CVE-2020-2950 PoC — Oracle Fusion Middleware和Oracle Business Intelligence Enterprise Edition 安全漏洞

Source

https://github.com/tuo4n8/CVE-2020-2950

Associated Vulnerability

Title: Oracle Fusion Middleware和Oracle Business Intelligence Enterprise Edition 安全漏洞 (CVE-2020-2950)
Description:Vulnerability in the Oracle Business Intelligence Enterprise Edition product of Oracle Fusion Middleware (component: Analytics Web General). Supported versions that are affected are 5.5.0.0.0, 11.1.1.9.0, 12.2.1.3.0 and 12.2.1.4.0. Easily exploitable vulnerability allows unauthenticated attacker with network access via HTTP to compromise Oracle Business Intelligence Enterprise Edition. Successful attacks of this vulnerability can result in takeover of Oracle Business Intelligence Enterprise Edition. CVSS 3.0 Base Score 9.8 (Confidentiality, Integrity and Availability impacts). CVSS Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H).

Readme

# Oracle-BI (CVE-2020-2950) 

## AMF deseiralize

> **Version:**  5.5.0.0.0, 11.1.1.9.0, 12.2.1.3.0
>
> **Install:**https://www.sql.edu.vn/obiee/oracle-business-intelligence-12c/
>
> **Ref:** https://peterjson.medium.com/cve-2020-2950-turning-amf-deserialize-bug-to-java-deserialize-bug-2984a8542b6f

---

---

## Exploit - PoC

> [amf.bin](https://github.com/tuo4n8/CVE-2020-2950/blob/main/amf.bin)
>
> Header cmd with base64 and child !!

![](README.assets/rce.jpg)

---

## Debug trace bug

URL: `/analytics/jbips/messagebroker/cs/`

- Handle request -> processCall()

![image-20210521104317854](take-note.assets/image-20210521104317854.png)

- Get inputstream -> deserialize AMF package

![image-20210521104423834](take-note.assets/image-20210521104423834.png)

- Get Object AMF -> deserilize

![image-20210521104538758](take-note.assets/image-20210521104538758.png)

![image-20210521104730919](take-note.assets/image-20210521104730919.png)

![image-20210521104755256](take-note.assets/image-20210521104755256.png)

![image-20210521104844150](take-note.assets/image-20210521104844150.png)

- If matching type -> AMF readobject (AMF3DATA.class)

![image-20210521104956342](take-note.assets/image-20210521104956342.png)

- AMF3DATA.class -> AMF3ObjectInput
- In AMF3ObjectInut -> readComplexObject

![image-20210521105409912](take-note.assets/image-20210521105409912.png)

- In readComplexObject: 
  - If class deseriliaze is externalizable -> radExternalchain
  - else setFiled

![image-20210521105523270](take-note.assets/image-20210521105523270.png)

- AMF deserialize  chain -> readExternal Chain

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