ZDI-08-005: Novell Client NWSPOOL.DLL EnumPrinters Stack Overflow Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-08-005.html February 11, 2008 -- CVE ID: CVE-2008-0639 -- Affected Vendor: Novell -- Affected Products: Novell Netware Client -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability by Digital Vaccine protection filter ID . 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. The EnumPrinters function exposed by this DLL contains a logical flaw allowing an attacker to bypass a patch introduced to prevent the vulnerability described in ZDI-07-045. Exploitation of this vulnerability leads to arbitrary code execution in the context of the SYSTEM user. -- Vendor Response: Novell has issued an update to correct this vulnerability. More details can be found at: http://download.novell.com/Download?buildid=SszG22IIugM~ -- Disclosure Timeline: 2007.12.11 - Vulnerability reported to vendor 2008.02.11 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by Anonymous and Avosani Gabriele. -- About the Zero Day Initiative (ZDI): Established by TippingPoint, 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) 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@3com.com. _______________________________________________ Full-Disclosure - We believe in it. Charter: http://lists.grok.org.uk/full-disclosure-charter.html Hosted and sponsored by Secunia - http://secunia.com/