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A simple regreSSHion (CVE-2024-6387) checker written in bash. This makes use of nc however if nc is unavailable it reverts to making use of /dev/tcp
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| #!/bin/bash | |
| # Copyright 2024 Keiran 'Affix' Smith | |
| # | |
| # Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated | |
| # documentation files (the “Software”), to deal in the Software without restriction, including without limitation | |
| # the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, | |
| # and to permit persons to whom the Software is furnished to do so, subject to the following conditions: | |
| # The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. | |
| # | |
| # THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO | |
| # THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | |
| # AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, | |
| # TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. | |
| safe_ver=( | |
| "SSH-2.0-OpenSSH_8.9p1 Ubuntu-3ubuntu0.10" | |
| "SSH-2.0-OpenSSH_9.3p1 Ubuntu-3ubuntu3.6" | |
| "SSH-2.0-OpenSSH_9.6p1 Ubuntu-3ubuntu13.3" | |
| "SSH-2.0-OpenSSH_9.3p1 Ubuntu-1ubuntu3.6" | |
| "SSH-2.0-OpenSSH_9.2p1 Debian-2+deb12u3" | |
| "SSH-2.0-OpenSSH_8.4p1 Debian-5+deb11u" | |
| ) | |
| echo "Super simple regreSSHion (CVE-2024-6387) checker" | |
| echo "Written by Keiran 'Affix' Smith <opensource_at_keiran.scot>" | |
| if [ $# -ne 1 ]; then | |
| echo "Usage: $0 <IP/domain>" | |
| exit 1 | |
| fi | |
| usenc=1 | |
| if ! [ -x "$(command -v nc)" ]; then | |
| echo 'Error: nc is not installed, Using /dev/tcp' >&2 | |
| usenc=0 | |
| fi | |
| doCheck() { | |
| versionstr="" | |
| if ! [ usenc ]; then | |
| versionstr=$(echo "" > /dev/tcp/$1/22 | head -n 1) | |
| else | |
| versionstr=$(echo "" | nc -w 2 $1 22 | head -n 1) | |
| fi | |
| version=$(echo $versionstr | awk '{print $1}' | cut -d '_' -f 2 | cut -d 'p' -f 1 | tr -d $'\r') | |
| if [ -z "$version" ]; then | |
| return | |
| fi | |
| if [[ ${safe_ver[@]} =~ $versionstr ]]; then | |
| return | |
| fi | |
| if [ 1 -eq $(echo "$version <= 4.4" | bc -l) ]; then | |
| echo -e "\e[1m\e[31m[VULNERABLE] $i\t: $version : $versionstr\e[0m" | |
| return | |
| fi | |
| if [ 1 -eq "$(echo "$version >= 8.5" | bc -l)" ]; then | |
| if [ 1 -eq "$(echo "$version < 9.8" | bc -l)" ]; then | |
| echo -e "\e[1m\e[31m[VULNERABLE] $1\t: $version : $versionstr\e[0m" | |
| return | |
| fi | |
| fi | |
| } | |
| for i in `dig +short A $1`; do | |
| doCheck $i | |
| done |
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