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    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
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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 […]
    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 […]

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    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

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    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.
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    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 Threat Advisory – CVE-2018-11763 – Apache HTTP Server SETTINGS Frames Denial of Service Vulnerability

September 26, 2018

A vulnerability has been reported in Apache HTTP Server, which can be exploited by malicious people to cause a DoS (Denial of Service).

 

 

IMPACT:  NORMAL

 

 

PUBLISH DATE: 26-09-2018

 

 

OVERVIEW

 

 

In Apache HTTP Server 2.4.17 to 2.4.34, an attacker could induce a Denial of Service by sending continuous SETTINGS frames of maximum size on an ongoing HTTP/2 connection. It will keep the connection busy and will prevent it from timing out. This can be abused for a DoS on the server. Only servers that have enabled the h2 protocol can be affected.

 

 

ANALYSIS

 

 

A vulnerability is found in some versions of the Apache HTTP Server that may lead to a Denial of Service condition. This error affects an unknown function of the component SETTINGS Frame Handler.

 

 

When handling SETTINGS frames of maximum size an ongoing HTTP/2 connection can be exploited. The connection won’t time out, and may cause Denial of Service. It impacts the availability of an organization.

 

 

However, successful exploitation of this error requires that h2 protocol is enabled in the server. This network vulnerability does not require any privileges or user interaction to be exploited.

 

 

 

AFFECTED PRODUCTS

 

 

Apache HTTP Server 2.4.x

 

(The vulnerability is reported in versions 2.4.34, 2.4.33, 2.4.30, 2.4.29, 2.4.28, 2.4.27, 2.4.26, 2.4.25, 2.4.23, 2.4.20, and 2.4.18.)

 

(The httpd packages in Red Hat Enterprise Linux 7 and earlier do not include support for HTTP/2 and hence are not affected by this issue.)

 

 

UPDATES

Update to version 2.4.35. Refer to links for further help.

http://httpd.apache.org/download.cgi

https://websiteforstudents.com/apache2-http-server-2-4-35-released-heres-how-to-install-upgrade-on-ubuntu-16-04-18-04-lts/

 

 

MITIGATION

Apart from updating to the patched version, another possible mitigation is to not enable the h2 protocol.

 

 

If you think you are a victim of a cyberattack, immediately send an email to info@rewterz.com.

 

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