exploit the possibilities
Home Files News &[SERVICES_TAB]About Contact Add New

shk-004.txt

shk-004.txt
Posted Apr 2, 2007
Authored by M. Shirk

Computer Associates (CA) Brightstor Backup suffers from a remote code execution vulnerability in Mediasvr.exe.

tags | advisory, remote, code execution
SHA-256 | 3f5b72ba1d741c2f1af11dd43b6615839776262ab1ae08113f6424e968ce231f

shk-004.txt

Change Mirror Download

[Shirkdog Security Advisory SHK-004]

Title:
------
Computer Associates (CA) Brightstor Backup Mediasvr.exe Remote Code
Vulnerability

Description of Application:
---------------------------
http://www3.ca.com/solutions/ProductFamily.aspx?ID=115

Brightstor ARCserv Backup provides a complete, flexible and integrated
backup and recovery solution for Windows, NetWare, Linux and UNIX
environments.

Vulnerability(PoC):
-------------------
There seems to be an design error in the handling of RPC data with xdr
procedures across several .dll's imported by Mediasvr.exe. Four bytes from
an RPC packet are processed as a particular address (xdr_handle_t data which
is run through multiple bit shifts, and reversing of bytes), and eventually
loaded into ECX. The 191 (0xbf) procedure, followed by nulls (at least 8
bytes of nulls, which may be Null Credentials and Auth?) leads to an
exploitable condition.

.text:0040AACD 008 mov ecx, [esp+8]
.text:0040AAD1 008 mov dword_418820, esi
.text:0040AAD7 008 push offset dword_418820
.text:0040AADC 00C mov eax, [ecx]
.text:0040AADE 00C call dword ptr [eax+2Ch]

At this point, you have control of ECX (esp+8 is your address data). The
data from the packet is stored in memory and is relatively static (see
NOTE). The address is then loaded into EAX, and then called as EAX+2Ch,
which is controllable data from the packet. In this code, I just jump ahead
to the portbinding shellcode.
The following exploit opens up a shell on port 4444:

http://www.shirkdog.us/camediasvrremote.py


Impact:
----------
This vulnerability leads to remote code execution.

Risk Level:
--------------
Critical

Solution:
------------
CA has been notified

References:
--------------

[Shirkdog Security]
http://www.shirkdog.us/shk-004.html


Shirkdog
' or 1=1--
http://www.shirkdog.us

_________________________________________________________________
i'm making a difference. Make every IM count for the cause of your choice.
Join Now.
http://clk.atdmt.com/MSN/go/msnnkwme0080000001msn/direct/01/?href=http://im.live.com/messenger/im/home/?source=hmtagline

Login or Register to add favorites

File Archive:

March 2024

  • Su
  • Mo
  • Tu
  • We
  • Th
  • Fr
  • Sa
  • 1
    Mar 1st
    16 Files
  • 2
    Mar 2nd
    0 Files
  • 3
    Mar 3rd
    0 Files
  • 4
    Mar 4th
    32 Files
  • 5
    Mar 5th
    28 Files
  • 6
    Mar 6th
    42 Files
  • 7
    Mar 7th
    17 Files
  • 8
    Mar 8th
    13 Files
  • 9
    Mar 9th
    0 Files
  • 10
    Mar 10th
    0 Files
  • 11
    Mar 11th
    15 Files
  • 12
    Mar 12th
    19 Files
  • 13
    Mar 13th
    21 Files
  • 14
    Mar 14th
    38 Files
  • 15
    Mar 15th
    15 Files
  • 16
    Mar 16th
    0 Files
  • 17
    Mar 17th
    0 Files
  • 18
    Mar 18th
    10 Files
  • 19
    Mar 19th
    32 Files
  • 20
    Mar 20th
    46 Files
  • 21
    Mar 21st
    16 Files
  • 22
    Mar 22nd
    13 Files
  • 23
    Mar 23rd
    0 Files
  • 24
    Mar 24th
    0 Files
  • 25
    Mar 25th
    12 Files
  • 26
    Mar 26th
    31 Files
  • 27
    Mar 27th
    19 Files
  • 28
    Mar 28th
    42 Files
  • 29
    Mar 29th
    0 Files
  • 30
    Mar 30th
    0 Files
  • 31
    Mar 31st
    0 Files

Top Authors In Last 30 Days

File Tags

Systems

packet storm

© 2022 Packet Storm. All rights reserved.

Services
Security Services
Hosting By
Rokasec
close