Qualys Blog

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110 posts

Petya Ransomware: What You Need to Know

On Tuesday, a variant of the ransomware “Petya” began propagating in several countries across Europe. This new variant leverages the EternalBlue exploit used in WannaCry, and also takes advantage of misconfigured permissions to spread throughout the network.

EternalBlue is a leaked exploit developed by the NSA that leverages the vulnerability patched in MS17-010. All unpatched versions of Windows are vulnerable to EternalBlue, excluding recent versions of Windows 10. Microsoft has also chosen to release patches for some end-of-support versions of Windows.

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The Stack Clash

What is the Stack Clash?

The Stack Clash is a vulnerability in the memory management of several operating systems. It affects Linux, OpenBSD, NetBSD, FreeBSD and Solaris, on i386 and amd64.  It can be exploited by attackers to corrupt memory and execute arbitrary code.

Qualys researchers discovered this vulnerability and developed seven exploits and seven proofs of concept for this weakness, then worked closely with vendors to develop patches. As a result we are releasing this advisory today as a coordinated effort, and patches for all distributions are available June 19, 2017. We strongly recommend that users place a high priority on patching these vulnerabilities immediately.

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Lessons Learned from SQL Injection Fix in Joomla 3.7.0

The Joomla community recently patched a SQL injection vulnerability introduced in Joomla 3.7.0. The article reporting this vulnerability explains how to identify the vulnerability (which was discovered via static code analysis) and how to craft an attack, e.g.

http://example.com/joomla/index.php?option=com_fields&view=fields&layout=modal&
list[fullordering]=exploitation_code

After reviewing the description of the vulnerability, I wondered whether an automated web application scanner, known as a DAST (Dynamic Application Security Testing) tool, could identify an instance of this vulnerability without digging into the source code.

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Samba Vulnerability CVE-2017-7494

On Wednesday, the Samba Team patched a vulnerability that exists in all versions of Samba including and after version 3.5.0. Exploitation of this vulnerability could result in remote code execution on the affected host.

Samba is used to provide SMB and CIFS services for Linux systems, and is pervasive in both enterprise and consumer products. While the Samba Team is providing patches for the latest versions (4.4.x and higher), some Linux vendors, such as RedHat and Ubuntu, are providing patches for older versions of Samba if they are used in a supported version of the OS. The Samba Team may also release patches for older versions of Samba.

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Visualizing WannaCry & Shadow Brokers with Dashboards

To assess infections from WannaCry ransomware and threat exposure from the Shadow Brokers vulnerabilities across an entire IT environment, it’s helpful to visualize your exposure via dynamic dashboards.

Using Qualys AssetView and ThreatPROTECT, I created a single-pane incident response dashboard containing six key data points that provide a complete picture to assess both infection of WannaCry and threat exposure from the Shadow Brokers vulnerabilities. With the data from this dashboard, you can take immediate action against WannaCry. Each dashboard element automatically collects trend data that allows customers to track their remediation efforts over time.

See Visualizing WannaCry and Shadow Brokers: How to Configure Dashboards in AssetView for the details of the dashboard, including how to create dashboards in Qualys AssetView and specifically how I built the dashboard for WannaCry and Shadow Brokers.

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How to Rapidly Identify Assets at Risk to WannaCry Ransomware and ETERNALBLUE Exploit

In what may be the first public weaponizing of April’s Shadow Brokers dump of NSA exploits, a ransomware attack has crippled IT systems globally and disrupted operations at major organizations, including patient services at UK hospitals.

About 80,000 infections have been detected in about 100 countries at the time of this writing, and the attack, which uses the WannaCry (WanaCrypt0r 2.0) ransomware, continues to spread.

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Intel AMT Vulnerability

Last week, Intel published a security advisory (INTEL-SA-00075) regarding a new vulnerability in Intel Active Management Technology (AMT), Intel Standard Manageability (ISM), and Intel Small Business Technology (SBT). The firmware versions impacted are 6.x, 7.x, 8.x 9.x, 10.x, 11.0, 11.5, and 11.6. In addition to the vulnerability disclosure, details of how to exploit it remotely has been released publicly.

Exploitation of this vulnerability could allow an attacker to gain complete control of an affected system. Updated firmwares will be released by the system OEM, but Intel has provided mitigation steps to prevent remote exploitation of the vulnerability. The Qualys Cloud Platform can help you detect any vulnerable systems, allowing you to quickly target them for mitigation.

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The Shadow Brokers Release Zero Day Exploit Tools

On Friday, a hacker group known as The Shadow Brokers publicly released a large number of functional exploit tools. Several of these tools make use of zero-day vulnerabilities, most of which are in Microsoft Windows. Exploiting these vulnerabilities in many cases leads to remote code execution and full system access.

Both end-of-support and current Windows versions are impacted, including Windows 2003, XP, Vista, 7, 2008, 8, and 2012. Microsoft has released patches for each vulnerability across all supported platforms, but will not be releasing patches for end-of-support versions of Windows. It is highly recommended that any end-of-support Windows systems be replaced or isolated, as these systems will often be impacted by new vulnerabilities, without the availability of a patch.

For zero-day vulnerabilities in Operating Systems, you can use your existing asset inventory information from Qualys AssetView, and search for any OS to determine how many vulnerable assets are deployed. This can be done without additional scanning if the data is relatively fresh.

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Microsoft IIS 6.0 Buffer Overflow Zero Day

A new zero-day vulnerability (CVE-2017-7269) impacting Microsoft IIS 6.0 has been announced with proof-of-concept code. This vulnerability can only be exploited if WebDAV is enabled. IIS 6.0 is a component of Microsoft Windows Server 2003 (including R2.) Microsoft has ended support for Server 2003 on July 14, 2015, which means that this vulnerability will most likely not be patched. It is recommended that these systems be upgraded to a supported platform. The current workaround is to disable the WebDAV Web Service Extension if it is not needed by any web applications.

The Qualys Cloud Platform can help you detect the vulnerability, track and manage Server 2003 Assets, as well as block exploits against web-based vulnerabilities like this one.

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Path Fuzzing Challenges

Web application scanners often struggle to scan applications that incorporate parameters into their URL paths, specifically web apps that use URL-rewrite techniques or web apps with REST APIs that take URL parameters. One key approach is to fuzz the application’s URL parameter inputs in order to identify possible injection points for malicious code. But without knowledge of the URL structure, it’s difficult for scanners to fuzz those parameters efficiently and with full coverage, which is required for an effective scan.

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