SGIA Eagles' Nest: May 2020

Friday, May 22, 2020

New DNS Vulnerability Lets Attackers Launch Large-Scale DDoS Attacks

Israeli cybersecurity researchers have disclosed details about a new flaw impacting DNS protocol that can be exploited to launch amplified, large-scale distributed denial-of-service (DDoS) attacks to takedown targeted websites. Called NXNSAttack, the flaw hinges on the DNS delegation mechanism to force DNS resolvers to generate more DNS queries to authoritative servers of attacker's choice,

via The Hacker News

Related word

[Guide] Finding Best Security Outsourcing Alternative For Your Organization

As cyberattacks continue to proliferate in volume and increase in sophistication, many organizations acknowledge that some part of their breach protection must be outsourced, introducing a million-dollar question of what type of service to choose form. Today, Cynet releases the Security Outsourcing Guide (download here), providing IT Security executives with clear and actionable guidance on

via The Hacker News

Related word

Thursday, May 21, 2020

Discover: A Custom Bash Scripts Used To Perform Pentesting Tasks With Metasploit

About discover: discover is a custom bash scripts used to automate various penetration testing tasks including recon, scanning, parsing, and creating malicious payloads and listeners with Metasploit Framework. For use with Kali Linux, Parrot Security OS and the Penetration Testers Framework (PTF).

About authors:

Lee Baird: @discoverscripts
Jay "L1ghtn1ng" Townsend: @jay_townsend1
Jason Ashton: @ninewires

discover Installation and Updating

About RECON in discover
Domain

RECON


 1. Passive

2. Active
3. Import names into an existing recon-ng workspace
4. Previous menu

Passive uses ARIN, dnsrecon, goofile, goog-mail, goohost, theHarvester, Metasploit Framework, URLCrazy, Whois, multiple websites, and recon-ng.

Active uses dnsrecon, WAF00W, traceroute, Whatweb, and recon-ng.
[*] Acquire API keys for Bing, Builtwith, Fullcontact, GitHub, Google, Hashes, Hunter, SecurityTrails, and Shodan for maximum results with recon-ng and theHarvester.

API key locations:

recon-ng
show keys
keys add bing_api <value>

theHarvester
/opt/theHarvester/api-keys.yaml

Person: Combines info from multiple websites.

RECON


First name:

Last name:

Parse salesforce: Gather names and positions into a clean list.

Create a free account at salesforce (https://connect.data.com/login).
Perform a search on your target company > select the company name > see all.
Copy the results into a new file.

Enter the location of your list:

About SCANNING in discover
Generate target list: Use different tools to create a target list including Angry IP Scanner, arp-scan, netdiscover and nmap pingsweep.

SCANNING

1. Local area network
2. NetBIOS
3. netdiscover
4. Ping sweep
5. Previous menu

CIDR, List, IP, Range, or URL

Type of scan:


1. External

2. Internal
3. Previous menu

External scan will set the nmap source port to 53 and the max-rrt-timeout to 1500ms.
Internal scan will set the nmap source port to 88 and the max-rrt-timeout to 500ms.
Nmap is used to perform host discovery, port scanning, service enumeration and OS identification.
Matching nmap scripts are used for additional enumeration.
Addition tools: enum4linux, smbclient, and ike-scan.
Matching Metasploit auxiliary modules are also leveraged.

About WEB in discover
Insecure direct object reference

Using Burp, authenticate to a site, map & Spider, then log out.
Target > Site map > select the URL > right click > Copy URLs in this host.

Paste the results into a new file.

Enter the location of your file:

Open multiple tabs in Firefox

Open multiple tabs in Firefox with:


1. List

2. Directories from robots.txt.
3. Previous menu

Use a list containing IPs and/or URLs.
Use wget to pull a domain's robot.txt file, then open all of the directories.

Nikto

Run multiple instances of Nikto in parallel.

1. List of IPs.
2. List of IP:port.
3. Previous menu

SSL: Use sslscan and sslyze to check for SSL/TLS certificate issues.

Check for SSL certificate issues.


Enter the location of your list:

About MISC in discover
Parse XML

Parse XML to CSV.


