Netgate pfSense CE 2.5.0 through 2.9.0 contains an OS command injection vulnerability in openvpn.learn-address.sh that allows authenticated VPN clients to execute commands as the unbound user. Attackers can embed shell metacharacters in the certificate common name or username, which is interpolated unquoted into su -c strings, when DNS Resolver client registration is enabled.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
High
Difficult to exploit
Attack Requirements
Present
Additional conditions required
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
Low
Partial data leak
Integrity
Low
Partial data modification
Availability
Low
Partial disruption
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:*:*:*
|
2.5.0
|
<= 2.9.0
|
References 4
https://abraxaslabs.tech/research/pfsense-ce-leftovers
disclosure@vulncheck.com
https://github.com/abraxas/pfsense-ovpn-learn-cn
disclosure@vulncheck.com
https://github.com/pfsense/pfsense/blob/9363ac5b8651a1c7a333180425ce7719070f95f…
disclosure@vulncheck.com
https://www.vulncheck.com/advisories/netgate-pfsense-ce-2.5.0-through-2.9.0-os-…
disclosure@vulncheck.com