Another quiet week, but Microsoft will make its monthly announcement of new vulnerabilities on Tuesday.
@RISK is the SANS community's consensus bulletin summarizing the most important vulnerabilities and exploits identified during the past week and providing guidance on appropriate actions to protect your systems (PART I). It also includes a comprehensive list of all new vulnerabilities discovered in the past week (PART II).
******************** Security Training Update ************************
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New Orleans offers a whole new type of program that many people have asked us to provide: 18 one and two day courses on issues shaping the future of information security, from the newest hacker tools to changes in legal issues surrounding security. Perfect for people who have taken SANS courses and want updates and for people who just don't have time to attend a full class. On the other hand, Washington offers 13 full length immersion courses an a few short courses.
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Part I is compiled by the security team at TippingPoint (www.tippingpoint.com) as a by-product of that company's continuous effort to ensure that its intrusion prevention products effectively block exploits using known vulnerabilities. TippingPoint's analysis is complemented by input from a council of security managers from twelve large organizations who confidentially share with SANS the specific actions they have taken to protect their systems. A detailed description of the process may be found at http://www.sans.org/newsletters/cva/#process
Description: Microsoft Word reportedly contains an overflow that can be triggered by a specially crafted Word document header. The flaw may be exploited to overwrite large amount of memory; hence, it may be possible to exploit the flaw to execute arbitrary code (not confirmed). A webpage serving a malicious Word document, or an email with a malicious Word attachment, may leverage the flaw to compromise a client. The technical details regarding the flaw have been publicly posted. Note that Internet Explorer automatically opens a Word document, which makes it easy to exploit the vulnerability via HTTP.
Status: Microsoft has not confirmed, no updates available.
Council Site Actions: Most of the council sites are waiting for confirmation and patches from Microsoft. One site said they may consider disabling using MS Word as an email editor in Outlook if attacks appear in the wild. One site relies on the users using Microsoft Office Update to update their own systems.
Description: IBM's DB2 database, which enjoys a significant share of the database market, contains more than 15 buffer overflow vulnerabilities. These flaws may be exploited to execute arbitrary code and compromise the database server. The discoverers of the flaws have not released any technical details yet, but have rated many of the flaws as "High" and one of the flaws as "Critical". Judging by other advisories from the discoverers, their ratings imply that some of the flaws may be exploited by remote unauthenticated attackers, or attackers with limited privileges. The administrators should patch their DB2 servers on a priority basis. The technical details are scheduled to be posted in January 2005. Some information about the flaws may be obtained by reviewing the IBM "APAR" list.
Status: IBM has confirmed, patches available.
Council Site Actions: Two of the reporting council sites responded to this item. They are trying to determine whether the affected versions are in use.
Description: Apple's QuickTime, a popular digital media player for Windows and Mac platforms, contains a heap-based buffer overflow. The problem lies in the QuickTime's BMP image processing, and may be exploited to execute arbitrary code on a client system. A webpage serving a malicious QuickTime media file may leverage this flaw to compromise a client. Note that users who have QuickTime as their default media player may be compromised via any of the media file formats. No technical details have been posted. The overflow may be similar to other BMP decoding overflows discovered earlier in the Qt package.
Status: Apple released a cumulative security update on Sept 30, 2004 that fixes this and other vulnerabilities.
Council Site Actions: Three of the reporting council sites responded to this issue. One site has already pushed out the patch and the second site is in process of pushing out the patch. The third site relies on Apple's Software Update facility to distribute patches and does not plan to launch a remediation effort to ensure all systems receive the patch.
Description: Microsoft's ASP.NET software is used to create dynamic web-based applications. The software reportedly runs on 2.9 million web servers. ASP.NET contains a vulnerability that may be exploited to bypass Forms-based authentication or Windows-based authentication to obtain an unauthorized access to password protected files on the web server. The authentication checks can be bypassed by accessing the password protected files directly via an HTTP request that contains a "\" (backslash) or "%5c" (hex encoded backslash), instead of a "/" in the URL. It is reported that inserting "%20" (hex encoded space) in the URL also bypasses the authentication checks. An attacker may exploit the flaw to obtain sensitive information that may be used to further compromise the web server.
