Finding and Fixing Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617) , 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 Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)
  • Penetration Testing (Pentest) for this Vulnerability
  • Security updates on Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)
  • Disclosures related to Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)
  • Confirming the Presence of Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)
  • False positive/negatives
  • Patching/Repairing this vulnerability
  • Exploits related to Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)

Vital Information on This Issue
Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617) 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: Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)
Test ID: 18657
Risk: High
Category: Policy Checks
Type: Attack
Summary: The remote Windows host is missing Microsoft KB3097617, an update that restricts the use of certificates with SHA1 hashes. This restriction is limited to certificates issued under roots in the Microsoft root certificate program. The update increases the difficulty of some spoofing, phishing, and man-in-the-middle attacks.
$OUTPUT
Impact: The update increases the difficulty of some spoofing, phishing, and man-in-the-middle attacks.
Solution: See solution provided at: http://support.microsoft.com/kb/3097617
CVE:

More Information: http://social.technet.microsoft.com/wiki/contents/articles/32288.windows-enforcement-of-authenticode-code-signing-and-timestamping.aspx

https://technet.microsoft.com/library/security/3123479

https://msdn.microsoft.com/en-us/library/ms537628(v=vs.85).aspx

https://support.microsoft.com/en-us/kb/3097617

Nist NVD (CVSS):
CVSS Score:
For more information on this also issue see: www.securiteam.com

Scanning For and Finding Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)
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 Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617) 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 Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617) 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 Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)
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
https://technet.microsoft.com/en-us/library/security/2880823.aspx

Confirming the Presence of Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)
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 Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617) ,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/2862966

Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617) 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 Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)
https://support.microsoft.com/en-us/kb/3123479
https://support.microsoft.com/en-us/kb/2862973

Please also visit www.securiteam.com to view any exploits available for this vulnerability, or search using "Vulnerabilities in Deprecation of SHA-1 Hashing Algorithm for Microsoft Root Certificate Program (KB3097617)".


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