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CVE-2021-4034 Report - Details, Severity, Advisories and More

CVE-2021-4034 Report - Details, Severity, Advisories and More

Twingate Team

Dec 10, 2023

CVE-2021-4034 is a high-severity vulnerability that affects various software configurations and systems, including those running polkit's pkexec utility. This local privilege escalation vulnerability allows unprivileged users to execute arbitrary code and gain administrative rights on the target machine. It occurs due to incorrect handling of calling parameters count, leading to the execution of environment variables as commands. The vulnerability impacts a wide range of systems, including major Linux distributions and enterprise solutions. Understanding and addressing this issue is crucial for maintaining secure and reliable systems.

How do I know if I'm affected by CVE-2021-4034?

If you're concerned about this vulnerability, it's a local privilege escalation issue found in polkit's pkexec utility. This flaw can allow an attacker to execute arbitrary code and gain administrative rights on the target machine. The vulnerability affects various software configurations, including different versions of polkit, Red Hat Enterprise Linux, Ubuntu Linux, SUSE Linux, Oracle products, Siemens products, and StarWind Software products. To determine if you're affected, check your system for these software configurations and their respective versions. For more details, visit the National Vulnerability Database page.

What should I do if I'm affected by CVE-2021-4034?

If you're affected by the this vulnerability, it's crucial to update your system as soon as possible. Follow these steps to protect your system:

  1. Update the polkit package once it's available.

  2. If you can't update immediately, follow the mitigation steps provided by Red Hat, which involve installing systemtap packages, polkit debug info, creating a systemtap script, and loading the systemtap module into the running kernel.

  3. After updating the polkit package, remove the systemtap generated kernel module.

Remember to always keep your system updated and follow security best practices to minimize risks.

Where can I go to learn more?

The "References to Advisories, Solutions, and Tools" section of the National Vulnerability Database page provides a list of resources related to the CVE-2021-4034 vulnerability. This vulnerability is a local privilege escalation issue in polkit's pkexec program, affecting major Linux distributions. For further information and resources, check out the following links:

Is CVE-2021-4034 in CISA’s Known Exploited Vulnerabilities Catalog?

This vulnerability, also known as the Red Hat Polkit Out-of-Bounds Read and Write Vulnerability, is listed in CISA's Known Exploited Vulnerabilities Catalog. It was added on June 27, 2022, and the due date for required action is July 18, 2022. The required action is to apply updates per vendor instructions. In simple terms, this vulnerability allows a local user to gain higher privileges on a system by exploiting a flaw in the pkexec program of the polkit package. By manipulating variables, an attacker can execute commands as a privileged user without authentication.

Weakness enumeration

The weakness enumeration summary includes two CWE IDs associated with the vulnerability: CWE-787 (Out-of-bounds Write) and CWE-125 (Out-of-bounds Read). The vulnerability is a local privilege escalation in pkexec due to incorrect handling of the argument vector, affecting the polkit package.

For more details

The CVE-2021-4034 vulnerability is a significant security issue that affects the polkit's pkexec utility, allowing local privilege escalation. Various resources provide in-depth information, mitigation steps, and updates for affected products. For a comprehensive understanding of this vulnerability and its implications, we recommend visiting the National Vulnerability Database page.

Rapidly implement a modern Zero Trust network that is more secure and maintainable than VPNs.

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CVE-2021-4034 Report - Details, Severity, Advisories and More

CVE-2021-4034 Report - Details, Severity, Advisories and More

Twingate Team

Dec 10, 2023

CVE-2021-4034 is a high-severity vulnerability that affects various software configurations and systems, including those running polkit's pkexec utility. This local privilege escalation vulnerability allows unprivileged users to execute arbitrary code and gain administrative rights on the target machine. It occurs due to incorrect handling of calling parameters count, leading to the execution of environment variables as commands. The vulnerability impacts a wide range of systems, including major Linux distributions and enterprise solutions. Understanding and addressing this issue is crucial for maintaining secure and reliable systems.

How do I know if I'm affected by CVE-2021-4034?

If you're concerned about this vulnerability, it's a local privilege escalation issue found in polkit's pkexec utility. This flaw can allow an attacker to execute arbitrary code and gain administrative rights on the target machine. The vulnerability affects various software configurations, including different versions of polkit, Red Hat Enterprise Linux, Ubuntu Linux, SUSE Linux, Oracle products, Siemens products, and StarWind Software products. To determine if you're affected, check your system for these software configurations and their respective versions. For more details, visit the National Vulnerability Database page.

What should I do if I'm affected by CVE-2021-4034?

If you're affected by the this vulnerability, it's crucial to update your system as soon as possible. Follow these steps to protect your system:

  1. Update the polkit package once it's available.

  2. If you can't update immediately, follow the mitigation steps provided by Red Hat, which involve installing systemtap packages, polkit debug info, creating a systemtap script, and loading the systemtap module into the running kernel.

