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CVE-2021-20197

Date: March 26, 2021

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.

Language: C

Severity Score

Related Resources (11)

https://security.netapp.com/advisory/ntap-20210528-0009/
https://security-tracker.debian.org/tracker/CVE-2021-20197
https://nvd.nist.gov/vuln/detail/CVE-2021-20197
https://people.canonical.com/~ubuntu-security/cve/CVE-2021-20197
https://access.redhat.com/security/cve/CVE-2021-20197
https://bugzilla.redhat.com/show_bug.cgi?id=1913743
https://github.com/bminor/binutils-gdb/commit/365f5fb6d0f0da83817431a275e99e6f6babbe04
https://security.gentoo.org/glsa/202208-30
https://access.redhat.com/errata/RHSA-2021:4364
https://sourceware.org/bugzilla/show_bug.cgi?id=26945
https://www.mend.io/vulnerability-database/CVE-2021-20197

Severity Score

Weakness Type (CWE)

Improper Link Resolution Before File Access ('Link Following')

CWE-59

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

CWE-362

CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): HIGH
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): HIGH
Availability (A): NONE

CVSS v2

Base Score:
Access Vector (AV): LOCAL
Access Complexity (AC): MEDIUM
Authentication (AU): NONE
Confidentiality (C): PARTIAL
Integrity (I): PARTIAL
Availability (A): NONE
Additional information:

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