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pfsense-rss-file-redirect — pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - File read - RSS file:// redirect | Kitploit
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GitHubabraxas/pfsense-rss-file-redirect

pfsense-rss-file-redirect

pfSense CE 2.9.0-DEVELOPMENT - Medium - Remote - File read - RSS file:// redirect

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43 days agoNot yet reviewed

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Abraxas Labs - pfsense-rss-file-redirect

abraxaslabs.tech  ·  github.com/abraxas  ·  @abraxas_null  ·  [email protected]  ·  pfsense-rss-file-redirect

pfsense-rss-file-redirect

Class: File read Reach: Remote

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

is_URL() is not HTTP-only. SimplePie fix_protocol() rewrites direct file:// to http. Recursive 3xx Location: file:/// does not call fix_protocol() and file_get_contents the path as root.

IDno CVE yet
ClassFile read
ReachRemote (authenticated WebGUI unless noted)
CWECWE-73
CVSSMedium: 6.5 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
ProductpfSense CE
Affected2.9.0-DEVELOPMENT (9363ac5b8651a1c7a333180425ce7719070f95f9)
AuthWebGUI session with page-dashboard-all / widgets MATCH
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 127.0.0.1:19100.

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

What an attacker can do

MethodSinkPrivilege
Dashboard RSS save of an HTTP URL that 302s to file://SimplePie File recursive Location file_get_contentsIntegrity: None. Read only.
same leftoversame sinkRecon: Lab-proven: HTTP 302 Location: file:/// returned planted XML. Direct file:// rewritten away.
same leftoversame sinkAvailability: None shown.

Requires: page-dashboard-all / widgets MATCH. CSRF-magic on POST unless noted. WebGUI PHP-FPM is root.

Requires: page-dashboard-all / widgets MATCH. 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

26_04 title encode on this pin. Operator HTTP(S) feed URL is the feature. Direct file:// rewrite.

No Diagnostics: Command unless that page is also granted.

Lab

cd lab
./run.sh

Loopback 127.0.0.1:19100. Compose project pfsense-rss-file-redirect. Witness PFSENSE-RSS-FILE-REDIRECT-WITNESS. Loopback only: 127.0.0.1:19100. Compose project pfsense-rss-file-redirect. Witness PFSENSE-RSS-FILE-REDIRECT-WITNESS. PHP gadget of the pinned lines. Stack tears down after the run.

Last line:

SUCCESS PFSENSE-RSS-FILE-REDIRECT control-rewritten-away=yes trigger-file-location=yes PFSENSE-RSS-FILE-REDIRECT-WITNESS

Fix

Force HTTP(S) feeds. Do not follow file: Location. CURLOPT_PROTOCOLS HTTP(S).

References

  • github.com/pfsense/pfsense 9363ac5b8651a1c7a333180425ce7719070f95f9
  • CWE-73
  • Series: https://abraxaslabs.tech/research/pfsense-ce-leftovers
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