Status: Microsoft is investigating the flaw. Web administrators are advised to apply "ASP.NET ValidatePath" module to their web servers.
Council Site Actions: Two of the reporting sites are waiting for final confirmation from Microsoft. Another site is investigating whether they have any APS.NET implementations. A fourth site is in process of modifying code on their .NET apps and will deploy the patch within a week or two. The last site will rely on the public Windows Update site or their local SUS server for deployment of patches when they become available.
Description: Vypress Messenger is designed for Windows intranets and supports delivery of text messages. The messenger contains a buffer overflow in a "visualization" function that can be triggered by a message with an overlong (over 776 bytes) "#1" field. The flaw can be exploited to execute arbitrary code with the privileges of the messenger application. Note that the messenger supports broadcast messages. Hence, an attacker in the intranet can possibly compromise all the messenger clients via a single UDP broadcast packet. Proof of concept exploit has been posted.
Status: Vendor confirmed, upgrade to version 4.0 RC1.
Council Site Actions: The affected software is not in production or widespread use at any of the council sites. They reported that no action was necessary.
Description: BlackBoard, a PHP-based bulletin board software, contains a remote file include vulnerability in its checkdb.inc.php script. The problem occurs because the user-supplied value to the "libpath" parameter is not properly sanitized. The flaw can be exploited by an attacker to execute arbitrary PHP scripts on the BlackBoard server. The attacker would need to create a malicious "_more.php" script in the "lang" directory on a web server under his control to exploit this flaw.
Status: Vendor confirmed, apply patch 1.5.1-h.
Council Site Actions: The affected software is not in production or widespread use at any of the council sites. They reported that no action was necessary.
Description: Simple Authentication and Security Layer (SASL) provides a general framework that can be used by protocols like IMAP or SMTP for authentication purposes. Cyrus-SASL library is a popular SASL implementation which is used by widely deployed software such as sendmail. The library contains a buffer overflow in processing MD5 digests that may be exploited to execute arbitrary code with the privileges of the application using the Cyrus-SASL library. The technical details regarding the overflow can be obtained by diffing the digestmda5.c file between the patched and the unpatched versions.
Status: Vendor confirmed, upgrade to version 2.1.19. Gentoo and other Linux distributions have also provided updated packages.
Council Site Actions: One site is still in the process of determining if the affected version is bundled within the sendmail versions they have in use. A second site is running the Cyrus-SASL sendmail but not in the vulnerable configuration. A third site has Cyrus-SASL in use in multiple packages. Some of their systems have already been updated and some updates are still in progress. For the Mac OS systems, they rely on Apple's Software Update utility; thus the patch will be distributed shortly after its release from the vendor.
Description: An exploit has been published to leverage the buffer overflow vulnerability in the Ipswitch Whatsup Gold product. The exploit works on Windows 2000/XP systems and spawns a command shell on port 28876.
Council Site Updates: Only one council site provided an update - they have already patched their systems.
Council Site Updates: Two council sites have provided an update. One site has already patched their systems. The second site have a small number of Tru64 UNIX systems, but Mozilla is rarely used, if ever. Thus they don't plan to take any action.
Council Site Updates: One site provided an update - they have patched their affected systems.
This list is compiled by Qualys ( www.qualys.com ) as part of that company's ongoing effort to ensure its vulnerability management web service tests for all known vulnerabilities that can be scanned. As of this week Qualys scans for 3758 unique vulnerabilities. For this special SANS community listing, Qualys also includes vulnerabilities that cannot be scanned remotely.
(c) 2004. All rights reserved. The information contained in this newsletter, including any external links, is provided "AS IS," with no express or implied warranty, for informational purposes only. In some cases, copyright for material in this newsletter may be held by a party other than Qualys (as indicated herein) and permission to use such material must be requested from the copyright owner.
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