  3. After updating the polkit package, remove the systemtap generated kernel module.

Remember to always keep your system updated and follow security best practices to minimize risks.

Where can I go to learn more?

The "References to Advisories, Solutions, and Tools" section of the National Vulnerability Database page provides a list of resources related to the CVE-2021-4034 vulnerability. This vulnerability is a local privilege escalation issue in polkit's pkexec program, affecting major Linux distributions. For further information and resources, check out the following links:

Is CVE-2021-4034 in CISA’s Known Exploited Vulnerabilities Catalog?

This vulnerability, also known as the Red Hat Polkit Out-of-Bounds Read and Write Vulnerability, is listed in CISA's Known Exploited Vulnerabilities Catalog. It was added on June 27, 2022, and the due date for required action is July 18, 2022. The required action is to apply updates per vendor instructions. In simple terms, this vulnerability allows a local user to gain higher privileges on a system by exploiting a flaw in the pkexec program of the polkit package. By manipulating variables, an attacker can execute commands as a privileged user without authentication.

Weakness enumeration

The weakness enumeration summary includes two CWE IDs associated with the vulnerability: CWE-787 (Out-of-bounds Write) and CWE-125 (Out-of-bounds Read). The vulnerability is a local privilege escalation in pkexec due to incorrect handling of the argument vector, affecting the polkit package.

For more details

The CVE-2021-4034 vulnerability is a significant security issue that affects the polkit's pkexec utility, allowing local privilege escalation. Various resources provide in-depth information, mitigation steps, and updates for affected products. For a comprehensive understanding of this vulnerability and its implications, we recommend visiting the National Vulnerability Database page.

Rapidly implement a modern Zero Trust network that is more secure and maintainable than VPNs.

CVE-2021-4034 Report - Details, Severity, Advisories and More

Twingate Team

Dec 10, 2023

CVE-2021-4034 is a high-severity vulnerability that affects various software configurations and systems, including those running polkit's pkexec utility. This local privilege escalation vulnerability allows unprivileged users to execute arbitrary code and gain administrative rights on the target machine. It occurs due to incorrect handling of calling parameters count, leading to the execution of environment variables as commands. The vulnerability impacts a wide range of systems, including major Linux distributions and enterprise solutions. Understanding and addressing this issue is crucial for maintaining secure and reliable systems.

How do I know if I'm affected by CVE-2021-4034?

If you're concerned about this vulnerability, it's a local privilege escalation issue found in polkit's pkexec utility. This flaw can allow an attacker to execute arbitrary code and gain administrative rights on the target machine. The vulnerability affects various software configurations, including different versions of polkit, Red Hat Enterprise Linux, Ubuntu Linux, SUSE Linux, Oracle products, Siemens products, and StarWind Software products. To determine if you're affected, check your system for these software configurations and their respective versions. For more details, visit the National Vulnerability Database page.

What should I do if I'm affected by CVE-2021-4034?

If you're affected by the this vulnerability, it's crucial to update your system as soon as possible. Follow these steps to protect your system:

  1. Update the polkit package once it's available.

  2. If you can't update immediately, follow the mitigation steps provided by Red Hat, which involve installing systemtap packages, polkit debug info, creating a systemtap script, and loading the systemtap module into the running kernel.

  3. After updating the polkit package, remove the systemtap generated kernel module.

Remember to always keep your system updated and follow security best practices to minimize risks.

Where can I go to learn more?

The "References to Advisories, Solutions, and Tools" section of the National Vulnerability Database page provides a list of resources related to the CVE-2021-4034 vulnerability. This vulnerability is a local privilege escalation issue in polkit's pkexec program, affecting major Linux distributions. For further information and resources, check out the following links:

Is CVE-2021-4034 in CISA’s Known Exploited Vulnerabilities Catalog?

This vulnerability, also known as the Red Hat Polkit Out-of-Bounds Read and Write Vulnerability, is listed in CISA's Known Exploited Vulnerabilities Catalog. It was added on June 27, 2022, and the due date for required action is July 18, 2022. The required action is to apply updates per vendor instructions. In simple terms, this vulnerability allows a local user to gain higher privileges on a system by exploiting a flaw in the pkexec program of the polkit package. By manipulating variables, an attacker can execute commands as a privileged user without authentication.

Weakness enumeration

The weakness enumeration summary includes two CWE IDs associated with the vulnerability: CWE-787 (Out-of-bounds Write) and CWE-125 (Out-of-bounds Read). The vulnerability is a local privilege escalation in pkexec due to incorrect handling of the argument vector, affecting the polkit package.

For more details

The CVE-2021-4034 vulnerability is a significant security issue that affects the polkit's pkexec utility, allowing local privilege escalation. Various resources provide in-depth information, mitigation steps, and updates for affected products. For a comprehensive understanding of this vulnerability and its implications, we recommend visiting the National Vulnerability Database page.