1. Burp (Base64)

2. Nessus (.nessus)
3. Nexpose (XML 2.0)
4. Nmap
5. Qualys
6. revious menu

Generate a malicious payload

Malicious Payloads

1. android/meterpreter/reverse_tcp
2. cmd/windows/reverse_powershell
3. java/jsp_shell_reverse_tcp (Linux)
4. java/jsp_shell_reverse_tcp (Windows)
5. linux/x64/meterpreter_reverse_https
6. linux/x64/meterpreter_reverse_tcp
7. linux/x64/shell/reverse_tcp
8. osx/x64/meterpreter_reverse_https
9. osx/x64/meterpreter_reverse_tcp
10. php/meterpreter/reverse_tcp
11. python/meterpreter_reverse_https 12. python/meterpreter_reverse_tcp
13. windows/x64/meterpreter_reverse_https
14. windows/x64/meterpreter_reverse_tcp
15. Previous menu

Start a Metasploit listener

Metasploit Listeners

1. android/meterpreter/reverse_tcp
2. cmd/windows/reverse_powershell
3. java/jsp_shell_reverse_tcp
4. linux/x64/meterpreter_reverse_https
5. linux/x64/meterpreter_reverse_tcp
6. linux/x64/shell/reverse_tcp
7. osx/x64/meterpreter_reverse_https
8. osx/x64/meterpreter_reverse_tcp
9. php/meterpreter/reverse_tcp
10. python/meterpreter_reverse_https
11. python/meterpreter_reverse_tcp
12. windows/x64/meterpreter_reverse_https
13. windows/x64/meterpreter_reverse_tcp
14. Previous menu

Download discover

Related news

NcN 2015 CTF - theAnswer Writeup

1. Overview

Is an elf32 static and stripped binary, but the good news is that it was compiled with gcc and it will not have shitty runtimes and libs to fingerprint, just the libc ... and libprhrhead
This binary is writed by Ricardo J Rodrigez

When it's executed, it seems that is computing the flag:

But this process never ends .... let's see what strace say:

There is a thread deadlock, maybe the start point can be looking in IDA the xrefs of 0x403a85
Maybe we can think about an encrypted flag that is not decrypting because of the lock.

This can be solved in two ways:

static: understanding the cryptosystem and programming our own decryptor
dynamic: fixing the the binary and running it (hard: antidebug, futex, rands ...)

At first sight I thought that dynamic approach were quicker, but it turned more complex than the static approach.

2. Static approach

Crawling the xrefs to the futex, it is possible to locate the main:

With libc/libpthread function fingerprinting or a bit of manual work, we have the symbols, here is the main, where 255 threads are created and joined, when the threads end, the xor key is calculated and it calls the print_flag:

The code of the thread is passed to the libc_pthread_create, IDA recognize this area as data but can be selected as code and function.

This is the thread code decompiled, where we can observe two infinite loops for ptrace detection and preload (although is static) this antidebug/antihook are easy to detect at this point.

we have to observe the important thing, is the key random?? well, with the same seed the random sequence will be the same, then the key is "hidden" in the predictability of the random.

If the threads are not executed on the creation order, the key will be wrong because is xored with the th_id which is the identify of current thread.

The print_key function, do the xor between the key and the flag_cyphertext byte by byte.

And here we have the seed and the first bytes of the cypher-text:

With radare we can convert this to a c variable quickly:

And here is the flag cyphertext:

And with some radare magics, we have the c initialized array:

radare, is full featured :)

With a bit of rand() calibration here is the solution ...

The code:
https://github.com/NocONName/CTF_NcN2k15/blob/master/theAnswer/solution.c

3. The Dynamic Approach

First we have to patch the anti-debugs, on beginning of the thread there is two evident anti-debugs (well anti preload hook and anti ptrace debugging) the infinite loop also makes the anti-debug more evident:

There are also a third anti-debug, a bit more silent, if detects a debugger trough the first available descriptor, and here comes the fucking part, don't crash the execution, the execution continues but the seed is modified a bit, then the decryption key will not be ok.

