Bug 1957426 (CVE-2021-31800) - CVE-2021-31800 python-impacket: Multiple path traversal vulnerabilities in smbserver.py
Summary: CVE-2021-31800 python-impacket: Multiple path traversal vulnerabilities in sm...
Keywords:
Status: CLOSED UPSTREAM
Alias: CVE-2021-31800
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Red Hat Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 1957427 1957428
Blocks: 1957429
TreeView+ depends on / blocked
 
Reported: 2021-05-05 18:34 UTC by Pedro Sampaio
Modified: 2021-05-05 20:34 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed: 2021-05-05 20:34:06 UTC
Embargoed:

Attachments (Terms of Use)

Description Pedro Sampaio 2021-05-05 18:34:39 UTC 
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.

References:

https://github.com/SecureAuthCorp/impacket/blob/cb6d43a677c338db930bc4e9161620832c1ec624/impacket/smbserver.py#L2008
https://github.com/SecureAuthCorp/impacket/releases
https://github.com/SecureAuthCorp/impacket/blob/cb6d43a677c338db930bc4e9161620832c1ec624/impacket/smbserver.py#L876
https://github.com/SecureAuthCorp/impacket/blob/cb6d43a677c338db930bc4e9161620832c1ec624/impacket/smbserver.py#L2958
https://github.com/SecureAuthCorp/impacket/commit/49c643bf66620646884ed141c94e5fdd85bcdd2f
https://github.com/SecureAuthCorp/impacket/blob/cb6d43a677c338db930bc4e9161620832c1ec624/impacket/smbserver.py#L3485
Comment 1 Pedro Sampaio 2021-05-05 18:35:10 UTC 
Created python-impacket tracking bugs for this issue:

Affects: epel-all [bug 1957428]
Affects: fedora-all [bug 1957427]
Comment 2 Product Security DevOps Team 2021-05-05 20:34:06 UTC 
This CVE Bugzilla entry is for community support informational purposes only as it does not affect a package in a commercially supported Red Hat product. Refer to the dependent bugs for status of those individual community products.
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