Vulnerability Details : CVE-2021-43411
Potential exploit
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.
Products affected by CVE-2021-43411
- cpe:2.3:a:gnu:hurd:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-43411
0.35%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 72 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-43411
Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
---|---|---|---|---|---|---|
8.5
|
HIGH | AV:N/AC:M/Au:S/C:C/I:C/A:C |
6.8
|
10.0
|
NIST | |
7.5
|
HIGH | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H |
1.6
|
5.9
|
NIST |
CWE ids for CVE-2021-43411
-
The product contains a concurrent code sequence that requires temporary, exclusive access to a shared resource, but a timing window exists in which the shared resource can be modified by another code sequence operating concurrently.Assigned by: nvd@nist.gov (Primary)
References for CVE-2021-43411
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https://salsa.debian.org/hurd-team/hurd/-/blob/4d1b079411e2f40576e7b58f9b5b78f733a2beda/debian/patches/0034-proc-Use-UIDs-for-evaluating-permissions.patch
debian/patches/0034-proc-Use-UIDs-for-evaluating-permissions.patch · 4d1b079411e2f40576e7b58f9b5b78f733a2beda · Maintaining of the Hurd / hurd · GitLabMailing List;Patch;Third Party Advisory
-
https://lists.gnu.org/archive/html/bug-hurd/2021-05/msg00079.html
How do I disclose a vulnerability?Exploit;Mailing List;Vendor Advisory
-
https://www.mail-archive.com/bug-hurd@gnu.org/msg32112.html
[VULN 3/4] setuid exec raceExploit;Vendor Advisory
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