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.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - 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. (CVE-2021-31800)

Note that Nessus relies on the presence of the package as reported by the vendor.

There are packages installed that are affected by a vulnerability referenced in the following CVE:

  - 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. (CVE-2021-31800)

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the b692a49c-9ae7-4958-af21-cbf8f5b819ea advisory.

  - 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. (CVE-2021-31800)

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

ID	Name	Product	Family	Type	Severity
257204	Linux Distros Unpatched Vulnerability : CVE-2021-31800	Nessus	Misc.	Local	critical
416994	SCA: security update for impacket (GHSA-mj63-64x7-57xf)	Tenable Cloud Security	SCA Checks	Local	critical
416994	SCA: security update for impacket (GHSA-mj63-64x7-57xf)	Tenable Self-Hosted Container Security	SCA Checks	Local	critical
406670	Alpine: multiple py3-impacket packages: security update to 0.9.23-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	critical
406670	Alpine: multiple py3-impacket packages: security update to 0.9.23-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	critical
174294	FreeBSD : py-impacket -- multiple path traversal vulnerabilities (b692a49c-9ae7-4958-af21-cbf8f5b819ea)	Nessus	FreeBSD Local Security Checks	Local	critical

Detections

Analytics

CVE-2021-31800

critical

Tenable Plugins

critical

critical

critical

critical

critical

critical