Arch Linux Security Advisory ASA-202107-56 ========================================== Severity: Medium Date : 2021-07-21 CVE-ID : CVE-2021-31800 Package : impacket Type : directory traversal Remote : Yes Link : https://security.archlinux.org/AVG-1916 Summary ======= The package impacket before version 0.9.23-1 is vulnerable to directory traversal. Resolution ========== Upgrade to 0.9.23-1. # pacman -Syu "impacket>=0.9.23-1" The problem has been fixed upstream in version 0.9.23. Workaround ========== None. Description =========== Multiple path traversal vulnerabilities exist in smbserver.py in Impacket before version 0.9.23. 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. Impact ====== A malicious SMB client connecting to the example SMB server provided by Impacket could read or modify arbitrary files on the server through directory traversal. References ========== https://bugs.archlinux.org/task/70714 https://github.com/SecureAuthCorp/impacket/pull/1066 https://github.com/SecureAuthCorp/impacket/commit/99bd29e3995c254e2d6f6c2e34... https://security.archlinux.org/CVE-2021-31800