TPTI-07-13: Borland Interbase ibserver.exe Create-Request Buffer Overflow Vulnerability

TPTI-07-13: Borland Interbase ibserver.exe Create-Request Buffer
Overflow Vulnerability
http://dvlabs.tippingpoint.com/advisory/TPTI-07-13
http://dvlabs.tippingpoint.com/blog/1024/Step-by-Step-of-Discovery

July 24, 2007

– CVE ID:
CVE-2007-3566

– Affected Vendor:
Borland

– Affected Products:
Borland InterBase 2007

– TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability since February 1, 2007 by Digital Vaccine protection
filter ID 5066. For further product information on the TippingPoint IPS:

http://www.tippingpoint.com 

– Vulnerability Details:
This vulnerability allows remote attackers to execute arbitrary code on
vulnerable installations of Borland Interbase. Authentication is not
required to exploit this vulnerability.

The specific flaw exists within the database service, ibserver.exe,
which binds to TCP port 3050. The service receives socket data in the
following format:

[4-byte request][request arguments][data]

A vulnerability exists in Interbase when specifying a "create" request
(0x14). The request is broken down as such:

[0x00000014][4-byte id][4-byte size][data]

The vulnerability exists during an inline string copy operation.

0x0043A0C5 mov     ecx, [ebp+var_8D8]
0x0043A0CB and     ecx, 0FFFFh
0x0043A0D1 mov     esi, [ebp+arg_8]
0x0043A0D4 mov     edi, [ebp+var_1C]
0x0043A0D7 mov     eax, ecx
0x0043A0D9 shr     ecx, 2
0x0043A0DC rep movsd

Where ecx is our 4-byte size, esi is our data, and edi a stack pointer.
When a large value is specified in the size, the associate data is
copied to the stack resulting in a classic overflow. With enough data
the SEH pointer can be compromised and arbitrary code execution is
trivial.

– Vendor Response:
Borland has released InterBase 2007 SP2 which addresses this
vulnerability. More details can be found at:

http://www.codegear.com/downloads/regusers/interbase

– Disclosure Timeline:
2007.01.31 - Vulnerability reported to vendor
2007.02.01 - Digital Vaccine released to TippingPoint customers
2007.07.24 - Coordinated public release of advisory

– Credit:
This vulnerability was discovered by Cody Pierce, TippingPoint DVLabs.

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