CA BrightStor ARCServe BackUp Message Engine Remote Stack Overflow Vulnerability

Advisory Content :

hi full-disclosure,

CA BrightStor ARCServe BackUp Message Engine Remote Stack Overflow
Vulnerability

by cocoruder of Fortinet Security Research Team

http://ruder.cdut.net

Summary:

A remote stack overflow vulnerability exist in the RPC interface of CA
BrightStor ARCServe BackUp. An arbitrary anonymous attacker can execute
arbitrary code on the affected system by exploiting this vulnerability.

Affected Software Versions:

CA BrightStor ARCServe BackUp R11.5

Details::

The flaw specifically exits within the CA BrightStor Message Engine due to
incorrect handling of RPC requests on TCP port 6504. The interface is
identified by 506b1890-14c8-11d1-bbc3-00805fa6962e v1.0. Opnum 0x10d
specifies the vulnerable operation within this interface.

Function 0x10d's IDL as follows:

long sub_28EA5F70 (

[in] handle_t arg_1,

[in, out][size_is(256), length_is(1)] struct struct_2 * arg_2,

[in][string] char * arg_3,

[in][string] char * arg_4,

[in][string] char * arg_5,

[in][string] char * arg_6,

[in][string] char * arg_7,

[in] long arg_8,

[out][size_is(arg_1)] byte * arg_9

);

The following is the normal stub of this function:

my $stub=

"x00x01x00x00x00x00x00x00x01x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00x00".

"x00x00x00x00x00x00x00x00x00x00x00x00".

"x10x00x00x00x00x00x00x00". #point1: the victim's computer name

"x10x00x00x00".

"kkk-49ade5b31c1".

"x00".

"x09x00x00x00x00x00x00x00x09x00x00x00". #point2: a string,set it long

"Database".

"x00x00x00x00".

"x01x00x00x00x00x00x00x00x01x00x00x00".

"x00x00x00x00".

"x1ax00x00x00x00x00x00x00x1ax00x00x00".

"RemoteDatabaseMachineName".

"x00x00x00".

"x01x00x00x00x00x00x00x00x01x00x00x00".

"x00x79x49x6ex40x00x00x00";

When we set #point1 equal to the victim's computer name, and set #point2 is
a long string, there will cause a stack base overflow vulnerability. The
vulnerable code as follows:

.text:25604EF8 lea edx, [esp+120h+SubKey]

.text:25604EFC push offset asc_2561E2BC

.text:25604F01 push edx ;

.text:25604F02 call edi ; lstrcatA ;

.text:25604F04 lea eax, [esp+120h+SubKey]

.text:25604F08 push esi ;

.text:25604F09 push eax

.text:25604F0A call edi ; lstrcatA ; overflow!

Solution:

CA has released an advisory for this vulnerability which is available on:

http://supportconnectw.ca.com/public/storage/infodocs/basb-secnotice.asp

Fortinet advisory can be found at:

http://www.fortiguardcenter.com

CVE Information:

CVE-2007-5327

Disclosure Timeline:

2007.04.11 Vendor notified via email

2007.04.12 Vendor responded

2007.10.11 Final public disclosure

Disclaimer:

Although Fortinet has attempted to provide accurate information in

these materials, Fortinet assumes no legal responsibility for the

accuracy or completeness of the information. More specific information

is available on request from Fortinet. Please note that Fortinet's

product information does not constitute or contain any guarantee,

warranty or legally binding representation, unless expressly

identified as such in a duly signed writing.

Fortinet Security Research

secresearch (at) fortinet (dot) com [email concealed]

http://www.fortinet.com

Best Regards,

¡¡¡¡¡¡¡¡¡¡¡¡
61;¡¡¡Haifei Li

¡¡¡¡¡¡¡¡¡¡¡¡
61;¡¡¡hfli (at) fortinet (dot) com [email concealed]

¡¡¡¡¡¡¡¡¡¡¡¡
61;¡¡¡¡¡¡¡2007-10-11

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CA BrightStor ARCServe BackUp Message Engine Remote Stack Overflow Vulnerability