Ok, the seed is incremented by one, this could be a normal program feature, but this is only triggered if the fileno(open("/","r")) > 3 this is a well known anti-debug, that also can be seen from a traced execution.

Ok, just one byte patch, seed+=1 to seed+=0, (add eax, 1 to add eax, 0)

before:

after:

To patch the two infinite loops, just nop the two bytes of each jmp $-0

Ok, but repairing this binary is harder than building a decryptor, we need to fix more things:

The sleep(randInt(1,3)) of the beginning of the thread to execute the threads in the correct order
Modify the pthread_cond_wait to avoid the futex()
We also need to calibrate de rand() to get the key (just patch the sleep and add other rand() before the pthread_create loop

Adding the extra rand() can be done with a patch because from gdb is not possible to make a call rand() in this binary.

With this modifications, the binary will print the key by itself.

Wednesday, May 20, 2020

How Do I Get Started With Bug Bounty ?

How do I get started with bug bounty hunting? How do I improve my skills?

These are some simple steps that every bug bounty hunter can use to get started and improve their skills:

Learn to make it; then break it!
A major chunk of the hacker's mindset consists of wanting to learn more. In order to really exploit issues and discover further potential vulnerabilities, hackers are encouraged to learn to build what they are targeting. By doing this, there is a greater likelihood that hacker will understand the component being targeted and where most issues appear. For example, when people ask me how to take over a sub-domain, I make sure they understand the Domain Name System (DNS) first and let them set up their own website to play around attempting to "claim" that domain.

Read books. Lots of books.
One way to get better is by reading fellow hunters' and hackers' write-ups. Follow /r/netsec and Twitter for fantastic write-ups ranging from a variety of security-related topics that will not only motivate you but help you improve. For a list of good books to read, please refer to "What books should I read?".

Join discussions and ask questions.
As you may be aware, the information security community is full of interesting discussions ranging from breaches to surveillance, and further. The bug bounty community consists of hunters, security analysts, and platform staff helping one and another get better at what they do. There are two very popular bug bounty forums: Bug Bounty Forum and Bug Bounty World.

Participate in open source projects; learn to code.
Go to https://github.com/explore or https://gitlab.com/explore/projects and pick a project to contribute to. By doing so you will improve your general coding and communication skills. On top of that, read https://learnpythonthehardway.org/ and https://linuxjourney.com/.

Help others. If you can teach it, you have mastered it.
Once you discover something new and believe others would benefit from learning about your discovery, publish a write-up about it. Not only will you help others, you will learn to really master the topic because you can actually explain it properly.

Smile when you get feedback and use it to your advantage.
The bug bounty community is full of people wanting to help others so do not be surprised if someone gives you some constructive feedback about your work. Learn from your mistakes and in doing so use it to your advantage. I have a little physical notebook where I keep track of the little things that I learnt during the day and the feedback that people gave me.

Learn to approach a target.
The first step when approaching a target is always going to be reconnaissance — preliminary gathering of information about the target. If the target is a web application, start by browsing around like a normal user and get to know the website's purpose. Then you can start enumerating endpoints such as sub-domains, ports and web paths.

A woodsman was once asked, "What would you do if you had just five minutes to chop down a tree?" He answered, "I would spend the first two and a half minutes sharpening my axe."
As you progress, you will start to notice patterns and find yourself refining your hunting methodology. You will probably also start automating a lot of the repetitive tasks.

Related word

CloudFrunt - A Tool For Identifying Misconfigured CloudFront Domains

CloudFrunt is a tool for identifying misconfigured CloudFront domains.

Background

CloudFront is a Content Delivery Network (CDN) provided by Amazon Web Services (AWS). CloudFront users create "distributions" that serve content from specific sources (an S3 bucket, for example).

Each CloudFront distribution has a unique endpoint for users to point their DNS records to (ex. d111111abcdef8.cloudfront.net). All of the domains using a specific distribution need to be listed in the "Alternate Domain Names (CNAMEs)" field in the options for that distribution.

