CVE-2021-43411

Public Exploit

Description

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.

Category

7.5
CVSS
Severity: High
CVSS 3.1 •
CVSS 2.0 •
EPSS 0.44%
Vendor Advisory gnu.org
Affected: n/a n/a
Published at:
Updated at:

References

Link Tags
https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.html mailing list exploit vendor advisory
https://www.mail-archive.com/bug-hurd%40gnu.org/msg32112.html
https://salsa.debian.org/hurd-team/hurd/-/blob/4d1b079411e2f40576e7b58f9b5b78f733a2beda/debian/patches/0034-proc-Use-UIDs-for-evaluating-permissions.patch mailing list third party advisory patch

Frequently Asked Questions

What is the severity of CVE-2021-43411?
CVE-2021-43411 has been scored as a high severity vulnerability.
How to fix CVE-2021-43411?
To fix CVE-2021-43411, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-43411 being actively exploited in the wild?
It is possible that CVE-2021-43411 is being exploited or will be exploited in a near future based on public information. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
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