ZDI-07-045: Novell Client NWSPOOL.DLL Stack Overflow Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-07-045.html August 6, 2007 -- CVE ID: Pending Assignment -- Affected Vendor: Novell -- Affected Products: Novell Netware Client -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since July 30, 2007 by Digital Vaccine protection filter ID 5262, 5266. For further product information on the TippingPoint IPS: http://www.tippingpoint.com -- Vulnerability Details: This vulnerability allows remote attackers to execute arbitrary code on systems with vulnerable installations of the Novell Netware Client. Authentication is not required to exploit this vulnerability. The specific flaw exists in nwspool.dll which is responsible for handling RPC requests through the spoolss named pipe. Several RPC functions exposed by this DLL do not properly verify argument sizes and subsequently copy user-supplied data to a stack-based buffer resulting in an exploitable overflow. -- Vendor Response: Novell has issued an update to correct this vulnerability. More details can be found at: http://support.novell.com/docs/Readmes/InfoDocument/patchbuilder/readme_5005400.html -- Disclosure Timeline: 2007.02.16 - Vulnerability reported to vendor 2007.07.30 - Digital Vaccine released to TippingPoint customers 2007.08.06 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by an anonymous researcher. -- 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: http://www.zerodayinitiative.com 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. CONFIDENTIALITY NOTICE: This e-mail message, including any attachments,is being sent by 3Com for the sole use of the intended recipient(s) andmay 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, pleasedelete and/or destroy all copies of this message regardless of form andany included attachments and notify 3Com immediately by contacting thesender via reply e-mail or forwarding to 3Com at postmaster@xxxxxxxxx