When a CloudFront endpoint receives a request, it does NOT automatically serve content from the corresponding distribution. Instead, CloudFront uses the HOST header of the request to determine which distribution to use. This means two things:

If the HOST header does not match an entry in the "Alternate Domain Names (CNAMEs)" field of the intended distribution, the request will fail.
Any other distribution that contains the specific domain in the HOST header will receive the request and respond to it normally.

This is what allows the domains to be hijacked. There are many cases where a CloudFront user fails to list all the necessary domains that might be received in the HOST header. For example:

The domain "test.disloops.com" is a CNAME record that points to "disloops.com".
The "disloops.com" domain is set up to use a CloudFront distribution.
Because "test.disloops.com" was not added to the "Alternate Domain Names (CNAMEs)" field for the distribution, requests to "test.disloops.com" will fail.
Another user can create a CloudFront distribution and add "test.disloops.com" to the "Alternate Domain Names (CNAMEs)" field to hijack the domain.

This means that the unique endpoint that CloudFront binds to a single distribution is effectively meaningless. A request to one specific CloudFront subdomain is not limited to the distribution it is associated with.

Installation

$ pip install boto3
$ pip install netaddr
$ pip install dnspython
$ git clone https://github.com/disloops/cloudfrunt.git
$ cd cloudfrunt
$ git clone https://github.com/darkoperator/dnsrecon.git

CloudFrunt expects the dnsrecon script to be cloned into a subdirectory called dnsrecon.

Usage

cloudfrunt.py [-h] [-l TARGET_FILE] [-d DOMAINS] [-o ORIGIN] [-i ORIGIN_ID] [-s] [-N]

-h, --help                      Show this message and exit
-s, --save                      Save the results to results.txt
-N, --no-dns                    Do not use dnsrecon to expand scope
-l, --target-file TARGET_FILE   File containing a list of domains (one per line)
-d, --domains DOMAINS           Comma-separated list of domains to scan
-o, --origin ORIGIN             Add vulnerable domains to new distributions with this origin
-i, --origin-id ORIGIN_ID       The origin ID to use with new distributions

Example

$ python cloudfrunt.py -o cloudfrunt.com.s3-website-us-east-1.amazonaws.com -i S3-cloudfrunt -l list.txt

 CloudFrunt v1.0.3

 [+] Enumerating DNS entries for google.com
 [-] No issues found for google.com

 [+] Enumerating DNS entries for disloops.com
 [+] Found CloudFront domain --> cdn.disloops.com
 [+] Found CloudFront domain --> test.disloops.com
 [-] Potentially misconfigured CloudFront domains:
 [#] --> test.disloops.com
 [+] Created new CloudFront distribution EXBC12DE3F45G
 [+] Added test.disloops.com to CloudFront distribution EXBC12DE3F45G

Download CloudFrunt

How To Install Metasploit In Termux

Wirelurker For OSX, iOS (Part I) And Windows (Part II) Samples

PART II

Wirelurker for Windows (WinLurker)

Research: Palo Alto Claud Xiao: Wirelurker for Windows

Sample credit: Claud Xiao

PART I

Research: Palo Alto Claud Xiao WIRELURKER: A New Era in iOS and OS X Malware

Palo Alto |Claud Xiao - blog post Wirelurker

Wirelurker Detector https://github.com/PaloAltoNetworks-BD/WireLurkerDetector

Sample credit: Claud Xiao

Download

Download Part I
Download Part II

Email me if you need the password

List of files

List of hashes

Part II

s+«sìÜ 3.4.1.dmg 925cc497f207ec4dbcf8198a1b785dbd

apps.ipa 54d27da968c05d463ad3168285ec6097
WhatsAppMessenger 2.11.7.exe eca91fa7e7350a4d2880d341866adf35
使用说明.txt 3506a0c0199ed747b699ade765c0d0f8
libxml2.dll c86bebc3d50d7964378c15b27b1c2caa
libiconv-2_.dll 9c8170dc4a33631881120a467dc3e8f7
msvcr100.dll bf38660a9125935658cfa3e53fdc7d65
libz_.dll bd3d1f0a3eff8c4dd1e993f57185be75
mfc100u.dll f841f32ad816dbf130f10d86fab99b1a

zlib1.dll c7d4d685a0af2a09cbc21cb474358595

│ apps.ipa
│ σ╛«σìÜ 3.4.1.dmg
│
└───WhatsAppMessenger 2.11.7
libiconv-2_.dll
libxml2.dll
libz_.dll
mfc100u.dll
msvcr100.dll
WhatsAppMessenger 2.11.7.exe
zlib1.dll
使用说明.txt

