CVE-2020-11457 — pfSense before 2

pfSense before 2.4.5 has stored XSS in system_usermanager_addprivs.php in the WebGUI via the descr parameter (aka full name) of a user.

01What is this vulnerability?

pfSense before 2.4.5 has stored XSS in system_usermanager_addprivs.php in the WebGUI via the descr parameter (aka full name) of a user.

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: 2020-04-01T15:47:58.000Z
• Last modified: 2024-08-04T11:28:14.125Z

09References

• www.netgate.com — https://www.netgate.com/assets/downloads/advisories/pfSense-SA-20_06.webgui.asc
• github.com — https://github.com/pfsense/pfsense/commit/3c1e53dabe966f27c9097a5a923e77f49ae5ff…
• packetstormsecurity.com — http://packetstormsecurity.com/files/157104/pfSense-2.4.4-P3-User-Manager-Cross-…
• www.exploit-db.com — https://www.exploit-db.com/exploits/48300