TPTI-07-10: Centennial Software XferWan.exe Stack Overflow Vulnerability http://dvlabs.tippingpoint.com/advisory/TPTI-07-10 June 4, 2007 -- CVE ID: CVE-2007-2514 -- Affected Vendor: Centennial Software -- Affected Products: Symantec Discovery 6.5 -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since April 3, 2007 by Digital Vaccine protection filter ID 5231. 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 software utilizing Centennial Software XferWan. Authentication is not required to exploit this vulnerability. The specific flaw exists during the parsing of overly long requests to the XferWAN process. When logging requests, user-supplied data is copied to the stack resulting in an exploitable buffer overflow condition. The following disassembly excerpt from the logging function demonstrates the issue: 004047A0 mov cl, Filename[eax] 004047A6 mov [esp+eax+890h+ExistingFileName], cl 004047AD inc eax 004047AE test cl, cl 004047B0 jnz short loc_4047A0 A lack of sanity checking on the size of 'Filename' results in an exploitable stack-based buffer overflow vulnerability that can result in a system compromise running under the context of the SYSTEM user. -- Vendor Response: Centennial has rectified an issue in the XFERWAN omponent of Centennial Discovery which could be remotely exploited by malicious people to compromise a system. This issue only affects systems running non-secure communications, which comprise a very small percentage of installations worldwide. Customers can find instructions on how to identify if they are susceptible to the vulnerability and correct, if necessary on the Centennial Customer Support website. -- Disclosure Timeline: 2007.03.07 - Vulnerability reported to vendor 2007.04.03 - Digital Vaccine released to TippingPoint customers 2007.06.04 - 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]