Published: 05/05/2021 Updated: 07/11/2023

CVSS v2 Base Score: 7.5 | Impact Score: 6.4 | Exploitability Score: 10

CVSS v3 Base Score: 9.8 | Impact Score: 5.9 | Exploitability Score: 3.9

VMScore: 668

Vector: AV:N/AC:L/Au:N/C:P/I:P/A:P

Multiple path traversal vulnerabilities exist in smbserver.py in Impacket up to and including 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.

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secureauth impacket
fedoraproject fedora 32
fedoraproject fedora 33
fedoraproject fedora 34

Debian Bug report logs - #988141 impacket: CVE-2021-31800 Package: src:impacket; Maintainer for src:impacket is Debian Python Team <team+python@trackerdebianorg>; Reported by: Salvatore Bonaccorso <carnil@debianorg> Date: Thu, 6 May 2021 15:24:01 UTC Severity: important Tags: security, upstream Found in version ...

Multiple path traversal vulnerabilities exist in smbserverpy in Impacket through 0922 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 ...

A path traversal in smbserver.py allows an attacker to read/write arbitrary files on the server.

CVE-2021-31800 - Impacket SMB Server Arbitrary file read/write CVSS Vector: CVSS:31/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Score: 99 (Critical) Description A path traversal in smbserverpy allows an attacker to read/write arbitrary files on the server Detailed explanation of this issue: checkmarxcom/blog/cve-2021-31800-how-we-used-impacket-to-hack-itself/ Usage

CWE-22 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 https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UF56LYB27LHEIFJTFHU3M75NMNNK2SCG/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/KRV2C5DATXBHG6TF6CEEX54KZ75THQS3/https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IPXDPWCAPVX3UWYZ3N2T5OLBSBBUHJP6/https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=988141 https://nvd.nist.gov https://github.com/p0dalirius/CVE-2021-31800-Impacket-SMB-Server-Arbitrary-file-read-write

CVE-2021-31800

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