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Flag: Tornado! Hurricane!

Topic created on: September 18, 2007 04:56 CDT by ero .

They announced flayer in a post on Google Security's blog.
The paper detailing the tool was presented on woot07.

Just wondering if anyone has played with it and has some thoughts to share.

jms		September 18, 2007 11:23.10 CDT
Haven't played with this tool yet, but it looks interesting.

LordMole		September 22, 2007 13:16.43 CDT
it gave me some ideas. it makes it easy to confirm how crappy some protection mechanisms are. this is a script for auto-skipping flexlm on ICC (available for free anyhow) #!/bin/bash # icc_crack.sh: icc uses flexlm. This traces functions involved in the # license check and forcibly skips the final validation (on success). # Setup stuff from icc's run script INTEL_LICENSE_FILE="" INSTALLDIR=/path/to/cc/9.1.038 LD_LIBRARY_PATH="$INSTALLDIR/lib:${LD_LIBRARY_PATH}" DYLD_LIBRARY_PATH="$INSTALLDIR/lib:${DYLD_LIBRARY_PATH}"; PATH="$INSTALLDIR/bin:${PATH}"; export PATH DYLD_LIBRARY_PATH LD_LIBRARY_PATH INSTALLDIR INTEL_LICENSE_FILE export -n IA32ROOT; unset IA32ROOT; # grabbed from the web # ----------------------------------------------------- # The HOSTID -- [DEMO\|ANY\|HOSTNAME=$HOSTNAME\|USER=$USER]? # uncounted -- no need for a server. # 1-jan-0 -- default infinite license. # 1-jan-1990 from $(strings iccbin) # 9999.9999 is an arbitrarily high version number # "CCompL" was given by FlexLM error messages # "intel" wad just guessed cat <<EOF > $INSTALLDIR/bin/cracked.lic INCREMENT CCompL intel 9999.9999 1-jan-0 \\ uncounted permanent \\ HOSTID=ANY ISSUED=1-jan-1990 ISSUER=lordMOLE NOTICE="Enjoy" \\ SN=00000000000000000000000000000000 START=1-jan-1990 \\ SIGN=010101010101 EOF function cleanup() { rm /tmp/icc.log &> /dev/null rm icctest.c icctest &> /dev/null } trap cleanup EXIT # run icc once under flayer tainting the license file echo "!! performing exploratory run" valgrind --tool=flayer --log-file-exactly=/tmp/icc.log --taint-file=yes \ --file-filter="$INSTALLDIR/bin/cracked.lic" \ --xml=yes \ $INSTALLDIR/bin/iccbin &> /dev/null # get the instruction pointers and see if any are calls we can step over. echo "!! extracting interesting instruction pointers" ips=$(grep \<ip\> /tmp/icc.log \| # Grab the ips from the xml output cut -f2 -d\> \| cut -f1 -d\< \| grep 0x8 \| sort \| uniq -c \| sort -rn \| head -30 \| # top 30 tr -s ' ' \| cut -f3 -d' ' \| sed 's/$.*$/\1:1\n\1:0/g') # make a test C file cat <<EOF > icctest.c #include <stdio.h> int main() { return printf("cracked\n"); } EOF echo "!! $(echo $ips \| wc -w) candidates identified" # Brute force our way to freedom! trap "" ERR cmd="" p=("." "o" "0" "o" "."); r=0 echo -n "!! " for action in $ips; do # no need to trace - use mkf cmd="mkf --alter-fn=$action $INSTALLDIR/bin/iccbin" echo -en "${p[$((r%5))]}${p[$((r+1%5))]}${p[$((r+2%5))]}${p[$((r+3%5))]}" (command $cmd icctest.c -o icctest &> /dev/null;:) if [[ -f icctest ]]; then echo -en "\r!! cracked in $r attempts" break fi r=$((r+1)) action="" done echo if [[ ! -z "$action" ]]; then echo "!! creating icc-cracked" echo "#!/bin/bash" > icc-cracked export >> icc-cracked echo "$cmd \"\$@\"" >> icc-cracked chmod +x icc-cracked echo -e " . o\n __m_v_m__ thanks you for your patronage\n lord MOLE" exit 0 else echo "!! bad luck" exit 1 fi

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