leviathan
9593d90385
Breaking change. Tool name, binary name, function/type names,
constant names, env vars, header guards, file paths, and GitHub
repo URL all rebrand IAMROOT → SKELETONKEY.
Changes:
- All "IAMROOT" → "SKELETONKEY" (constants, env vars, enum
values, docs, comments)
- All "iamroot" → "skeletonkey" (functions, types, paths, CLI)
- iamroot.c → skeletonkey.c
- modules/*/iamroot_modules.{c,h} → modules/*/skeletonkey_modules.{c,h}
- tools/iamroot-fleet-scan.sh → tools/skeletonkey-fleet-scan.sh
- Binary "iamroot" → "skeletonkey"
- GitHub URL KaraZajac/IAMROOT → KaraZajac/SKELETONKEY
- .gitignore now expects build output named "skeletonkey"
- /tmp/iamroot-* tmpfiles → /tmp/skeletonkey-*
- Env vars IAMROOT_MODPROBE_PATH etc. → SKELETONKEY_*
New ASCII skeleton-key banner (horizontal key icon + ANSI Shadow
SKELETONKEY block letters) replaces the IAMROOT banner in
skeletonkey.c and README.md.
VERSION: 0.3.1 → 0.4.0 (breaking).
Build clean on Debian 6.12.86. `skeletonkey --version` → 0.4.0.
All 24 modules still register; no functional code changes — pure
rename + banner refresh.
26 lines
918 B
Markdown
26 lines
918 B
Markdown
# NOTICE — overlayfs (CVE-2021-3493)
|
|
|
|
## Vulnerability
|
|
|
|
**CVE-2021-3493** — Ubuntu overlayfs userns file-capability injection
|
|
→ host root via setcap'd binaries in a userns-mounted overlay.
|
|
|
|
## Research credit
|
|
|
|
Reported by **Vasily Kulikov**, April 2021. Ubuntu-specific because
|
|
upstream didn't enable unprivileged userns-overlayfs-mount until 5.11.
|
|
|
|
Advisory: USN-4915-1 / USN-4916-1 (Canonical, April 2021).
|
|
|
|
Public PoC: vsh-style userns + overlayfs + xattr injection chain.
|
|
|
|
## SKELETONKEY role
|
|
|
|
Detect parses `/etc/os-release` for `ID=ubuntu`, checks
|
|
`unprivileged_userns_clone` sysctl, and with `--active` performs the
|
|
mount as a fork-isolated probe. The full exploit performs the
|
|
userns+overlayfs mount, plants a setcap'd carrier binary in the
|
|
upper layer, and execs it from the unprivileged side to obtain root
|
|
on the host. Ships auditd rules covering `mount(overlay)` and
|
|
`setxattr(security.capability)`.
|