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Changes in some places. #44

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Changes in some places. #44

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34 changes: 16 additions & 18 deletions bashcheck
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Original file line number Diff line number Diff line change
@@ -1,35 +1,33 @@
#!/bin/bash

warn() {
if [ "$scary" == "1" ]; then
echo -e "\033[91mVulnerable to $1\033[39m"
else
echo -e "\033[93mFound non-exploitable $1\033[39m"
fi
[ "$scary" == 1 ] && echo -e "\033[91mVulnerable to $1\033[39m" || {
echo -e "\033[93mFound non-exploitable $1\033[39m"
}
}

good() {
pass() {
echo -e "\033[92mNot vulnerable to $1\033[39m"
}

tmpdir=`mktemp -d -t tmp.XXXXXXXX`

[ -n "$1" ] && bash=$(which $1) || bash=$(which bash)
echo -e "\033[95mTesting $bash ..."
$bash -c 'echo "Bash version $BASH_VERSION"'
[ -n "$1" ] && bash=$(which "$1") || bash=$(which bash)
echo -e "\033[95mBash path: $bash."
$bash -c 'echo "Bash version: $BASH_VERSION."'
echo -e "\033[39m"

#r=`a="() { echo x;}" $bash -c a 2>/dev/null`
if [ -n "$(env 'a'="() { echo x;}" $bash -c a 2>/dev/null)" ]; then
if [ -n "$(env 'a'="() { echo x; }" $bash -c a 2>/dev/null)" ]; then
echo -e "\033[91mVariable function parser active, maybe vulnerable to unknown parser bugs\033[39m"
scary=1
elif [ -n "$(env 'BASH_FUNC_a%%'="() { echo x;}" $bash -c a 2>/dev/null)" ]; then
elif [ -n "$(env 'BASH_FUNC_a%%'="() { echo x; }" $bash -c a 2>/dev/null)" ]; then
echo -e "\033[92mVariable function parser pre/suffixed [%%, upstream], bugs not exploitable\033[39m"
scary=0
elif [ -n "$(env 'BASH_FUNC_a()'="() { echo x;}" $bash -c a 2>/dev/null)" ]; then
elif [ -n "$(env 'BASH_FUNC_a()'="() { echo x; }" $bash -c a 2>/dev/null)" ]; then
echo -e "\033[92mVariable function parser pre/suffixed [(), redhat], bugs not exploitable\033[39m"
scary=0
elif [ -n "$(env '__BASH_FUNC<a>()'="() { echo x;}" $bash -c a 2>/dev/null)" ]; then
elif [ -n "$(env '__BASH_FUNC<a>()'="() { echo x; }" $bash -c a 2>/dev/null)" ]; then
echo -e "\033[92mVariable function parser pre/suffixed [__BASH_FUNC<..>(), apple], bugs not exploitable\033[39m"
scary=0
else
Expand All @@ -42,15 +40,15 @@ r=`env x="() { :; }; echo x" $bash -c "" 2>/dev/null`
if [ -n "$r" ]; then
warn "CVE-2014-6271 (original shellshock)"
else
good "CVE-2014-6271 (original shellshock)"
pass "CVE-2014-6271 (original shellshock)"
fi

pushd $tmpdir > /dev/null
env x='() { function a a>\' $bash -c echo 2>/dev/null > /dev/null
if [ -e echo ]; then
warn "CVE-2014-7169 (taviso bug)"
else
good "CVE-2014-7169 (taviso bug)"
pass "CVE-2014-7169 (taviso bug)"
fi
popd > /dev/null

Expand All @@ -60,7 +58,7 @@ grep AddressSanitizer $tmpdir/bashcheck.tmp > /dev/null
if [ $? == 0 ] || [ $ret == 139 ]; then
warn "CVE-2014-7186 (redir_stack bug)"
else
good "CVE-2014-7186 (redir_stack bug)"
pass "CVE-2014-7186 (redir_stack bug)"
fi


Expand All @@ -75,7 +73,7 @@ $($bash -c "f(){ x(){ _;};x(){ _;}<<a;}" 2>/dev/null)
if [ $? != 0 ]; then
warn "CVE-2014-6277 (lcamtuf bug #1)"
else
good "CVE-2014-6277 (lcamtuf bug #1)"
pass "CVE-2014-6277 (lcamtuf bug #1)"
fi

if [ -n "$(env x='() { _;}>_[$($())] { echo x;}' $bash -c : 2>/dev/null)" ]; then
Expand All @@ -85,7 +83,7 @@ elif [ -n "$(env BASH_FUNC_x%%='() { _;}>_[$($())] { echo x;}' $bash -c : 2>/dev
elif [ -n "$(env 'BASH_FUNC_x()'='() { _;}>_[$($())] { echo x;}' $bash -c : 2>/dev/null)" ]; then
warn "CVE-2014-6278 (lcamtuf bug #2)"
else
good "CVE-2014-6278 (lcamtuf bug #2)"
pass "CVE-2014-6278 (lcamtuf bug #2)"
fi

rm -rf $tmpdir