[NT] BakBone NetVault Reporter Scheduler Heap Overflow Vulnerability

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BakBone NetVault Reporter Scheduler Heap Overflow Vulnerability
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SUMMARY

" <http://www.bakbone.com/product.aspx?id=1404> NetVault Report Manager
provides file system and backup reporting for single or multi-server
environments from one common interface." Vulnerability in BakBone NetVault
Reporter allows arbitrary code execution on the vulnerable system.

DETAILS

Vulnerable Systems:
* BakBone NetVault Reporter 3.5 before Update4 installed.

The specific flaw exists both within the scheduler client
(clsscheduler.exe) listening on TCP port 7978 and the scheduler server
(srvscheduler.exe) listening on TCP port 7977. In both cases an
exploitable heap corruption can occur during the processing of overly long
filename arguments to the "GET" and "POST" requests. Code execution is
possible under the context of the SYSTEM user.

When searching for a termination/whitespace character ("\r\t\n") a heap
chunk is being used to hold the data. Due to the lack of bounds checking
on this heap chunk an overflow occurs when a long string without any of
the above special characters are encountered. The vulnerable code appears
below.

0x00466C07 mov al, [esi+ebp]
0x00466C0A cmp al, 20h
0x00466C0C jz short loc_466C84
0x00466C0E cmp al, 9
0x00466C10 jz short loc_466C84
0x00466C12 cmp al, 0Ah
0x00466C14 jz short loc_466C84
0x00466C16 cmp al, 0Dh
0x00466C18 jz short loc_466C84
0x00466C1A push 1
0x00466C1C inc esi
0x00466C1D push 1
0x00466C1F lea edx, [esi+ebp] ; heap chunk
0x00466C22 push edx ; readfds
0x00466C23 mov ecx, edi
0x00466C25 call sub_4645C0 ; recv 1 byte
0x00466C2A cmp eax, 0FFFFFFFFh
0x00466C2D mov [ebx+272Ch], eax
0x00466C33 jnz short loc_466C07 ;loop

Vendor Response:
BakBone has addressed this issue in NetVault Report Manager v3.5 Update4
available for download from:
<http://www.bakbone.com/products/downloads/default.asp>

http://www.bakbone.com/products/downloads/default.asp

Disclosure Timeline:
* 2007.02.23 - Vulnerability reported to vendor
* 2007.07.25 - Public release of advisory

CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-3911>
CVE-2007-3911

ADDITIONAL INFORMATION

The information has been provided by ZDI.
The original article can be found at:
<http://www.zerodayinitiative.com/advisories/ZDI-07-044.html>

http://www.zerodayinitiative.com/advisories/ZDI-07-044.html

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