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. CONFIDENTIALITY NOTICE: This e-mail message, including any attachments, is being sent by 3Com for the sole use of the intended recipient(s) and may contain confidential, proprietary and/or privileged information. Any unauthorized review, use, disclosure and/or distribution by any recipient is prohibited. If you are not the intended recipient, please delete and/or destroy all copies of this message regardless of form and any included attachments and notify 3Com immediately by contacting the sender via reply e-mail or forwarding to 3Com at postmaster (at) 3com (dot) com. [email concealed]