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CVE

CVE-2021-3560

Red Hat Polkit Incorrect Authorization Vulnerability

It was found that polkit could be tricked into bypassing the credential checks for D-Bus requests, elevating the privileges of the requestor to the root user. This flaw could be used by an unprivileged local attacker to, for example, create a new local administrator. The highest threat from this vulnerability is to data confidentiality and integrity as well as system availability.

HIGH · CVSS 7.8 ⚠ CISA KEV EPSS 0.091
Act now
  • Listed on CISA KEV (known exploited in the wild)
  • SSVC exploitation status: active
  • EPSS percentile: top 7% of all CVEs by exploitation likelihood
  • Public exploit or PoC is available
  • CVSS base score ≥ 7.0
Sigma rules1 YARA rules0
⬢

Required Remediation

Apply updates per vendor instructions.

⬡

Weakness Classification

CWE-754Improper Check for Unusual or Exceptional Conditions
CWE-863Incorrect Authorization
▤

Affected Products & Versions

6
polkit project polkit< 0.119
debian linuxall versions
canonical ubuntu linuxall versions
redhat virtualizationall versions
redhat virtualization hostall versions
redhat openshift container platformall versions
⚠

Public Exploits & PoCs

4
localPolkit 0.105-26 0.117-2 - Local Privilege Escalationverified
pocpacketstormsecurity.com · polkit-Authentication-Bypass.htmlpacketstormsecurity.com
pocpacketstormsecurity.com · Facebook-Fizz-Denial-Of-Service.htmlpacketstormsecurity.com
pocgithub.blog · 2021-06-10-privilege-escalation-polkit-root-on-linux-with...github.blog
◈

Sigma Hunt Rules

1
Exact rules name this CVE ID. Product rules name an affected product in their title. Related rules cover techniques used by actors who exploited this CVE. Showing the most relevant matches; the complete related set is on the full drill-down.
productmediumPowershell Detect Virtualization Environment
▣

Scoring & Timeline

7.8
HIGH · 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 NVD16 Feb 2022 · 07:15 PM
CVSS VectorCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC triage · cisa-vulnrichment
Exploitation
active
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

15
suse-csafopenSUSE-SU-2024:11180-1
cisaKEV-CVE-2021-3560
msrcCVE-2021-3560
suse-csafopenSUSE-SU-2021:1843-1
rhsaRHSA-2021:2555Important
🔗

References & Sources

1
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-3560US Government Resource
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