There were two difficult Web questions this time. I solved one, and the other one was unsolvable, but the solution is worth a look. Here’s a brief summary.
There were two difficult Web questions this time. I solved one, and the other one was unsolvable, but the solution is worth a look. Here’s a brief summary.
If you want to generate a new window on a webpage, there are probably only two options: one is to embed resources on the same page using tags such as iframe, embed, and object, and the other is to use window.open to open a new window.
As a front-end developer, I believe that everyone is familiar with these. You may have used iframe to embed third-party web pages or widgets, or used window.open to open a new window and communicate with the original window through window.opener.
However, from a security perspective, there are many interesting things about iframes, which often appear in the real world or in CTF competitions. Therefore, I want to record some of the features I learned recently through this article.
ERPNext is a very popular open-source ERP(Enterprise Resource Planning) software built on Frappe Framework.
Last December, we found two vulnerabilities in the latest version of ERPNext: SSRF(Server-Side Request Forgery) and account takeover via XSS. Both vulnerabilities require a low-privileged authenticated user to perform the attack.
By exploiting SSRF, a malicious actor could steal the credentials from cloud metadata and may lead to RCE. For XSS, it’s possible to take over others’ accounts.
We reported both vulnerabilities on November 25th, 2021. At the time of writing, there is still no fix for those two issues, so we decided to publish the details to inform the public about the risk.
Amelia is a WordPress plugin developed by TMS that allows you to easily add a booking system to your WordPress website, such as for clinics, hair salons, or tutoring, making it ideal for setting up a simple reservation system. According to official WordPress statistics, approximately 40,000 websites have installed this plugin.
In early March, I conducted some research on the source code of the Amelia system and found three vulnerabilities that all involve sensitive information disclosure:
CVE-2022-0720 Amelia < 1.0.47 - Customer+ Arbitrary Appointments Update and Sensitive Data Disclosure (CVSS 6.3)CVE-2022-0825 Amelia < 1.0.49 - Customer+ Arbitrary Appointments Status Update (CVSS 6.3)CVE-2022-0837 Amelia < 1.0.48 - Customer+ SMS Service Abuse and Sensitive Data Disclosure (CVSS 5.4)If attackers exploit these vulnerabilities, they can obtain all consumer data, including names, phone numbers, and reservation information.
Below, I will briefly introduce the architecture of Amelia and the details of these three vulnerabilities.
Amelia is a WordPress plugin for booking systems developed by TNS. With 40,000+ active installations, it has been used for the clinic, hair salon, tutor, and so on.
In March, we studied the source code of Amelia and found three vulnerabilities in the end:
CVE-2022-0720 Amelia < 1.0.47 - Customer+ Arbitrary Appointments Update and Sensitive Data Disclosure (CVSS 6.3)CVE-2022-0825 Amelia < 1.0.49 - Customer+ Arbitrary Appointments Status Update (CVSS 6.3)CVE-2022-0837 Amelia < 1.0.48 - Customer+ SMS Service Abuse and Sensitive Data Disclosure (CVSS 5.4)By exploiting these vulnerabilities, a malicious actor could get all the customer’s data, including name, phone, and booking details.
In this article, I will talk about the code structure of Amelia and the details of three vulnerabilities.
I participated in LINE CTF 2022 with the team Water Paddler and we ranked seventh with the help of my teammates. I only contributed to one question, while the others were solved by my teammates or stuck. This article briefly summarizes the solutions to each question, most of which are referenced from LINE CTF 2022 Writeups by maple3142.
Last weekend, in addition to the SUSCTF 2022 I wrote about in my previous post, there was also another TSJ CTF with many good challenges. Due to time constraints, I only chose the ones that interested me more, and this is the Nim Notes challenge mentioned in the title. I didn’t manage to solve it in the end (I was far from it), but the solution was very interesting, so I’m writing this post to record the official solution.
The author’s (maple3142) writeup is here: https://github.com/maple3142/My-CTF-Challenges/tree/master/TSJ%20CTF%202022/Nim%20Notes
This holiday there were several CTFs, and I participated in SUSCTF 2022 with team SU. This post briefly records my experience with several of the challenges I participated in.
The list of challenges I will discuss is as follows:
In May 2021, I solved my first Intigriti XSS challenge. Since then, I play every XSS challenge afterward, and solved most of them. Sometimes it’s painful when you try everything you know but still can’t solve it, however, the moment you made it, the pain is gone, replaced with joy and happiness.
As a player, I want to be on the other end(as a challenge maker) at least once, if I have an idea of an interesting XSS challenge.
I talked to @PinkDraconian in Jan 2021 and share an XSS challenge I created, after a few discussions, it gets accepted. This write-up is about the story behind the challenge.
If you don’t know what CTF is, you can refer to my previous article: How to Get Started with Web Challenges in CTF?, which briefly introduces what CTF is and some basic types of challenges.
I played DiceCTF 2021 seriously last year and finally solved 6 web challenges. My experience is here: DiceCTF 2021 - Summary. I took a look at this year’s DiceCTF and was completely shocked. The difficulty level is completely different.
There are a total of 10 web challenges this time, with 1 easy challenge solved by 365 teams, another relatively simple one solved by 75 teams, and the other 8 challenges solved by only 5 teams or less, with one of them unsolved.
As a person who likes web and JS-related tips, this is a great learning opportunity to learn various techniques through the writeup released after the competition. There won’t be notes on all web challenges below, only the ones I’m interested in.