TL;DR By flipping the R/W bit in the page table entry of a mapped file (e.g., /etc/passwd), you can gain write access to the file. What is Dirty Pagetable What is Dirty Pageflags Flipping R/W PoC Conclusion What is Dirty Pagetable Dirty Pa…

I participated in the Midnight Flag CTF 2025 qualification round as a member of BunkyoWesterns. This CTF features an onsite finals event that will be held in France. We managed to secure 3rd place, so it looks like we’ll be heading to the …

I got a cold last weekend and spent my free time playing KalmarCTF 2025 in BunkyoWesterns to boost my immune system. It's been a long time since I last posted a writeup. I've been busy to write an article, but I felt I needed to do it beca…