Netgate pfSense CE through 2.9.0 contains an OS command injection vulnerability that allows authenticated users with Virtual IP edit privileges to execute commands as root by storing an unvalidated CARP VHID. Attackers can supply a VHID containing shell metacharacters that executes via interface_ipalias_configure() ifconfig calls or get_carp_interface_status() when CARP status is rendered.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Attack Requirements
None
No additional conditions
Privileges Required
High
Admin privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v4.0
Weakness Type (CWE)
Vulnerable Products 1
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Pfsense Pfsense
cpe:2.3:a:pfsense:pfsense:*:*:*:*:community:*:*:*
|
— |
<= 2.9.0
|
References 7
https://abraxaslabs.tech/research/pfsense-carp-vhid
disclosure@vulncheck.com
https://abraxaslabs.tech/research/pfsense-ce-leftovers
disclosure@vulncheck.com
https://github.com/abraxas/pfsense-carp-vhid
disclosure@vulncheck.com
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f…
disclosure@vulncheck.com
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f…
disclosure@vulncheck.com
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f…
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/netgate-pfsense-ce-through-2.9.0-os-comman…
disclosure@vulncheck.com