Vulnerability Details : CVE-2021-20197
There is an open race window when writing output in the following utilities in GNU binutils version 2.35 and earlier:ar, objcopy, strip, ranlib. When these utilities are run as a privileged user (presumably as part of a script updating binaries across different users), an unprivileged user can trick these utilities into getting ownership of arbitrary files through a symlink.
Products affected by CVE-2021-20197
- cpe:2.3:o:redhat:enterprise_linux:8.0:*:*:*:*:*:*:*
- cpe:2.3:a:gnu:binutils:*:*:*:*:*:*:*:*
- cpe:2.3:o:broadcom:brocade_fabric_operating_system_firmware:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:cloud_backup:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:ontap_select_deploy_administration_utility:-:*:*:*:*:*:*:*
- cpe:2.3:a:netapp:solidfire_\&_hci_management_node:-:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-20197
0.18%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 37 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-20197
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
3.3
|
LOW | AV:L/AC:M/Au:N/C:P/I:P/A:N |
3.4
|
4.9
|
NIST | |
|
6.3
|
MEDIUM | CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N |
1.0
|
5.2
|
NIST |
CWE ids for CVE-2021-20197
-
The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.Assigned by:
- nvd@nist.gov (Secondary)
- secalert@redhat.com (Primary)
-
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 (Secondary)
References for CVE-2021-20197
-
https://sourceware.org/bugzilla/show_bug.cgi?id=26945
26945 – (CVE-2021-20197) Unsafe chown+chmod in smart_rename, possibly elsewhereIssue Tracking;Patch;Third Party Advisory
-
https://security.gentoo.org/glsa/202208-30
GNU Binutils: Multiple Vulnerabilities (GLSA 202208-30) — Gentoo securityThird Party Advisory
-
https://bugzilla.redhat.com/show_bug.cgi?id=1913743
1913743 – (CVE-2021-20197) CVE-2021-20197 binutils: race window allows users to own arbitrary filesIssue Tracking;Patch;Third Party Advisory
-
https://security.netapp.com/advisory/ntap-20210528-0009/
CVE-2021-20197 GNU Binutils Vulnerability in NetApp Products | NetApp Product SecurityThird Party Advisory
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