Moderate
CVE-2021-29449
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CVE-2021-29449
MITRE ATT&CK
Collection
Command and Control
Credential Access
Defense Evasion
Discovery
Execution
Exfiltration
Impact
Initial Access
Lateral Movement
Persistence
Privilege Escalation
Topic Tags
Description
Pi-hole is a Linux network-level advertisement and Internet tracker blocking application. Multiple privilege escalation vulnerabilities were discovered in version 5.2.4 of Pi-hole core. See the referenced GitHub security advisory for details.
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Ratings
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Attacker ValueMedium
-
ExploitabilityHigh
Technical Analysis
There are 3 vulnerabilities associated with this CVE, all are priv esc. All three use the same simple trick to execute while being sent to sed from the command line. www-data by default is listed in the sudoers file to run pihole.
removestaticdhcp command requires /etc/dnsmasq.d/04-pihole-static-dhcp.conf, and is exploitable from 3.0-5.2.4.
removecustomdns command requires /etc/pihole/custom.list, and is exploitable from 5.1-5.2.4.
removecustomcname command requires /etc/dnsmasq.d/05-pihole-custom-cname.conf, and is exploitable from 5.0-5.2.4.
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CVE ID
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