Platform
Managed Security Services
Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
March 22, 2023Severity Medium Analysis Summary Mekotio is a banking trojan that targets users in Latin America and Europe. It is primarily distributed via phishing emails and infected […]March 22, 2023Analysis Summary Overview – 23rd Mar – A Big Day – As we approach the 23rd of March, Pakistan Day, organizations and individuals should be aware […]March 22, 2023Severity High Analysis Summary CVE-2023-28684 CVSS:7.1 Jenkins remote-jobs-view-plugin Plugin could allow a remote authenticated attacker to obtain sensitive information, caused by improper handling of XML external […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
Connect with Us
Platform
Managed Security Services
Managed Penetration Testing
Rewterz penetration testing services help organizations determine if a cyber attacker can gain access to their critical assets while giving them detailed insights of the overall business impact of a cyber attack.
Resources
March 22, 2023Severity Medium Analysis Summary Mekotio is a banking trojan that targets users in Latin America and Europe. It is primarily distributed via phishing emails and infected […]March 22, 2023Analysis Summary Overview – 23rd Mar – A Big Day – As we approach the 23rd of March, Pakistan Day, organizations and individuals should be aware […]March 22, 2023Severity High Analysis Summary CVE-2023-28684 CVSS:7.1 Jenkins remote-jobs-view-plugin Plugin could allow a remote authenticated attacker to obtain sensitive information, caused by improper handling of XML external […]Threat Insights
Before Rewterz got its start, the market was in dire need of a specialized and dedicated information security company. It was nearly impossible for businesses to find a trustworthy provider that could truly cover all of their bases. We wanted to meet this need, giving companies across the globe a chance to get ahead while knowing that their data is in good hands.
Connect with Us
Rewterz Threat Advisory – CVE-2018-8374 Microsoft Exchange Server Tampering Vulnerability
August 15, 2018
Running away from the pitfall of insecure browsing
August 16, 2018
Multiple vulnerabilities are found in VMware Workstation Player which may result in disclosure of sensitive information and bypassing of certain security restrictions.
IMPACT: CRITICAL
PUBLISH DATE: 15-08-2018
OVERVIEW
Some vulnerabilities in VMware Workstation player and Fusion may lead to unauthorized disclosure of potentially sensitive information stored in the L1 data cache to an attacker, using a local user access. Moreover, the vulnerabilities may cause a bypassing of some of the security restrictions and lead to code execution on the host by a guest.
BACKGROUND INFORMATION
The CVE-2018-6973 is attributed to an out-of-bounds write vulnerability in the e1000 device, in VMware Workstation (14.x before 14.1.3) and Fusion (10.x before 10.1.3). This vulnerability may authorize a guest to execute code on the host.
CVE-2018-3646 is for systems with microprocessors utilizing speculative execution. This vulnerability may cause unauthorized disclosure of information residing in the L1 data cache to an attacker with local user access, authorizing him with guest OS privilege via a terminal page fault and a side-channel analysis.
ANALYSIS
An error within the e1000 network adapter can be exploited by an attacker to cause an out-of-bounds write memory access and subsequently execute arbitrary code with host privileges. The CVE-2018-6973 vulnerability is reported in VMware Workstation and Fusion.
Column 5 of the following table lists the action required to remediate the vulnerability in each release, if a solution is available.
The CVE-2018-3646 vulnerability may allow a malicious VM running on a given CPU core to effectively read the hypervisor’s or another VM’s privileged information that resides sequentially or concurrently in the same core’s L1 Data cache.
CVE-2018-3646 has two currently known attack vectors; “Sequential-Context” and “Concurrent-Context.
Sequential-context attack vector: a malicious VM can potentially infer recently accessed L1 data of a previous context (hypervisor thread or other VM thread) on either logical processor of a processor core.
Concurrent-context attack vector: a malicious VM can potentially infer recently accessed L1 data of a concurrently executing context (hypervisor thread or other VM thread) on the other logical processor of the Hyper-Threading enabled processor core.
MITIGATION
The Sequential-context attack vector is mitigated by a vSphere update to the affected product versions. This mitigation is dependent on Intel microcode updates (provided in separate ESXi patches for most Intel hardware platforms), and is enabled by default and does not impose a significant performance impact.
The Concurrent-context attack vector is mitigated through enablement of a new feature known as the “ESXi Side-Channel-Aware Scheduler”. This feature may impose a significant performance impact and is therefore not enabled by default.
The following updates include Hypervisor-Specific Mitigations for L1 Terminal Fault – VMM.
UPDATES
For CVE-2018-3646, following products need to be updated to patched versions as listed in the table.
The update details for products affected by CVE-2018-6973 are listed below:
It is best to update the running versions of the affected products as per the advisory. Furthermore, if you think you are a victim of a cyber-security attack. Immediately send an email to info@rewterz.com for a rapid response.