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pfsense-crash-reporter-xss — pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - crash_reporter textarea | Kitploit
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GitHubabraxas/pfsense-crash-reporter-xss

pfsense-crash-reporter-xss

pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - XSS - crash_reporter textarea

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3 days agoNot yet reviewed

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Abraxas Labs - pfsense-crash-reporter-xss

abraxaslabs.tech  ·  github.com/abraxas  ·  @abraxas_null  ·  [email protected]  ·  pfsense-crash-reporter-xss

pfsense-crash-reporter-xss

Class: XSS Reach: Remote

pfSense CE 2.9.0-DEVELOPMENT (9363ac5) - pfsense.org

/tmp/PHP_errors.log goes through htmlspecialchars. /var/crash/* is file_get_contents into <?=$crash_reports?> with no encode.

IDno CVE yet
ClassXSS
ReachRemote (authenticated WebGUI unless noted)
CWECWE-79
CVSSMedium: 5.4 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
ProductpfSense CE
Affected2.9.0-DEVELOPMENT (9363ac5b8651a1c7a333180425ce7719070f95f9)
AuthWebGUI session with page-diagnostics-crash-reporter
LicenseGNU Affero GPL v3.0
Lab127.0.0.1 only

I pinned public master 9363ac5. The lab is a PHP gadget of the pinned sink, loopback HTTP on 127.0.0.1:19180.

Series write-up: https://abraxaslabs.tech/research/pfsense-ce-leftovers

What an attacker can do

MethodSinkPrivilege
GET crash_reporter.php after a crash file with HTMLtextarea>Integrity: Lab-proven: crash blob
same leftoversame sinkRecon: Inferred: stored-from-dump XSS as the GUI user who opens crash reporter.
same leftoversame sinkAvailability: None shown.

Requires: page-diagnostics-crash-reporter. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root.

Requires: page-diagnostics-crash-reporter. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root.

Adjacent surface that stays closed

PHP error log htmlspecialchars.

No Diagnostics: Command unless that page is also granted.

Lab

cd lab
./run.sh

Loopback 127.0.0.1:19180. Compose project pfsense-crash-reporter-xss. Witness PFSENSE-CRASH-REPORTER-XSS-WITNESS. Loopback only: 127.0.0.1:19180. Compose project pfsense-crash-reporter-xss. Witness PFSENSE-CRASH-REPORTER-XSS-WITNESS. PHP gadget of the pinned lines. Stack tears down after the run.

Last line:

SUCCESS PFSENSE-CRASH-REPORTER-XSS control-encoded=yes trigger-raw=yes PFSENSE-CRASH-REPORTER-XSS-WITNESS

Fix

htmlspecialchars crash blobs in the textarea.

References

  • github.com/pfsense/pfsense 9363ac5b8651a1c7a333180425ce7719070f95f9
  • CWE-79
  • Series: https://abraxaslabs.tech/research/pfsense-ce-leftovers
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