Home/CVE/There is an open race window when writing output in the following utilities in GNU binutils version 2.35 and earlier:ar,
CVE

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,

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.

MEDIUM · CVSS 6.3 EPSS 0.00115
Monitor
  • No active-exploitation, high-EPSS, or public-exploit signals - routine patching cadence
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')
CWE-59Improper Link Resolution Before File Access ('Link Following')
CWE-59Improper Link Resolution Before File Access ('Link Following')
▤

Affected Products & Versions

6
gnu binutils<= 2.35
redhat enterprise linuxall versions
netapp cloud backupall versions
netapp ontap select deploy administration utilityall versions
netapp solidfire \& hci management nodeall versions
broadcom brocade fabric operating system firmwareall versions
▣

Scoring & Timeline

6.3
MEDIUM · CVSS v3.1 · secalert@redhat.com
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD26 Mar 2021 · 05:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N
SSVC triage · cisa-vulnrichment
Exploitation
none
Automatable
no
Technical impact
total
SSVC asks the questions that actually drive patch urgency: is it being exploited, can attacks be automated, and how total is the impact.
⚑

Vendor Advisories

8
suse-csafopenSUSE-SU-2024:10651-1
suse-csafSUSE-SU-2022:0934-1
suse-csafopenSUSE-SU-2021:1475-1
suse-csafopenSUSE-SU-2021:3616-1
suse-csafSUSE-SU-2021:3616-1
🔗

References & Sources

4
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://bugzilla.redhat.com/show_bug.cgi?id=1913743Issue TrackingPatchThird Party Advisory
https://security.gentoo.org/glsa/202208-30Third Party Advisory
https://security.netapp.com/advisory/ntap-20210528-0009/Third Party Advisory
https://sourceware.org/bugzilla/show_bug.cgi?id=26945Issue TrackingPatchThird Party Advisory
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