Francisco Amato evilgrade, "You have pending upgrades..."
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1 Francisco Amato evilgrade, "You have pending upgrades..."
2 Introduction Topics Client side explotation Update process Poor implementation of update processes Attack vectors evilgrade framework presentation
3 Introduction Client side explotation Searching the Weakest Link Bypassing the fortress walls This technique allows for example transform a user terminal in a proxy to access the internal network of a company
4 General application s update process How does it works? Update process are either manual or automatic. The process requests a special file in the master server for example update.application. com/info.xml The file has the internal information of the available updates. It s installed automatic or ask if you like to install the new update.
5 What s the problem?
6 Is there any problem? Trust A lot of application don t verify the updates contents. They blindly trust without verification of the master update server.
7 evilgrade Tool Information evilgrade is modular framework that allow us to take advantage of poor update implementations by injecting fake updates. It s a opensource project It s developed in Perl
8 evilgrade How does it work? It works with modules, each module implements the structure needed to emulate a false update of specific application. evilgrade needs the manipulation of the victims s dns traffic
9 evilgrade Normal update process 1. App1 start the update process 2. Consult to the dns server host update.app1.com 3. DNS server replies App gets the file lastupdate.xml from update.app1. com 5. App analyzes the update file and detect a new update 6. App1 downloads and execute the update http: //update.app1.com/update.exe
10 evilgrade Attack example 1. App1 starts the update process 2. Consult to the dns server host update.app1.com 3. The attacker modifies the DNS traffic and returns other ip address, controlled by the attacker. 4. App1 get the file controlled by the attacker http: //update.app1.com/lastupdate.xml 5. App1 processes the file and detect a new update 6. App1 downloads and execute the backdoor http: //update.app1.com/backdoor.exe
11 Attack vectors? Possibilities: Internal scenery: Internal DNS access. - ARP spoofing. DNS Cache Poisoning. External scenery: Internal DNS access. - DNS Cache Poisoning.
12 ARP spoofing Description Layer 2 traffic re-routing (MITM)
13 DNS Request Description
14 DNS Cache poisoning Attack
15 DNS Cache poisoning Nothing is easy Taking care of: TTL. Cache. Legitimizes response. Needed information: - Source. ID 16 bits (65535 possibilities).
16 Internal scenery Sample Topology
17 External scenery Sample Topology
18 evilgrade Is this new? No, it s not. The idea of the framework is the centralization and explotation of different update implementations all together in one tool.
19 evilgrade What are the supported OS? The framework is multiplatform, it only depends of having the rigth payload for the platform to exploit.
20 evilgrade What can I do with it? This attack vector allows the injection of fake updates to remotely access a target system.
21 evilgrade Console: It works similar to a IOS console: -show <object>: Used to show different information. -conf <object>: Enter to the configure mode. -set <option> value : Configures different options. -start: Webserver starts. -stop: Webserver stops. -status: Webserver status.
22 evilgrade Modules:.
23 evilgrade Request: It s an object s collection. Each object it s a possible HTTP request inside the virtualhost configured for the module.
24 evilgrade Request: Each object has: <req> - requeried URL (regex friendly). <type> : [ file string agent install ] <method> : [GET POST TEST ] <bin> : [1 ] If is it a binary file. <string> : String request s response <parse> : [1 ] If this file or string need be parsed <file> : The path of the request s response
25 evilgrade Options:.
26 evilgrade Agent: Agent is the fake update to be injected in the victims s computer.
27 evilgrade Implemented modules: - Java plugin - Winzip - Winamp MacOS - OpenOffices - itunes - linkedin toolbar - DAP (download accelerator) - notepad++ - speedbit
28 Lab Time for the demo. Cool!
29 evilgrade A more secure approach Update server running under https, certificate control. Digital signatures, verify the update with a public key
30 References More Info
31 Questions!???
32 Thanks! Contact blog.infobyte.com.ar Francisco Amato
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