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rule(falco_rules): Polkit Local Privilege Escalation Vulnerability (CVE-2021-4034) #1877

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merged 3 commits into from
Feb 11, 2022
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rule(falco_rules): Polkit Local Privilege Escalation Vulnerability (CVE-2021-4034) #1877

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d958fd7
Added new Rule Polkit Local Privilege Escalation Vulnerability (CVE-2…
darryk10 Jan 28, 2022
973fa44
Fixed rule condition
darryk10 Jan 31, 2022
3e0f04f
Update rules/falco_rules.yaml
darryk10 Feb 2, 2022
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11 changes: 11 additions & 0 deletions rules/falco_rules.yaml
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Expand Up @@ -3120,6 +3120,17 @@
priority: NOTICE
tags: [network, process, mitre_command_and_control]

# This rule helps detect CVE-2021-4034:
# A privilege escalation to root through memory corruption
- rule: Polkit Local Privilege Escalation Vulnerability (CVE-2021-4034)
desc: "This rule detects an attempt to exploit a privilege escalation vulnerability in Polkit's pkexec. By running specially crafted code, a local user can leverage this flaw to gain root privileges on a compromised system"
condition:
spawned_process and user.uid != 0 and proc.name=pkexec and proc.args = ''
output:
"Detect Polkit pkexec Local Privilege Escalation Exploit (CVE-2021-4034) (user=%user.loginname uid=%user.loginuid command=%proc.cmdline args=%evt.args)"
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priority: CRITICAL
tags: [process, mitre_privilege_escalation]

# Application rules have moved to application_rules.yaml. Please look
# there if you want to enable them by adding to
# falco_rules.local.yaml.
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