ZDI-07-044: BakBone NetVault Reporter Scheduler Heap Overflow Vulnerability Jul 25 2007 07:21PM
zdi-disclosures 3com com
ZDI-07-044: BakBone NetVault Reporter Scheduler Heap Overflow



July 25, 2007

-- CVE ID:


-- Affected Vendor:


-- Affected Products:

BakBone NetVault Reporter 3.5 < Update4

-- TippingPoint(TM) IPS Customer Protection:

TippingPoint IPS customers have been protected against this

vulnerability since July 24, 2007 by Digital Vaccine protection

filter ID 5215. For further product information on the TippingPoint IPS:


-- Vulnerability Details:

This vulnerability allows remote attackers to execute arbitrary code on

systems with affected installations of BakBone NetVault Reporter. User

interaction is not required to exploit this vulnerability.

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:


-- Disclosure Timeline:

2007.02.23 - Vulnerability reported to vendor

2007.07.24 - Digital Vaccine released to TippingPoint customers

2007.07.25 - Public release of advisory

-- Credit:

This vulnerability was discovered by Tenable Network Security.

-- About the Zero Day Initiative (ZDI):

Established by TippingPoint, a division of 3Com, The Zero Day Initiative

(ZDI) represents a best-of-breed model for rewarding security

researchers for responsibly disclosing discovered vulnerabilities.

Researchers interested in getting paid for their security research

through the ZDI can find more information and sign-up at:


The ZDI is unique in how the acquired vulnerability information is used.

3Com does not re-sell the vulnerability details or any exploit code.

Instead, upon notifying the affected product vendor, 3Com provides its

customers with zero day protection through its intrusion prevention

technology. Explicit details regarding the specifics of the

vulnerability are not exposed to any parties until an official vendor

patch is publicly available. Furthermore, with the altruistic aim of

helping to secure a broader user base, 3Com provides this vulnerability

information confidentially to security vendors (including competitors)

who have a vulnerability protection or mitigation product.

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