Critical severity · published May 5, 2021
CVE-2021-31800
Multiple path traversal vulnerabilities exist in smbserver.py in Impacket through 0.9.22
9.8
CVSS
19.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)19.4% · higher than 97% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FE
Fedora · Fedoraproject
32; 33; 34 · source: NVD
IM
Impacket · Secureauth
through 0.9.22 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-31800
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-31800
Third Party Advisory
https://github.com/SecureAuthCorp/impacket/blob/cb6d43a677c338db930bc4e9161620832c1ec624/impacket/smbserver.py#L2008
Third Party Advisory
https://github.com/SecureAuthCorp/impacket/blob/cb6d43a677c338db930bc4e9161620832c1ec624/impacket/smbserver.py#L2958
Third Party Advisory
https://github.com/SecureAuthCorp/impacket/blob/cb6d43a677c338db930bc4e9161620832c1ec624/impacket/smbserver.py#L3485
Third Party Advisory
https://github.com/SecureAuthCorp/impacket/blob/cb6d43a677c338db930bc4e9161620832c1ec624/impacket/smbserver.py#L876
Patch
https://github.com/SecureAuthCorp/impacket/commit/49c643bf66620646884ed141c94e5fdd85bcdd2f
Release Notes
https://github.com/SecureAuthCorp/impacket/releases
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