Microsoft has three components with critical vulnerabilities this week but don't let your focus on fixing Microsoft problems cause you to miss the critical Oracle problems and the Firefox Javascript vulnerability. Alan
@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 for this issue has been compiled by Rohan Kotian 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: The Microsoft Office Web Components are a collection of Component Object Model (COM) controls used for manipulating office documents. There is a memory corruption vulnerability in some of the ActiveX controls that are installed by default by Microsoft Office. The specific flaw is in the Spreadsheet ActiveX control "OWC10.DLL" and "OWC11.DLL". A malicious web page that instantiates the vulnerable component could trigger this vulnerability and execute arbitrary code with the privileges of the current user. The users will have to be tricked into visiting the website that hosts such a web page, typically by persuading them to click on the links in e-mail messages. Some technical details are publicly available for this vulnerability, along with public proof-of-concepts.
Status: Vendor confirmed, no updates available. Users can mitigate the impact of this vulnerability by disabling the affected controls via Microsoft's "killbit" mechanism for CLSIDs "0002E541-0000-0000-C000-000000000046", "0002E559-0000-0000-C000-000000000046".
Description: Microsoft DirectX is a multimedia framework for its Windows operating system and its component, the DirectShow, is used for streaming media on Windows with the ability to capture and playback high quality streams. Microsoft DirectShow has been identified with multiple vulnerabilities. A specially crafted QuickTime file when opened by a Windows Media Player might trigger one of these vulnerabilities. The first issue is a Null Byte overwrite in the DirectShow component caused due to improper parsing of QuickTime media files. The second issue is caused due to improper validation of certain values when DirectShow updates a pointer. The third issue is caused due to inadequate checking of the "NumberOfEntries" field while parsing QuickTime atoms. Successful exploitation might lead to arbitrary code execution. Technical details are not available publicly.
Status: Vendor confirmed, updates available.
Description: Embedded OpenType (EOT) fonts are a compact form of fonts designed for use with Office documents or with Web pages. EOT ensures that the users view the document exactly the way its author had intended them. The library responsible for parsing EOT files "T2EMBED.DLL" has been identified with multiple vulnerabilities. A specially crafted EOT font can be used to trigger one of these vulnerabilities. The first issue is a heap based buffer vulnerability in "T2EMBED.DLL" caused due to integer truncation on specific length value. The second issue is caused due to an integer overflow error in EOT engine while parsing name tables contained in files that had the EOT fonts. Successful exploitation might allow an attacker to execute arbitrary code. An attacker will have to entice the user on visiting the web pages that has specially crafted EOT font content.
Status: Vendor confirmed, updates available.
Description: Firefox is an open source web browser based on Mozilla codebase and had 22.51% of the recorded usage share among the web browsers as of May 2009. There is a memory corruption error in Mozilla Firefox's JavaScript engine. The specific flaw appears to reside within the "TraceMonkey" part of the JavaScript engine. A specially crafted web page, when parsed by a vulnerable browser, will trigger the vulnerability. Successful exploitation might allow an attacker to execute arbitrary code in the context of the user running the application. Full technical details for these vulnerabilities are available via source code analysis, along with the publicly available proof-of-concept.
Status: Vendor confirmed, no updates available.
Description: Oracle has released a cumulative security patch for a wide range of its products on July 15, 2009. This Critical Patch Update contains 30 new security fixes across different products. Flaws addressed in this update include remote command execution vulnerabilities, denial of service issues, information disclosure vulnerabilities, SQL injection vulnerabilities, security restrictions bypass issues, and elevation of privilege issues. There still are some issues whose impacts are yet unknown. Authentication is not required to exploit some of these vulnerabilities while for some authentication is required.
Status: Vendor confirmed, updates available.
Description: Microsoft Office Publisher is an application for designing and publishing documents. There is a pointer dereference vulnerability in "PUBCONV.DLL module" in Microsoft Office Publisher 2007, which can be triggered by a specially crafted Publisher file. The specific flaw is caused due to an error in calculating object handler data while processing the malformed Publisher file, a file that have been created in older versions of Office Publisher. Successful exploitation might lead to system memory corruption and arbitrary code execution. Note that the affected version of Publisher does not open files without first prompting the user. An attacker will have to entice the user into opening a malformed Publisher file; either by sending the malicious file as an e-mail attachment or by sending a link, which hosts such a malformed Publisher file, in an e-mail message. Some technical information is available for this vulnerability.
Status: Vendor confirmed, updates available.
Description: Microsoft Internet Security and Acceleration (ISA) Server 2006 has a Security Bypass Vulnerability. In order to exploit this vulnerability there are some prerequisites on the configuration of the server. The web listener should be configured for forms-based authentication (FBA) with RADIUS One-Time Passwords (OTP), the web publishing rule should delegate using Kerberos Constrained Delegation (KCD), and the server should allow HTTP Basic authentication fallback. In such a scenario The ISA servers does not do adequate checks on the incoming authenticating requests that indicates fall-back to HTTP Basic authentication. Successful exploitation will lead to elevation of privilege giving an attacker access to any Web published resource. Some technical information is available for this vulnerability.
Status: Vendor confirmed, updates available.
Description: ISC DHCP is an open source implementation of Dynamic Host Configuration Protocols (DHCP) that includes a DHCP server and a DHCP client. There is a buffer overflow vulnerability in ISC DHCP client which can be triggered by a specially crafted response from a malicious DHCP server. The specific flaw is a boundary error in the "script_write_params()" function within the 'dhclient'. The issue is caused due to inadequate checks on the subnet number generated from the server-supplied leased address and subnet-mask. Successful exploitation might allow an attacker to execute arbitrary code. Full technical details of the vulnerability are available via source code analysis.
Status: Vendor confirmed, updates available.
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