What is the severity of CVE-2021-43411?

CVE-2021-43411 is considered to have a critical severity due to its potential for gaining full root access.

How do I fix CVE-2021-43411?

To fix CVE-2021-43411, update your GNU Hurd installation to version 0.9 20210404-9 or later.

What types of systems are affected by CVE-2021-43411?

CVE-2021-43411 affects all versions of GNU Hurd prior to 0.9 20210404-9.

What is the impact of CVE-2021-43411?

The impact of CVE-2021-43411 allows an attacker to exploit a vulnerability in setuid executables to gain elevated privileges.

Is there any workaround for CVE-2021-43411?

There are no known workarounds for CVE-2021-43411; updating to the patched version is necessary.

Vulnerability/
CVE-2021-43411

high

8.5

CWE

362

7/11/2021

21/11/2024

CVE-2021-43411: Race Condition

First published: Sun Nov 07 2021(Updated: )

An issue was discovered in GNU Hurd before 0.9 20210404-9. When trying to exec a setuid executable, there's a window of time when the process already has the new privileges, but still refers to the old task and is accessible through the old process port. This can be exploited to get full root access.

Credit: cve@mitre.org cve@mitre.org

Affected Software	Affected Version	How to fix
GNU Hurd	<0.9.20210404-9
	<0.9.20210404-9

Remedy

https://salsa.debian.org/hurd-team/hurd/-/blob/4d1b079411e2f40576e7b58f9b5b78f733a2beda/debian/patches/0034-proc-Use-UIDs-for-evaluating-permissions.patch

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2021-43411?
CVE-2021-43411 is considered to have a critical severity due to its potential for gaining full root access.
How do I fix CVE-2021-43411?
To fix CVE-2021-43411, update your GNU Hurd installation to version 0.9 20210404-9 or later.
What types of systems are affected by CVE-2021-43411?
CVE-2021-43411 affects all versions of GNU Hurd prior to 0.9 20210404-9.
What is the impact of CVE-2021-43411?
The impact of CVE-2021-43411 allows an attacker to exploit a vulnerability in setuid executables to gain elevated privileges.
Is there any workaround for CVE-2021-43411?
There are no known workarounds for CVE-2021-43411; updating to the patched version is necessary.

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