Core Security - Corelabs Advisory
http://corelabs.coresecurity.com/

Artweaver Buffer Overflow Vulnerability


1. *Advisory Information*

Title: Artweaver Buffer Overflow Vulnerability
Advisory ID: CORE-2013-0701
Advisory URL:
http://www.coresecurity.com/advisories/artweaver-buffer-overflow-vulnerability
Date published: 2013-07-22
Date of last update: 2013-07-22
Vendors contacted: Artweaver
Release mode: Coordinated release


2. *Vulnerability Information*

Class: Buffer overflow [CWE-119]
Impact: Code execution
Remotely Exploitable: Yes
Locally Exploitable: No
CVE Name: CVE-2013-2576


3. *Vulnerability Description*

Artweaver [1], [2] is prone to a security vulnerability when processing
AWD files. This vulnerability could be exploited by a remote attacker to
execute arbitrary code on the target machine by enticing Artweaver users
to open a specially crafted file.


4. *Vulnerable Packages*

   . Artweaver v3.1.5.
   . Older versions are probably affected too, but they were not checked.


5. *Non-Vulnerable Packages*

   . Artweaver v3.1.6.
   . Artweaver v4.0.


6. *Vendor Information, Solutions and Workarounds*

Vendor notifies that Artweaver v3.1.6 and v4.0 are available and fix the
reported vulnerability. Vendor encourages all Artweaver users to update
to the latest version:

   1. http://www.artweaver.de/en/help/68
   2. Artweaver Plus - http://www.artweaver.de/en/help/80
   3. Artweaver Free - http://www.artweaver.de/en/help/81


7. *Credits*

This vulnerability was discovered and researched by Daniel Kazimirow
from Core Exploit Writers Team. The publication of this advisory was
coordinated by Fernando Miranda from Core Advisories Team.


8. *Technical Description / Proof of Concept Code*

Below is shown the result of opening the maliciously crafted file
'CORE-2013-0701-artweaver-poc-28ab190b137f3.AWD'[3], which means the
normal execution flow can be altered in order to execute arbitrary code.

/-----
004F3265    8B45 FC         MOV EAX,DWORD PTR SS:[EBP-4]
004F3268    8B40 28         MOV EAX,DWORD PTR DS:[EAX+28]
004F326B    8B10            MOV EDX,DWORD PTR DS:[EAX]
004F326D    FF12            CALL DWORD PTR DS:[EDX]                  ;
<--- crash

DS:[45454545]=???

EAX 030F9C48 ASCII
"EEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEEE
ECX 019983F0
EDX 45454545
EBX 019983F0
ESP 0012FB7C
EBP 0012FB90
ESI 00000000
EDI 00000013
EIP 004F326D Artweave.004F326D
C 0  ES 0023 32bit 0(FFFFFFFF)
P 1  CS 001B 32bit 0(FFFFFFFF)
A 0  SS 0023 32bit 0(FFFFFFFF)
Z 0  DS 0023 32bit 0(FFFFFFFF)
S 0  FS 003B 32bit 7FFDF000(FFF)
T 0  GS 0000 NULL
D 0
O 0  LastErr ERROR_SUCCESS (00000000)
EFL 00010206 (NO,NB,NE,A,NS,PE,GE,G)
ST0 empty -??? FFFF 00005FEE 0F0566FB
ST1 empty -??? FFFF 00000000 0F05070D
ST2 empty -??? FFFF 00000000 00060010
ST3 empty -??? FFFF 00000000 002C006F
ST4 empty -NAN FFFF 8F669BF5 EFE5EDFD
ST5 empty 6.0925232094539560960e+16
ST6 empty -7.8331661972355807100e+18
ST7 empty 5.8691123250627328000e+16
               3 2 1 0      E S P U O Z D I
FST 0020  Cond 0 0 0 0  Err 0 0 1 0 0 0 0 0  (GT)
FCW 1372  Prec NEAR,64  Mask    1 1 0 0 1 0
-----/


9. *Report Timeline*
. 2013-07-04:
Core Security Technologies notifies the Artweaver team of the
vulnerability.

. 2013-07-05:
Vendor asks for a report with technical information.

. 2013-07-05:
Technical details sent to Artweaver team. Core notifies that the
publication date is scheduled for the end of July.

. 2013-07-06:
Vendor reproduces the buffer overrun and notifies that they are looking
for the cause of the problem.

. 2013-07-10:
Vendor notifies that this vulnerability will be fixed with the next
Artweaver update v3.1.6, scheduled for July 20th.

. 2013-07-10:
Core re-schedules the advisory publication for Monday 22nd.

. 2013-07-20:
Vendor notifies patched versions were released and aditional information
for Artweaver users. [Sec. 6]

. 2013-07-22:
Advisory CORE-2013-0701 released.


10. *References*

[1] http://www.artweaver.de.
[2] http://www.b-e-soft.com/products#artweaver.
[3]
http://www.coresecurity.com/system/files/attachments/2013/07/CORE-2013-0701-artweaver-poc-28ab190b137f3.zip
http://www.exploit-db.com/sploits/27047.zip

11. *About CoreLabs*

CoreLabs, the research center of Core Security Technologies, is charged
with anticipating the future needs and requirements for information
security technologies. We conduct our research in several important
areas of computer security including system vulnerabilities, cyber
attack planning and simulation, source code auditing, and cryptography.
Our results include problem formalization, identification of
vulnerabilities, novel solutions and prototypes for new technologies.
CoreLabs regularly publishes security advisories, technical papers,
project information and shared software tools for public use at:
http://corelabs.coresecurity.com.


12. *About Core Security Technologies*

Core Security Technologies enables organizations to get ahead of threats
with security test and measurement solutions that continuously identify
and demonstrate real-world exposures to their most critical assets. Our
customers can gain real visibility into their security standing, real
validation of their security controls, and real metrics to more
effectively secure their organizations.

Core Security's software solutions build on over a decade of trusted
research and leading-edge threat expertise from the company's Security
Consulting Services, CoreLabs and Engineering groups. Core Security
Technologies can be reached at +1 (617) 399-6980 or on the Web at:
http://www.coresecurity.com.


13. *Disclaimer*

The contents of this advisory are copyright (c) 2013 Core Security
Technologies and (c) 2013 CoreLabs, and are licensed under a Creative
Commons Attribution Non-Commercial Share-Alike 3.0 (United States)
License: http://creativecommons.org/licenses/by-nc-sa/3.0/us/


14. *PGP/GPG Keys*

This advisory has been signed with the GPG key of Core Security
Technologies advisories team, which is available for download at
http://www.coresecurity.com/files/attachments/core_security_advisories.asc.