CVE-2021-3560 on CISA KEV

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

01What CISA says about this 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.

02Required action — verbatim from CISA

Apply updates per vendor instructions.

03Notes & references

• bugzilla.redhat.com — https://bugzilla.redhat.com/show_bug.cgi?id=1961710
• github.blog — https://github.blog/2021-06-10-privilege-escalation-polkit-root-on-linux-with-bu…
• packetstormsecurity.com — http://packetstormsecurity.com/files/172836/polkit-Authentication-Bypass.html
• packetstormsecurity.com — http://packetstormsecurity.com/files/172846/Facebook-Fizz-Denial-Of-Service.html

04SARA's analyst layer — why this matters

This vulnerability is currently on the CISA KEV list, which CISA only adds CVEs to when there is reliable evidence of active exploitation in the wild. For federal civilian agencies, BOD 22-01 requires remediation by the due date above. For everyone else, KEV is the strongest "patch immediately" signal you can get from public threat intel.

05Affected products (summary)

Vendor	Product	Versions
n	a / polkit	polkit 0.119

06Detection

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