@RISK will be arriving on Monday instead of at the end of the week. We hope that will allow it to be even more useful to you.
@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).
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Part I is compiled by Rohit Dhamankar at TippingPoint, a division of 3Com, 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: Embedding fonts in a document guarantees that a user receiving the document can successfully read it. Embedded Open Type file Format (".eot") can be used to bundle a font in a webpage, and Internet Explorer opens the eot files automatically. The library responsible for parsing EOT files, T2EMBED.DLL, contains a heap-based overflow that can be triggered by a specially crafted EOT file. The problem arises because the declared size of the uncompressed block in a EOT file is used to allocate memory for the uncompressed data; however, the actual uncompressed data size is not compared to the declared size prior to writing the section in the heap memory. A malicious webpage can exploit the overflow to execute arbitrary code on a user's system when the page is viewed using Internet Explorer. The technical details and the code disassembly that can be used to craft an exploit have been publicly posted. Immunity has also made proof of concept exploits available to its partners. Note that the exploitation vectors for the vulnerability are similar to the widely exploited WMF flaw, and the extension for EOT files can be spoofed.
Status: Apply the patch referenced in the Microsoft Security Bulletin MS06-002. Other vendors like Nortel and Avaya have published patches for their affected products.
Council Site Actions: All reporting council sites are responding to this item. Several sites have already distributed the patch and others plan to deploy during their next scheduled maintenance window. A few sites are using Microsoft Automatic Updates and hence the patch has already been installed.
Description: Microsoft Outlook and Exchange use Transport Neutral Encapsulation Format (TNEF) to handle e-mails written in Rich Text Format. The library responsible for decoding the TNEF format contains a buffer overflow that can be triggered by a specially crafted e-mail. The flaw can be exploited to execute arbitrary code with "SYSTEM" privileges in case of the Exchange server. Note that for compromising the Exchange server sending an email is sufficient i.e. no user interaction is required. The discoverers of the flaw have reported that they will disclose the technical details in another 3 months.
Status: Apply the patch referenced in the Microsoft Security Bulletin MS06-003.
Council Site Actions: All reporting council sites are responding to this item. Several sites have already distributed the patch and others plan to deploy during their next scheduled maintenance window. A few sites are using Microsoft Automatic Updates and hence the patch has already been installed.
Description: The QuickTime media player from Apple contains multiple buffer overflow vulnerabilities in processing the following file formats: GIF, MOV, QTIF, JPEG, TGA, TIFF and PICT. A specially crafted movie or image file can exploit the overflows to execute arbitrary code on the client system. Note that the malicious files can be hosted on a webpage, shared folder, P2P folder or sent in an email. The technical details required to craft exploits are included in the posted advisories.
Status: Apple has released QuickTime 7.0.4 to address these issues. Note that iTunes uses QuickTime for playing media. Hence, iTunes users should also apply this update.
Council Site Actions: Most of the council sites are responding to this item and are in the process of pushing the patch or plan to push the patch during their next regularly scheduled system maintenance window. Some sites are using Apple's Software Update facility and the patch has already been installed.
Status: Novell has released an update to address the issue. Block access to the remote manager HTTP port(s) from the Internet as a general security measure. References : iDefense Advisory http://www.idefense.com/intelligence/vulnerabilities/display.php?id=371 Novell Advisory http://www.checksum.org/cso/message/14774.html Product Homepage http://www.novell.com/products/linuxenterpriseserver/ Novell Remote Manager Documentation http://www.novell.com/documentation/oes/index.html?page=/documentation/oes/remot
emgr_lx/data/btmt2a5.html SecurityFocus BID http://www.securityfocus.com/bid/16226
Description: ClamAV is an open-source antivirus software designed mainly for scanning emails on UNIX mail gateways. The software includes a virus scanning library - libClamAV. This library is used by many third party email, web, FTP scanners as well as mail clients. The library contains a buffer overflow that can be triggered by a specially crafted UPX packed executable file. The attacker can send the malicious file via email, web, FTP or a file share, and exploit the buffer overflow to execute arbitrary code on the system running the ClamAV library. The technical details can be obtained by comparing the fixed and the affected versions of the software. Note that for compromising the mail/web/FTP gateways no user interaction is required.
Council Site Actions: The affected software and/or configuration are not in production or widespread use, or are not officially supported at any of the council sites. They reported that no action was necessary.
Description: WinProxy proxy suite is designed for secure sharing of a Internet connection for small to medium businesses. The WinProxy web proxy server contains a stack-based buffer overflow that can be triggered by an overlong HTTP "Host" header. An attacker can exploit the flaw to execute arbitrary code. Exploit code has been publicly posted.
Status: WinProxy version 6.1a has been released to address this buffer overflow as well as other DoS issues.
Council Site Actions: The affected software and/or configuration are not in production or widespread use, or are not officially supported at any of the council sites. They reported that no action was necessary.
Description: auth_ldap module provides LDAP authentication for Apache servers on Windows and UNIX platforms. This module contains a format string vulnerability that can be triggered by supplying a specially crafted username during the LDAP authentication process. An attacker can exploit the flaw to execute arbitrary code on the Apache server with the privileges of the "apache" process. The technical details required to craft an exploit can be gathered by examining the fixed and the vulnerable code.
Status: Vendor has released version 1.6.1. Linux vendors such as Red Hat have also released their own updates.
Council Site Actions: Two of the reporting council sites are using the affected software. One site is awaiting the patch and will install during their next regularly scheduled system update cycle. The second site is still assessing and will likely handle at next scheduled maintenance window.
Description: CERT has notified of a malicious website that is exploiting a vulnerability in Sun JRE (reported in November 2004). This is the first report of an active exploitation for this vulnerability. Please ensure that the Sun JRE is updated to the latest version.
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 4771 unique vulnerabilities. For this special SANS community listing, Qualys also includes vulnerabilities that cannot be scanned remotely.
(c) 2006. 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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