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Time-of-check Time-of-use (TOCTOU) Affecting sudo package, versions <0:1.8.29-7.el8

Severity

 Recommended
low

Based on CentOS security rating

    Threat Intelligence

    EPSS
    0.1% (42nd percentile)

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  • Snyk ID SNYK-CENTOS8-SUDO-2102882
  • published 26 Jul 2021
  • disclosed 11 Jan 2021
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Introduced: 11 Jan 2021

CVE-2021-23240 Open this link in a new tab
CWE-367 Open this link in a new tab
CWE-59 Open this link in a new tab

How to fix?

Upgrade Centos:8 sudo to version 0:1.8.29-7.el8 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream sudo package and not the sudo package as distributed by Centos. See How to fix? for Centos:8 relevant fixed versions and status.

selinux_edit_copy_tfiles in sudoedit in Sudo before 1.9.5 allows a local unprivileged user to gain file ownership and escalate privileges by replacing a temporary file with a symlink to an arbitrary file target. This affects SELinux RBAC support in permissive mode. Machines without SELinux are not vulnerable.

References

CVSS Scores

version 3.1
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NVD

7.8 high
  • Attack Vector (AV)
    Local
  • Attack Complexity (AC)
    Low
  • Privileges Required (PR)
    Low
  • User Interaction (UI)
    None
  • Scope (S)
    Unchanged
  • Confidentiality (C)
    High
  • Integrity (I)
    High
  • Availability (A)
    High
Expand this section

Red Hat

7.8 high
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SUSE

7.8 high