CVE-2022-31814 — pfSense pfBlockerNG through 2

pfSense pfBlockerNG through 2.1.4_26 allows remote attackers to execute arbitrary OS commands as root via shell metacharacters in the HTTP Host header. NOTE: 3.x is unaffected.

01What is this vulnerability?

pfSense pfBlockerNG through 2.1.4_26 allows remote attackers to execute arbitrary OS commands as root via shell metacharacters in the HTTP Host header. NOTE: 3.x is unaffected.

02Affected products

Vendor	Product	Versions
n	a / n/a	n/a

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2022-09-05T00:00:00.000Z
• Last modified: 2024-08-03T07:26:01.300Z

09References

• docs.netgate.com — https://docs.netgate.com/pfsense/en/latest/packages/pfblocker.html
• www.ihteam.net — https://www.ihteam.net/advisory/pfblockerng-unauth-rce-vulnerability/
• packetstormsecurity.com — http://packetstormsecurity.com/files/168743/pfSense-pfBlockerNG-2.1.4_26-Shell-U…
• packetstormsecurity.com — http://packetstormsecurity.com/files/171123/pfBlockerNG-2.1.4_26-Remote-Code-Exe…
• github.com — https://github.com/pfsense/FreeBSD-ports/pull/1169
• github.com — https://github.com/pfsense/FreeBSD-ports/pull/1169/commits/071bdcf2d918c3e51cde1…