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    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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    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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    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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Rewterz Threat Advisory – CVE-2018-16986 & CVE-2018-7080 – New Bluetooth Vulnerabilities Exposed in Aruba, Cisco, Meraki Access Points
November 7, 2018
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Rewterz Threat Advisory – CVE-2018-15443 – Cisco Firepower Detection Engine TCP Intrusion Prevention System Rule Bypass Vulnerability
November 9, 2018

Rewterz Threat Advisory – Virtual Box zero-day vulnerability exposed

November 8, 2018

An attacker could escape the virtual environment of the guest machine and reach the Ring 3 privilege layer, used for running code from most user programs.

 

 

IMPACT:  CRITICAL

 

 

PUBLISH DATE:  08-11-2018

 

 

OVERVIEW

 

 

The issue is present in a shared code base of the virtualization software, available on all supported operating systems. Exploiting this issue, an attacker can reach the ring 3 privilege layer in virtual box by escaping the virtual environment of the guest machine.

 

 

ANALYSIS

 

 

Sergey Zelenyuk, the researcher who found and exposed this vulnerability on the internet with a step-by-step guide to exploit it, found that the security bug can be leveraged on virtual machines configured with the Intel PRO/1000 MT Desktop (82540EM) network adapter in Network Address Translation (NAT) mode, the default setup that allows the guest system to access external networks.

 

 

 

 

The researcher revealed this vulnerability in a recent write-up:

“The [Intel PRO/1000 MT Desktop (82540EM)] has a vulnerability allowing an attacker with root/administrator privileges in a guest to escape to a host ring3. Then the attacker can use existing techniques to escalate privileges to ring 0 via /dev/vboxdrv,”.

 

The researcher has also explained how to trigger the necessary conditions to obtain a buffer overflow to be exploited for escaping confinements of the virtual operating system.

 

First, an integer underflow condition is caused using packet descriptors – data segments that allow the network adapter to track network packet data in the system memory. This could be leveraged to read data from the guest OS and cause an overflow condition that could lead to overwriting function pointers; or to cause a stack overflow condition.

 

Later, E1000 will be initialized by the Linux kernel module (LKM) to leak the information where LKM disables E1000 loopback mode to make stack buffer overflow code unreachable.

 

“Here the LKM uses the integer underflow vulnerability to make the heap buffer overflow. The heap buffer overflow allows for use E1000 EEPROM to write two any bytes relative to a heap buffer in 128 KB range. Hence the attacker gains a write primitive.”

Researcher summarized the process in following words:

 

 

 

AFFECTED PRODUCTS

 

 

VirtualBox 5.2.20 and prior versions are said to be affected.

5.2.20 is the latest version, released on October 16 – and it can be exploited on any host or guest operating system as the underlying bugs affect shared code.

(Ubuntu 16.04 and 18.04 x86-64 guests were used to test this vulnerability, but the researcher believes it also works against windows).

 

 

MITIGATION

 

 

There are no patches available as yet for fixing this vulnerability.

 

If you think you’re the victim of a cyber-attack, immediately send an email to soc@rewterz.com for a quick response.

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