Part I

BikeBaron 15e8728b410bfffde8d54651a6efd162
CleanApp c9841e34da270d94b35ae3f724160d5e
com.apple.MailServiceAgentHelper dca13b4ff64bcd6876c13bbb4a22f450
com.apple.appstore.PluginHelper c4264b9607a68de8b9bbbe30436f5f28
com.apple.appstore.plughelper.plist 94a933c449948514a3ce634663f9ccf8
com.apple.globalupdate.plist f92640bed6078075b508c9ffaa7f0a78
com.apple.globalupdate.plist f92640bed6078075b508c9ffaa7f0a78
com.apple.itunesupdate.plist 83317c311caa225b17ac14d3d504387d
com.apple.machook_damon.plist 6507f0c41663f6d08f497ab41893d8d9
com.apple.machook_damon.plist 6507f0c41663f6d08f497ab41893d8d9
com.apple.MailServiceAgentHelper.plist e6e6a7845b4e00806da7d5e264eed72b
com.apple.periodic-dd-mm-yy.plist bda470f4568dae8cb12344a346a181d9
com.apple.systemkeychain-helper.plist fd7b1215f03ed1221065ee4508d41de3
com.apple.watchproc.plist af772d9cca45a13ca323f90e7d874c2c
FontMap1.cfg 204b4836a9944d0f19d6df8af3c009d5
foundation 0ff51cd5fe0f88f02213d6612b007a45
globalupdate 9037cf29ed485dae11e22955724a00e7
globalupdate 9037cf29ed485dae11e22955724a00e7
itunesupdate a8dfbd54da805d3c52afc521ab7b354b
libcrypto.1.0.0.dylib 4c5384d667215098badb4e850890127b
libcrypto.1.0.0.dylib 3b533eeb80ee14191893e9a73c017445
libiconv.2.dylib 94f9882f5db1883e7295b44c440eb44c
libiconv.2.dylib fac8ef9dabdb92806ea9b1fde43ad746
libimobiledevice.4.dylib c596adb32c143430240abbf5aff02bc0
libimobiledevice.4.dylib 5b0412e19ec0af5ce375b8ab5a0bc5db
libiodb.dylib bc3aa0142fb15ea65de7833d65a70e36
liblzma.5.dylib 5bdfd2a20123e0893ef59bd813b24105
liblzma.5.dylib 9ebf9c0d25e418c8d0bed2a335aac8bf
libplist.2.dylib 903cbde833c91b197283698b2400fc9b
libplist.2.dylib 109a09389abef9a9388de08f7021b4cf
libssl.1.0.0.dylib 49b937c9ff30a68a0f663828be7ea704
libssl.1.0.0.dylib ab09435c0358b102a5d08f34aae3c244
libusbmuxd.2.dylib e8e0663c7c9d843e0030b15e59eb6f52
libusbmuxd.2.dylib 9efb552097cf4a408ea3bab4aa2bc957
libxml2.2.dylib 34f14463f28d11bd0299f0d7a3985718
libxml2.2.dylib 95506f9240efb416443fcd6d82a024b9
libz.1.dylib 28ef588ba7919f751ae40719cf5cffc6
libz.1.dylib f2b19c7a58e303f0a159a44d08c6df63
libzip.2.dylib 2a42736c8eae3a4915bced2c6df50397
machook 5b43df4fac4cac52412126a6c604853c
machook ecb429951985837513fdf854e49d0682
periodicdate aa6fe189baa355a65e6aafac1e765f41
pphelper 2b79534f22a89f73d4bb45848659b59b
sfbase.dylib bc3aa0142fb15ea65de7833d65a70e36

