As a Penetration Tester, there are many different things you come across while performing a test. These cookies are purposed for load balancing and if not properly protected, will reveal IP addresses and ports of internal servers.
From a security mindset, it is far from ideal to be handing out internal network information like this. The first step in decoding an F5 cookie is to identify it. The following response header is an example of an F5 cookie being set:. The name of the cookie will probably be slightly different, but is should be similar and the value will be 3 values separated by periods. The next step is to decode the cookie to identify the internal IP address and Port.
The above cookie translates to: IP Address: Although this manual method works, it is rather tedious. I found a reference to a python script that will decode the IP address for you. The first piece of functionality I added was to decode the port.
Then after thinking about it, I decided to add the ability to pass in multiple cookie values from a text file and have them decoded in bulk. The following image shows the script being executed using an input file containing multiple cookie values it just so happens the vales are all the same :.
If you do not want to reveal these internal IP addresses, F5 does provide instructions on how to encrypt the cookie value. This script decodes the IP and Port of an F5 cookie. It may contain some internal IP addresses that can be useful to an attacker. This should be brought to the attention of the client to determine the risk level of the information being revealed.
IO allows you to decode, verify and generate JWT. Learn more about jwt. Get the JWT Handbook for free! Download it now and get up-to-speed faster. Download Ebook. Debugger Warning: JWTs are credentials, which can grant access to resources. Be careful where you paste them! We do not record tokens, all validation and debugging is done on the client side.
Encoded paste a token here. Learn more. Sign Verify iss check sub check aud check exp check nbf check iat check jti check. View Repo. Install-Package System. Install-Package jose-jwt. Install-Package jose-rt. Kingcean Tuan. Install-Package Trivial.
BIGIP Cookie Decoder
Install-Package JWT. Yann Crumeyrolle. Install-Package JsonWebToken. Michael Davis. Simo Sorce. Hsiaoming Yang. Filip Skokan. Brian Campbell. Les Hazlewood. Kenji Urushima.
Square, Inc. Cisco Systems. Karel Miko. Nov Matake.I was going through my bookmarks and found a write-up from a few years ago on decoding NetScaler load balancer cookies. Adam Maxwell catalyst wrote a few blog posts describing his process of figuring out how to decode the cookie and finished it off by releasing a Python script that automates his process.
It's always interesting to me to see how other people approach and solve problems and the fact that it was about a web artifact made it even more so for me. I read Adam's post, followed some links and found related worksand learned more about load balancers in general. From that, the key points for me were:. While none of this information is earth-shattering, knowing that a website is utilizing a load balancer and finding the potentially internal IPs and ports in use can be handy.
I also just like being able to understand what's in a given cookie, if for no other reason that to rule out that the smoking gun is hiding there :. I had meant to create a Hindsight plugin utilizing Adam's code quite a while ago, but it fell through the cracks. Like most other Hindsight plugins, it puts the parsed information in the "Interpretation" field of the report. Most of the IPs I've seen are internal RFC addresses, which makes sense as generally the load balancer will have the external IP and the servers will not be internet-accessible directly.
Get Hindsight and the new plugin from Github. To use the new plugin, just run Hindsight as you normally would. Any load balancer cookies found will be automatically decoded. From that, the key points for me were: Load balancers can be configured to be "sticky".
This makes the load balancer send all requests for that session to the same physical server, rather than whatever server the load balancing algorithm would have chosen. This is useful for applications that maintain sessions, as just that one physical server has the session information. Otherwise it could be duplicated or otherwise distributed across some or all the physical servers.
This "stickiness" also known as persistence can be implemented in a number of ways, one of which is by setting a cookie. These cookies are often encoded or encrypted - sometimes not very robustly. When decoded, the cookies can contain information about the server infrastructure, including IPs, ports, and the service name. I also just like being able to understand what's in a given cookie, if for no other reason that to rule out that the smoking gun is hiding there : Hindsight Plugin: Load Balancer Cookie Decoder I had meant to create a Hindsight plugin utilizing Adam's code quite a while ago, but it fell through the cracks.
Load Balancer Cookies plugin output Most of the IPs I've seen are internal RFC addresses, which makes sense as generally the load balancer will have the external IP and the servers will not be internet-accessible directly.Ninja deathrun quiz code
Share this.The interesting thing about this load balancer was the cookie value:. As you can see the cookie value looks rather suspicious, lets see if we can reverse it! I came across the following page with a plethora of information regarding this particular cookie, it is well worth a read:. After reading that it was quite clear to me that the cookie value was an encoded IP and Port value.
Here is the code and an example run:. I am going to be coming back again to ur page before long. Thanks a lot -Wayne. You are commenting using your WordPress. You are commenting using your Google account. You are commenting using your Twitter account. You are commenting using your Facebook account. Notify me of new comments via email.
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Home About Downloads. I came across the following page with a plethora of information regarding this particular cookie, it is well worth a read: Overview of BIG-IP persistence cookie encoding After reading that it was quite clear to me that the cookie value was an encoded IP and Port value. Here is the code and an example run:! Share this: Email Facebook Twitter.
Flask Session Cookie Decoder
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Leave a Reply Cancel reply Enter your comment here Fill in your details below or click an icon to log in:. Email required Address never made public. Name required. Subscribe to Pentura Labs Subscribe in a reader. Post was not sent - check your email addresses! Sorry, your blog cannot share posts by email.GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together.
If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. If nothing happens, download the GitHub extension for Visual Studio and try again. This python script will take a Big-IP persistence cookie and decode the value.
This will allow you to determine the internal IP address es of a load balanced webserver. Typically, Big-IP cookies are composed by the BIGipServer prefix, the pool name and contain an encoded string internal IP address and port of the load-balanced web server. Skip to content.
Online decrypt tool
Dismiss Join GitHub today GitHub is home to over 40 million developers working together to host and review code, manage projects, and build software together. Sign up. A script to easily decode the Big IP cookies.
Code it yourself - nobody's gonna do it 4 you. Use Google.
Posted 08 February - PM. Guests Reputation: 0. Usually cookies are encrypted in various different encryption schemes so taking a stab and "decoding" a cookie would probably be your best bet. However, I doubt you can make a decryption routine that has the capability to decide which algorithm to use and still be able to decrypt it into concise and readable text.
P f28last BBS in vancouver. In the address bar works for IE and I'm not sure what elsetype: java script:alert document. Websites usually md5 passwords, and all the other garble isn't necessary depending on what you are doing. Sic vis pacum para bellum. If you want peace, prepare for war. Join the Army; travel to exotic, distant lands; meet exciting, unusual people and kill them. Posted 04 March - AM.
I need a tool for decode itI looked for it by google but see nothing about it somebody can help me? NO google it. Posted 05 March - AM. Thanks too knarf.Dua qunoot bangla mane
Base64 encoding schemes are generally used when there is a need to encode binary information that needs to be stored and transferred over media that are developed to deal with textual information.
This guarantees that the data stays unchanged without modification during transfer. The specific set of characters chosen for the 64 characters needed for the base can vary among implementations. The common concept is to select a set of 64 characters that is both part of a subset typical to most encodings. This mixture leaves the data impossible to be altered in transportation thru information systems, such as electronic mail, that were typically not 8-bit clean.
Other Base64 variations share the same property but they use different symbols in the last two values. FromBase64String C System. FromBase64String Java decode. All rights reserved.
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