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    REWTERZ THREAT ADVISORY – CVE-2018-15454 – Cisco zero-day exploited to crash devices and cause Denial of Service

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    Rewterz Threat Advisory – ICS: Multiple Schneider Electric IGSS Vulnerabilities
    Severity High Analysis Summary CVE-2023-27984 CVSS:7.8 Schneider Electric IGSS could allow a remote attacker to execute arbitrary code on the system, caused by improper input validation […]

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    REWTERZ THREAT ADVISORY – CVE-2018-15454 – Cisco zero-day exploited to crash devices and cause Denial of Service

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    Rewterz Threat Advisory – CVE-2022-42436 – IBM MQ Vulnerability
    Severity Medium Analysis Summary CVE-2022-42436 IBM MQ Managed File Transfer could allow a local user to obtain sensitive information from diagnostic files. Impact Indicators Of Compromise […]
    March 19, 2023
    March 19, 2023
    Rewterz Threat Advisory – ICS: Rockwell Automation Modbus TCP AOI Server Vulnerability
    Severity Medium Analysis Summary CVE-2023-0027 Rockwell Automation Modbus TCP AOI Server could allow a remote attacker to obtain sensitive information. By sending a malformed message, an […]
    March 17, 2023
    March 17, 2023
    Rewterz Threat Advisory – ICS: Multiple Schneider Electric IGSS Vulnerabilities
    Severity High Analysis Summary CVE-2023-27984 CVSS:7.8 Schneider Electric IGSS could allow a remote attacker to execute arbitrary code on the system, caused by improper input validation […]

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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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    leadership

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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.
    help

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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-2018-15454 – Cisco zero-day exploited to crash devices and cause Denial of Service

November 2, 2018

This is an advisory on a recent zero-day vulnerability of Cisco, that’s
being exploited in the wild to crash devices.

 

 

IMPACT: NORMAL

 

PUBLISH DATE: 02-11-2018

 

OVERVIEW

 

A zero-day vulnerability is found in the Session Initiation Protocol (SIP) inspection engine of Cisco’s ASA and TFD
software. The vendor released an advisory about the vulnerability being exploited in the wild. No software updates are available. However, Cisco has given out some mitigation guidelines.

 

 

ANALYSIS

 

 

A zero-day vulnerability has been found in the Session Initiation Protocol (SIP) inspection engine of Cisco Adaptive
Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software. Exploiting the vulnerability, an unauthenticated, remote attacker can reload an affected device. The attacker can also cause a Denial of Service (DoS) condition by triggering high CPU.

 

Researchers found out that improper handling of SIP traffic causes the vulnerability. The vulnerability can be triggered by sending specially designed SIP requests to trigger this issue at a high rate across an affected device.
The vendor has released an advisory informing that the vulnerability has been exploited in the wild to crash and reload devices.

 

Because SIP inspection is enabled by default in all ASA and FTD software packages, a large number of Cisco devices are believed to be vulnerable.

No software updates are available that address this issue.

 

 

AFFECTED PRODUCTS

 

 

Cisco confirmed that the following products are affected if they run ASA 9.4 and later, or FTD 6.0 and later:

3000 Series Industrial Security Appliance (ISA)

ASA 5500-X Series Next-Generation Firewalls

ASA Services Module for Cisco Catalyst 6500 Series Switches and Cisco 7600 Series Routers

Adaptive Security Virtual Appliance (ASAv)

Firepower 2100 Series Security Appliance

Firepower 4100 Series Security Appliance

Firepower 9300 ASA Security Module

FTD Virtual (FTDv)

 

 

MITIGATION

 

Cisco suggests that device owners should take some precautions to avoid getting their equipment crashed. These
mitigation techniques involve the following measures.

 

• Device owners are advised to disable SIP inspection.

• Once device owners track and identify an attacker’s IP address, they should block traffic from that IP address
using the ASA and FTD traffic filtering systems.

• Cisco claims that the malicious traffic associated with these attacks until now has used the 0.0.0.0 IP address for
the “Sent-by Address” field. Using this information, firms can easily filter an attacker’s incoming traffic.

 

If you think you are a victim of a cyber-attack. Immediately send an email to soc@rewterz.com for a quick response

Platform

  • Rewterz XDR
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Managed Security Services

  • Managed Security Monitoring
  • Remote SOC
  • Onsite SOC
  • Hybrid SOC

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

Resources

  • Blog
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Connect With Us

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