sfbase.dylib bc3aa0142fb15ea65de7833d65a70e36
sfbase_v4000.dylib 582fcd682f0f520e95af1d0713639864
sfbase_v4001.dylib e40de392c613cd2f9e1e93c6ffd05246
start e3a61139735301b866d8d109d715f102
start e3a61139735301b866d8d109d715f102
start.sh 3fa4e5fec53dfc9fc88ced651aa858c6
stty5.11.pl dea26a823839b1b3a810d5e731d76aa2
stty5.11.pl dea26a823839b1b3a810d5e731d76aa2
systemkeychain-helper e03402006332a6e17c36e569178d2097
watch.sh 358c48414219fdbbbbcff90c97295dff
WatchProc a72fdbacfd5be14631437d0ab21ff960
7b9e685e89b8c7e11f554b05cdd6819a 7b9e685e89b8c7e11f554b05cdd6819a
update 93658b52b0f538c4f3e17fdf3860778c
start.sh 9adfd4344092826ca39bbc441a9eb96f

File listing

├───databases

│ foundation

│

├───dropped

│ ├───version_A

│ │ │ com.apple.globalupdate.plist

│ │ │ com.apple.machook_damon.plist

│ │ │ globalupdate

│ │ │ machook

│ │ │ sfbase.dylib

│ │ │ watch.sh

│ │ │

│ │ ├───dylib

│ │ │ libcrypto.1.0.0.dylib

│ │ │ libiconv.2.dylib

│ │ │ libimobiledevice.4.dylib

│ │ │ liblzma.5.dylib

│ │ │ libplist.2.dylib

│ │ │ libssl.1.0.0.dylib

│ │ │ libusbmuxd.2.dylib

│ │ │ libxml2.2.dylib

│ │ │ libz.1.dylib

│ │ │

│ │ ├───log

│ │ └───update

│ ├───version_B

│ │ com.apple.globalupdate.plist

│ │ com.apple.itunesupdate.plist

│ │ com.apple.machook_damon.plist

│ │ com.apple.watchproc.plist

│ │ globalupdate

│ │ itunesupdate

│ │ machook

│ │ start

│ │ WatchProc

│ │

│ └───version_C

│ │ com.apple.appstore.plughelper.plist

│ │ com.apple.appstore.PluginHelper

│ │ com.apple.MailServiceAgentHelper

│ │ com.apple.MailServiceAgentHelper.plist

│ │ com.apple.periodic-dd-mm-yy.plist

│ │ com.apple.systemkeychain-helper.plist

│ │ periodicdate

│ │ stty5.11.pl

│ │ systemkeychain-helper

│ │

│ └───manpath.d

│ libcrypto.1.0.0.dylib

│ libiconv.2.dylib

│ libimobiledevice.4.dylib

│ libiodb.dylib

│ liblzma.5.dylib

│ libplist.2.dylib

│ libssl.1.0.0.dylib

│ libusbmuxd.2.dylib

│ libxml2.2.dylib

│ libz.1.dylib

│ libzip.2.dylib

│

├───iOS

│ sfbase.dylib

│ sfbase_v4000.dylib

│ sfbase_v4001.dylib

│ start

│ stty5.11.pl

│

├───IPAs

│ 7b9e685e89b8c7e11f554b05cdd6819a

│ pphelper

│

├───original

│ BikeBaron

│ CleanApp

│ FontMap1.cfg

│ start.sh

│

└───update

start.sh

update

SGIA Eagles' Nest

Friday, May 22, 2020

New DNS Vulnerability Lets Attackers Launch Large-Scale DDoS Attacks

Related word

[Guide] Finding Best Security Outsourcing Alternative For Your Organization

Related word

Thursday, May 21, 2020

Discover: A Custom Bash Scripts Used To Perform Pentesting Tasks With Metasploit

Related news

NcN 2015 CTF - theAnswer Writeup

Related posts

Wednesday, May 20, 2020

How Do I Get Started With Bug Bounty ?

Related word

CloudFrunt - A Tool For Identifying Misconfigured CloudFront Domains

Related links

How To Install Metasploit In Termux

Related news

Wirelurker For OSX, iOS (Part I) And Windows (Part II) Samples

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