[announce] Next NYC*BUG: Weird Code Injection Techniques on FreeBSD With libhijack.pdf, Shawn Webb 2026-03-04

[NYC*BUG Announcements]

- Weird Code Injection Techniques on FreeBSD With libhijack.pdf remote
presentation, Shawn Webb
2026-03-04 @ 18:45 local (23:45 UTC) - Backroom of Brass Monkey 55 Little
West 12th St
Remote participation: Plans are to stream via NYC*BUG website. Q&A will be
via IRC on libera.chat channel #nycbug - please preface your questions with
'[Q]'.

FreeBSD is a widely-used open source operating system, powering your
Playstation 4 and 5, Netflix, Juniper dev ices, and many other devices.
libhijack is a post-exploitation tool to make code injection easier. In as
littl e as four lines of code, developers can inject a complete shared
object into another process fully anonymously.

libhijack makes it easy to force the target process to create new anonymous
memory mappings, inject code into memory-backed file descriptors, and
finally call fdlopen on the memfd.

This presentation walks attendees through various methods in which to
stealthily inject code into a target pro cess–some of these methods are new
variants of prior work and remain unique to libhijack.

Shawn Webb is the co-founder of the HardenedBSD Project and the founding
president of The HardenedBSD Foundati on, a tax-exmpt not-for-profit 501©3
charitable organization in the US. While Shawn has a few decades of exp
erience in infosec, both as a profession and a hobby, he considers himself
a perpetual newb. He works for IOAc tive, an offensive security company,
spending his time finding vulnerabilities in customer products.

While working in the NSA’s backyard, he had the opportunity to be mentored
by two interns–an experience that changed his life. He and his interns
focused on the intersection of human rights and information security and
cybersecurity.

Shawn “lattera” Webb also maintains a post-exploitation tool called
libhijack. It makes runtime process infect ion and runtime function hooking
for remote processes over the ptrace boundary incredibly simple on FreeBSD.

Nearest NYC Subway is the 14th Street/Eighth Avenue station L, A, C, E.

To get to the backroom, you must enter the front door, follow the long bar
on your left, and walk all the way to the back. At the rear of the
BrassMonkey, you will see an alcove for the 3 bathrooms our room is off to
your right.
More Info: https://www.nycbug.org/
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