Finding and Fixing Vulnerabilities in Elevation of Privilege Using Windows Service Isolation Bypass (982316), a High Risk Vulnerability

With Notes on Remediation, Penetration Testing, Disclosures, Patching and Exploits

Contents

  • Vital information on this issue
  • Scanning For and Finding Vulnerabilities in Elevation of Privilege Using Windows Service Isolation Bypass (982316)
  • Penetration Testing (Pentest) for this Vulnerability
  • Security updates on Elevation of Privilege Using Windows Service Isolation Bypass (982316))
  • Disclosures related to Elevation of Privilege Using Windows Service Isolation Bypass (982316))
  • Confirming the Presence of Elevation of Privilege Using Windows Service Isolation Bypass (982316))
  • False positive/negatives
  • Patching/Repairing this vulnerability
  • Exploits related to Elevation of Privilege Using Windows Service Isolation Bypass (982316))

Vital Information on This Issue
Elevation of Privilege Using Windows Service Isolation Bypass (982316) is a high risk vulnerability that is one of the most frequently found on networks around the world. This issue has been around since at least 1990 but has proven either difficult to detect, difficult to resolve or prone to being overlooked entirely.


Vulnerability Name: Elevation of Privilege Using Windows Service Isolation Bypass (982316)
Test ID: 12673
Risk: High
Category: Policy Checks
Type: Attack
Summary: Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2, Windows Vista SP1 and SP2, Windows Server 2008 SP2 and R2, and Windows 7 allow local users to gain privileges by leveraging access to a process with NetworkService credentials, as demonstrated by TAPI Server, SQL Server, and IIS processes, and related to the Windows Service Isolation feature. NOTE: the vendor states that privilege escalation from NetworkService to LocalSystem does not cross a security boundary.
Impact: A local attacker could exploit this by leveraging the TAPI service to execute code as SYSTEM.
Solution: See solution provided at: http://www.microsoft.com/technet/security/advisory/2264072.mspx
CVE: CVE-2010-1886
More Information:
http://www.microsoft.com/technet/security/advisory/2264072.mspx
Nist NVD (CVSS): (AV:L/AC:L/Au:S/C:C/I:C/A:C)
CVSS Scroe: 6.8
For more information on this also issue see: www.securiteam.com

Scanning For and Finding Elevation of Privilege Using Windows Service Isolation Bypass (982316)
Use of Vulnerability Management tools, like AVDS, are standard practice for the discovery of this vulnerability. The primary failure of VA in finding this vulnerability is related to setting the proper scope and frequency of network scans. It is vital that the broadest range of hosts (active IPs) possible are scanned and that scanning is done frequently. We recommend weekly. Your existing scanning solution or set of test tools should make this not just possible, but easy and affordable. If that is not the case, please consider AVDS.

Penetration Testing (pentest) for this Vulnerability
The Vulnerabilities in Elevation of Privilege Using Windows Service Isolation Bypass (982316) is prone to false positive reports by most vulnerability assessment solutions. AVDS is alone in using behavior based testing that eliminates this issue. For all other VA tools security consultants will recommend confirmation by direct observation. In any case Penetration testing procedures for discovery of Elevation of Privilege Using Windows Service Isolation Bypass (982316) produces the highest discovery accuracy rate, but the infrequency of this expensive form of testing degrades its value. The ideal would be to have pentesting accuracy and the frequency and scope possibilities of VA solutions, and this is accomplished only by AVDS.

Security Updates on Vulnerabilities in Elevation of Privilege Using Windows Service Isolation Bypass (982316)
For the most current updates on this vulnerability please check www.securiteam.com Given that this is one of the most frequently found vulnerabilities, there is ample information regarding mitigation online and very good reason to get it fixed. Hackers are also aware that this is a frequently found vulnerability and so its discovery and repair is that much more important. It is so well known and common that any network that has it present and unmitigated indicates "low hanging fruit" to attackers.

Disclosures related to this vulnerability
http://www.cvedetails.com/cve/CVE-2010-1886/

Confirming the Presence of Vulnerabilities in Elevation of Privilege Using Windows Service Isolation Bypass (982316))
AVDS is currently testing for and finding this vulnerability with zero false positives. If your current set of tools is indicating that it is present but you think it is probably a false positive, please contact us for a demonstration of AVDS.

False positive/negatives
The secret killer of VA solution value is the false positive. There was an industry wide race to find the most vulnerabilities, including Vulnerabilities in Elevation of Privilege Using Windows Service Isolation Bypass (982316) ,and this resulted in benefit to poorly written tests that beef up scan reports by adding a high percentage of uncertainty. This may have sold a lot of systems some years ago, but it also stuck almost all VA solutions with deliberately inaccurate reporting that adds time to repairs that no administrator can afford. Beyond Security did not participate in this race to mutually assured destruction of the industry and to this day produces the most accurate and actionable reports available.

Patching/Repairing this Vulnerability
https://support.microsoft.com/en-us/kb/982316 Vulnerabilities in Elevation of Privilege Using Windows Service Isolation Bypass (982316) is a high risk vulnerability that is also high frequency and high visibility. This is the most severe combination of security factors that exists and it is extremely important to find it on your network and fix it as soon as possible.

Exploits related to Vulnerabilities in Elevation of Privilege Using Windows Service Isolation Bypass (982316)
This vulnerability requires that the attacker convince the user to open a file using a vulnerable program, from a remote network location. When the application loads one of its required or optional libraries, the vulnerable application may attempt to load the library from the remote network location. If the attacker provides a specially crafted library at this location, the attacker may succeed at executing arbitrary code on the user's machine. http://www.cvedetails.com/cve/CVE-2010-1886/

Please also visit www.securiteam.com to view any exploits available for this vulnerability, or search using "Vulnerabilities in Elevation of Privilege Using Windows Service Isolation Bypass (982316) exploits".


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