Dark Reading is part of the Informa Tech Division of Informa PLC

This site is operated by a business or businesses owned by Informa PLC and all copyright resides with them.Informa PLC's registered office is 5 Howick Place, London SW1P 1WG. Registered in England and Wales. Number 8860726.

Vulnerabilities / Threats

5/19/2009
01:36 PM
Connect Directly
Google+
LinkedIn
Twitter
RSS
E-Mail
50%
50%

Microsoft Issues IIS Security Advisory

An exploit of the vulnerability could give an attacker access to a directory that normally requires authentication.

Microsoft on Monday issued a security advisory about an authentication bypass vulnerability in certain Microsoft Internet Information Services configurations.

The company said it's investigating reports of a vulnerability that could allow privilege elevation but that it isn't aware of any attacks that have attempted to exploit this vulnerability.

Microsoft's most current IIS software, IIS 7.0 in Windows Server 2008, is not affected.

The problem has to do with the way the WebDAV extension for IIS processes HTTP requests. Using a maliciously crafted HTTP request, the attacker could gain access to a directory that normally requires authentication.

Jonathan Ness, an engineer with the Microsoft Security Response Center, characterizes the risk as primarily one of information disclosure.

"[T]he most likely attack would be a malicious anonymous user requesting contents of a Web server subdirectory that uses IIS permission restricting access to only authenticated users," he explains in a blog post. "The root of the Web server would typically grant read access to the anonymous user account so this vulnerability would allow the protected subdirectories to be accessed using the permissions of the Web server root (allowing anonymous access)."

A number of factors mitigate the severity of the vulnerability:

  • The file system's access control list remains in place, so an attacker who managed to access a system using the vulnerability would still be limited by ACL permissions for an anonymous user account.
  • Anonymous user accounts are limited to read-only access by default. So unless an administrator has overridden this setting, an attacker would not have the ability to write files.
  • WebDAV is not enabled by default on Windows Server 2003 systems running IIS 6.0.

IIS users most at risk are those running IIS 5, 5.1, or 6.0 with WebDAV enabled, using IIS permissions to restrict access to a subdirectory that's inside a directory allowing anonymous access, and who have granted file system access to the anonymous user account.


InformationWeek Analytics has published an independent analysis on what executives really think about security. Download the report here (registration required).

Comment  | 
Print  | 
More Insights
Comments
Oldest First  |  Newest First  |  Threaded View
Where Businesses Waste Endpoint Security Budgets
Kelly Sheridan, Staff Editor, Dark Reading,  7/15/2019
US Mayors Commit to Just Saying No to Ransomware
Robert Lemos, Contributing Writer,  7/16/2019
Register for Dark Reading Newsletters
White Papers
Video
Cartoon Contest
Current Issue
Building and Managing an IT Security Operations Program
As cyber threats grow, many organizations are building security operations centers (SOCs) to improve their defenses. In this Tech Digest you will learn tips on how to get the most out of a SOC in your organization - and what to do if you can't afford to build one.
Flash Poll
The State of IT Operations and Cybersecurity Operations
The State of IT Operations and Cybersecurity Operations
Your enterprise's cyber risk may depend upon the relationship between the IT team and the security team. Heres some insight on what's working and what isn't in the data center.
Twitter Feed
Dark Reading - Bug Report
Bug Report
Enterprise Vulnerabilities
From DHS/US-CERT's National Vulnerability Database
CVE-2002-0390
PUBLISHED: 2019-07-21
** REJECT ** DO NOT USE THIS CANDIDATE NUMBER. ConsultIDs: CVE-2002-0639. Reason: This candidate is a reservation duplicate of CVE-2002-0639. Notes: All CVE users should reference CVE-2002-0639 instead of this candidate. All references and descriptions in this candidate have been removed to prevent ...
CVE-2018-17210
PUBLISHED: 2019-07-20
An issue was discovered in PrinterOn Central Print Services (CPS) through 4.1.4. The core components that create and launch a print job do not perform complete verification of the session cookie that is supplied to them. As a result, an attacker with guest/pseudo-guest level permissions can bypass t...
CVE-2019-12934
PUBLISHED: 2019-07-20
An issue was discovered in the wp-code-highlightjs plugin through 0.6.2 for WordPress. wp-admin/options-general.php?page=wp-code-highlight-js allows CSRF, as demonstrated by an XSS payload in the hljs_additional_css parameter.
CVE-2019-9229
PUBLISHED: 2019-07-20
An issue was discovered on AudioCodes Mediant 500L-MSBR, 500-MBSR, M800B-MSBR and 800C-MSBR devices with firmware versions F7.20A to F7.20A.251. An internal interface exposed to the link-local address 169.254.254.253 allows attackers in the local network to access multiple quagga VTYs. Attackers can...
CVE-2019-12815
PUBLISHED: 2019-07-19
An arbitrary file copy vulnerability in mod_copy in ProFTPD up to 1.3.5b allows for remote code execution and information disclosure without authentication, a related issue to CVE-2015-3306.