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    Rewterz Threat Alert – GandCrab or .CRAB Ransomware – Active IOCs
    Severity Medium Analysis Summary GandCrab – a ransomware-as-a-service variant – was discovered in early 2018. At least five versions of GandCrab have been created since its […]
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    Rewterz Threat Advisory – CVE-2023-20113 – Cisco SD-WAN vManage Software Vulnerability
    Severity Medium Analysis Summary CVE-2023-20113  Cisco SD-WAN vManage Software is vulnerable to cross-site request forgery, caused by improper validation of user-supplied input. By persuading an authenticated […]

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    Rewterz Threat Advisory – CVE-2018-18559 – Linux Kernel “packet_do_bind()” Privilege Escalation Vulnerability

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    Rewterz Threat Alert – GandCrab or .CRAB Ransomware – Active IOCs
    Severity Medium Analysis Summary GandCrab – a ransomware-as-a-service variant – was discovered in early 2018. At least five versions of GandCrab have been created since its […]
    March 25, 2023
    March 25, 2023
    Rewterz Threat Alert – NJRAT – Active IOCs
    Severity Medium Analysis Summary NjRat is a Remote Access Trojan, which is found leveraging Pastebin to deliver a second-stage payload after initial infection. There are multiple […]
    March 24, 2023
    March 24, 2023
    Rewterz Threat Advisory – CVE-2023-20113 – Cisco SD-WAN vManage Software Vulnerability
    Severity Medium Analysis Summary CVE-2023-20113  Cisco SD-WAN vManage Software is vulnerable to cross-site request forgery, caused by improper validation of user-supplied input. By persuading an authenticated […]

    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.

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Rewterz
Rewterz Threat Advisory – Microsoft Windows Server 2008 and Windows 7 multiple vulnerabilities
November 15, 2018
Rewterz
Rewterz Threat Advisory – Microsoft Windows 8.1 Multiple Vulnerabilities
November 19, 2018

Rewterz Threat Advisory – CVE-2018-18559 – Linux Kernel “packet_do_bind()” Privilege Escalation Vulnerability

November 16, 2018

Malicious local users may gain escalated privileges to execute arbitrary code by exploiting a vulnerability in the Linux Kernel.

 

 

IMPACT:  NORMAL

 

 

PUBLISH DATE:  16-11-2018

 

 

OVERVIEW

 

 

A security flaw in the Linux Kernel may be exploited by malicious local users to gain kernel privileges. It could then be used to induce a use-after-free condition on the system, or execute arbitrary code using Kernel privileges. Updates are available for all the affected versions of the product.

 

 

ANALYSIS

 

 

A race condition error within the “packet_do_bind()” function (net/packet/af_packet.c) can be exploited to trigger a use-after-free error. Successful exploitation may allow execution of arbitrary code with kernel privileges.

 

 

In the Linux kernel through 4.19, a use-after-free can occur due to a race condition between fanout_add from setsockopt and bind on an AF_PACKET socket. This issue exists because of the 15fe076edea787807a7cdc168df832544b58eba6 incomplete fix for a race condition.

 

 

The code mishandles a certain multithreaded case involving a packet_do_bind unregister action followed by a packet_notifier register action. Later, packet_release operates on only one of the two applicable linked lists. The attacker can achieve Program Counter control.

 

An unprivileged, local user could use this flaw to trigger kernel memory corruption, making the system crash or go unresponsive. Due to the nature of the flaw, privilege escalation cannot be fully ruled out.

 

 

AFFECTED PRODUCTS

 

 

Linux Kernel 3.16.x

Linux Kernel 4.4.x

Linux Kernel 4.9.x

Linux Kernel 4.14.x

 

 

UPDATES

 

 

Update the following affected versions according to the suggested updates available.

 

Versions 4.14.x:

Update to version 4.14.7 or later.

 

Versions 4.9.x:

Update to version 4.9.70 or later.

 

Versions 4.4.x:

Update to version 4.4.106 or later.

 

Versions 3.16.x:

Update to version 3.16.55 or later.

 

 

 

If you think you are a victim of a cyber-attack, immediately send an e-mail to soc@rewterz.com.

Platform

  • Rewterz XDR
  • Rewterz Defense
  • Rewterz Threat Intelligence

Managed Security Services

  • Managed Security Monitoring
  • Remote SOC
  • Onsite SOC
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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

  • Incident Analysis
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Threat Insights

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  • Monthly Threat Insights
  • Threat Intelligence Reports

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Connect With Us

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