CVE-2017-7921 PoC — 多款Hikvision产品安全漏洞

Source

https://github.com/chrisjd20/hikvision_CVE-2017-7921_auth_bypass_config_decryptor

Associated Vulnerability

Title:多款Hikvision产品安全漏洞 (CVE-2017-7921)
Description:An Improper Authentication issue was discovered in Hikvision DS-2CD2xx2F-I Series V5.2.0 build 140721 to V5.4.0 build 160530, DS-2CD2xx0F-I Series V5.2.0 build 140721 to V5.4.0 Build 160401, DS-2CD2xx2FWD Series V5.3.1 build 150410 to V5.4.4 Build 161125, DS-2CD4x2xFWD Series V5.2.0 build 140721 to V5.4.0 Build 160414, DS-2CD4xx5 Series V5.2.0 build 140721 to V5.4.0 Build 160421, DS-2DFx Series V5.2.0 build 140805 to V5.4.5 Build 160928, and DS-2CD63xx Series V5.0.9 build 140305 to V5.3.5 Build 160106 devices. The improper authentication vulnerability occurs when an application does not adequately or correctly authenticate users. This may allow a malicious user to escalate his or her privileges on the system and gain access to sensitive information.

Description

This python file will decrypt the configurationFile used by hikvision cameras vulnerable to CVE-2017-7921.

Readme

# hikvision_CVE-2017-7921_auth_bypass_config_decryptor
This python file will decrypt the configurationFile used by hikvision cameras vulnerable to CVE-2017-7921.

https://www.checkpoint.com/defense/advisories/public/2017/cpai-2017-0876.html/

# Description 

Hikvision IP Cameras Authentication Bypass (CVE-2017-7921)

Basically, hikvision cameras that are vulnerable to the CVE listed above, can have several routes exposed by using a simple base64 string supplied as an argument in the url. 

For example:

`/System/configurationFile?auth=YWRtaW46MTEK`

This would allow an unauthenticated user to download the config file for the camera which includes user information. This configuration file uses weak encryption and a static key by default.

The python script supplied, will decrypt this configuration file. 

I also supply a sample generated example configuration file for you to test. 

# How To Use

`./decrypt_configurationFile.py <nameofdownloadedconfig>`


# Dependencies:

`sudo python3 -m pip install pycryptodome`

**Tested on Ubunut 20.04 with python 3.8.5**

File Snapshot

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