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    Rewterz Threat Alert – Chaos Ransomware – Active IOCs
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    Rewterz Threat Advisory – Multiple Adobe ColdFusion Vulnerabilities
    Severity High Analysis Summary CVE-2023-26361 CVSS:4.9 Adobe ColdFusion could allow a remote authenticated attacker to traverse directories on the system. An attacker could send a specially […]
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    March 17, 2023
    Rewterz Threat Alert – Ursnif Banking Trojan aka Gozi – Active IOCs
    Severity Medium Analysis Summary Ursnif banking trojan also known as Gozi and Dreambot has been around for more than 10 years. It gained popularity in 2015 […]

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    Rewterz Threat Advisory – Oracle VM Server for x86 update for kernel-uek

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    • Remote SOC
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    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.

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    • Penetration Testing
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    March 17, 2023
    March 17, 2023
    Rewterz Threat Alert – Chaos Ransomware – Active IOCs
    Severity High Analysis Summary Chaos is a customizable ransomware builder that emerged on June 9 2021 (in underground forums) by falsely marketing itself as the .NET […]
    March 17, 2023
    March 17, 2023
    Rewterz Threat Advisory – Multiple Adobe ColdFusion Vulnerabilities
    Severity High Analysis Summary CVE-2023-26361 CVSS:4.9 Adobe ColdFusion could allow a remote authenticated attacker to traverse directories on the system. An attacker could send a specially […]
    March 17, 2023
    March 17, 2023
    Rewterz Threat Alert – Ursnif Banking Trojan aka Gozi – Active IOCs
    Severity Medium Analysis Summary Ursnif banking trojan also known as Gozi and Dreambot has been around for more than 10 years. It gained popularity in 2015 […]

    Threat Insights

    16
    pdf-file (1)
    Annual Threat Intelligence Report 2022
    • Threat Advisories
    • Monthly Threat Insights
    • Threat Intelligence Reports
  • Why Rewterz?

    About Us

    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.

    Read More

    play_btn_Smallplay_btn_hover_Small
    leadership

    Our Leadership

    Our leadership team brings together years of knowledge and experience in cybersecurity to drive our company's mission and vision. Our team is passionate about delivering high-quality products and services, leading by example and assisting our clients in securing their organization’s environment.
    help

    CSR

    At Rewterz, we believe that businesses have a responsibility to impact positively and contribute to the well-being of our communities as well as the planet. That's why we are committed to operating in a socially responsible and sustainable way.

    Connect with Us

    • Contact
    • Careers
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September 17, 2018
British Airways faces Data Breach of 380,000 Accounts
September 18, 2018

Rewterz Threat Advisory – Oracle VM Server for x86 update for kernel-uek

September 17, 2018

CVE-2018-5390

 

Oracle has issued an update for kernel-uek included in Oracle VM Server for x86 to patch a vulnerability that could cause a DoS.

 

IMPACT:  NORMAL

 

 

PUBLISH DATE:  17-09-2018

 

 

OVERVIEW

 

 

Linux kernel versions 4.9+ can be forced to make very expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() for every incoming packet which can lead to a denial of service. Oracle has released updates for the vulnerability.

 

 

ANALYSIS

 

 

Linux kernel’s handling of specially crafted TCP packets was found to be flawed with an error called SegmentSmack. The flaw can be exploited by a remote attacker by injecting specially modified packets in the out_of_order_queue to induce expensive calls to tcp_collapse_ofo_queue() and tcp_prune_ofo_queue() functions, within ongoing TCP sessions. This could lead to a CPU saturation and hence a denial of service on the system.

 

Maintaining the denial of service condition requires continuous two-way TCP sessions to a reachable open port, thus the attacks cannot be performed using spoofed IP addresses.

 

This patch series makes sure we cut cpu cycles enough to render the attack not critical.

 

AFFECTED PRODUCTS

 

 

Oracle VM Server 3.x 

 

 

UPDATES

Apply updated packages concerning Oracle VM Server for x86 version 3.4.

Follow vendor’s advisory for further help.

https://linux.oracle.com/errata/OVMSA-2018-0256.html

 

 

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Assess

  • Compromise Assessment
  • APT Assessment
  • Penetration Testing
  • Architecture Design & Review
  • Red Team Assessment
  • Purple Team Assessment
  • Social Engineering
  • Source Code Review

Transform

  • SOC Consultancy
  • SOC Maturity Assessment
  • SOC Model Evaluation
  • SOC Gap Analysis
  • SIEM Gap Analysis
  • SIEM Optimization
  • SOC Content Pack

Train

  • Simulated Cyber Attack Exercise
  • Tabletop Exercise
  • Security Awareness and Training

Respond

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