Hello, I'm Nikos Sampanis, a security researcher working at CENSUS. On February 16th, 2018 I presented at OffensiveCon a talk with the title
"Windows 10 RS2/RS3 GDI data-only exploitation tales". The presentation focused on a
mitigation introduced in the Win32k component of Microsoft Windows to prevent the exploitation of memory
corruptions in the session heap (due to GDI object abuse).
CENSUS is proud to announce its participation in OffensiveCon 2018 as a Silver Sponsor.
On December 27th 2017 I presented at the 34th Chaos Communication Congress (34C3) a talk on the technical details and the process of reverse engineering and re-implementation of the evasi0n7 jailbreak's main kernel exploit, titled "iOS kernel exploitation archaeology". Actually, I gave the same talk at the WarCon private event earlier in 2017 (June), but since there were no proceedings or slides published there, I thought it would be a good talk for 34C3!
Both events, 34C3 and WarCon, were very well organized, but also very different both in content and of course size. Many thanks to the organizers and volunteers of both these awesome European conferences!
About four months ago (April 2017), Vasilis Tsaousoglou and myself presented our work on exploiting Android's libc allocator at the 2017 INFILTRATE conference (Miami, Florida). Since version 5.0, Android has adopted the jemalloc allocator as its default libc malloc(3) implementation. For our talk we extended our previously released jemalloc heap exploration and exploitation tool called 'shadow' to support Android (both ARM32 and ARM64), and demonstrated its use on understanding the impact of libc heap corruption vulnerabilities. We also presented new jemalloc/Android-specific exploitation techniques for double free and arbitrary free vulnerabilities.