed in
arch		fixed	`0.9.23-1`
sles		affected
debian	bookworm	fixed	`0.9.22-2`
debian	bullseye	fixed	`0.9.22-2`
debian	forky	fixed	`0.9.22-2`
debian	sid	fixed	`0.9.22-2`
debian	trixie	fixed	`0.9.22-2`

Package impact

Ecosystem	Package	Vulnerable	Fixed
PyPI	impacket	`<0.9.23`	`0.9.23`
PyPI	impacket	`<49c643bf66620646884ed141c94e5fdd85bcdd2f\|\|>=0.9.10,<0.9.23`	`49c643bf66620646884ed141c94e5fdd85bcdd2f`

References

Community-verified mitigations for this CVE will appear above when contributors publish them.

Verify integrity in audit chain (admin only). AS-IS.