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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 =========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2007.0253 -- [Win][Netware][Linux] Novell Groupwise WebAccess Base64 Decoding Stack Overflow Vulnerability 19 April 2007 =========================================================================== AusCERT Security Bulletin Summary --------------------------------- Product: Novell Groupwise WebAccess 7.0.1 and prior Publisher: 3Com Operating System: Windows Linux variants Netware Impact: Execute Arbitrary Code/Commands Access: Remote/Unauthenticated CVE Names: CVE-2007-2171 Original Bulletin: http://www.zerodayinitiative.com/advisories/ZDI-07-015.html http://download.novell.com/Download?buildid=8RF83go0nZg~ http://download.novell.com/Download?buildid=O9ucpbS1bK0~ Comment: A buffer overflow vulnerability in handling authentication requests allows an unauthenticated attacker to compromise the server remotely. - --------------------------BEGIN INCLUDED TEXT-------------------- ZDI-07-015: Novell Groupwise WebAccess Base64 Decoding Stack Overflow Vulnerability http://www.zerodayinitiative.com/advisories/ZDI-07-015.html April 18, 2007 - -- CVE ID: CVE-2007-2171 - -- Affected Vendor: Novell - -- Affected Products: Groupwise WebAccess - -- TippingPoint(TM) IPS Customer Protection: TippingPoint IPS customers have been protected against this vulnerability since April 19, 2007 by Digital Vaccine protection filter ID 5295. 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 Novell Groupwise WebAccess. Authentication is not required to exploit this vulnerability. The specific flaw exists in the GWINTER.exe process bound by default on TCP ports 7205 and 7211. During the handling of an HTTP Basic authentication request, the process copies user-supplied base64 data into a fixed length stack buffer. Sending at least 336 bytes will trigger a stack based buffer overflow due to a vulnerable base64_decode() call. Exploitation of this issue can result in arbitrary code execution. - -- Vendor Response: Novell has issued an update to correct this vulnerability. More details can be found at: http://download.novell.com/Download?buildid=8RF83go0nZg~ http://download.novell.com/Download?buildid=O9ucpbS1bK0~ - -- Disclosure Timeline: 2007.03.19 - Vulnerability reported to vendor 2007.04.18 - Coordinated public release of advisory 2007.04.19 - Digital Vaccine released to TippingPoint customers - -- Credit: This vulnerability was discovered by Tenable Network Security. - -- 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. - --------------------------END INCLUDED TEXT-------------------- You have received this e-mail bulletin as a result of your organisation's registration with AusCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. 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If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: http://www.auscert.org.au/render.html?cid=1980 If you believe that your computer system has been compromised or attacked in any way, we encourage you to let us know by completing the secure National IT Incident Reporting Form at: http://www.auscert.org.au/render.html?it=3192 =========================================================================== Australian Computer Emergency Response Team The University of Queensland Brisbane Qld 4072 Internet Email: auscert@auscert.org.au Facsimile: (07) 3365 7031 Telephone: (07) 3365 4417 (International: +61 7 3365 4417) AusCERT personnel answer during Queensland business hours which are GMT+10:00 (AEST). On call after hours for member emergencies only. =========================================================================== -----BEGIN PGP SIGNATURE----- Comment: http://www.auscert.org.au/render.html?it=1967 iQCVAwUBRibBfih9+71yA2DNAQJcLwQAivb8LYsXfVtK+dEommgOSPmKHR5cDwEk ROXgOQOS1W9H835RuiuvBvRRcjPj+USZDt8qMWzVcGvf2lI6/T1BOScNaTouW028 ZzN5cmsknyNCugpH3RmDmsif1GHOYGo2W2o11D3ycLAGygeZL/bSD6MFBJs+13/4 fUTdhUtJSKI= =5E5n -----END PGP SIGNATURE-----