leviathan/SKELETONKEY
1
0
Fork 0
Code Issues Pull Requests Actions 21 Packages Projects Releases Wiki Activity

Phase 7: nf_tables CVE-2024-1086 + active probe for dirty_pipe

Browse Source 
dirty_pipe detect: active sentinel probe (Phase 1.5-ish improvement)
- New dirty_pipe_active_probe(): creates a /tmp probe file with known
  sentinel bytes, fires the Dirty Pipe primitive against it, re-reads
  via the page cache, returns true if the poisoning landed.
- detect() gated on ctx->active_probe: --scan does version-only check
  (fast, no side effects); --scan --active fires the empirical probe
  and overrides version inference with the empirical verdict. Catches
  silent distro backports that don't bump uname() version.
- Three verdicts now distinguishable:
  (a) version says patched, no active probe → 'patched (version-only)'
  (b) version says vulnerable, --active fires + probe lands → CONFIRMED
  (c) version says vulnerable, --active fires + probe blocked → 'likely
      patched via distro backport'
- Probe is safe: only /tmp, no /etc/passwd.

nf_tables CVE-2024-1086 (detect-only, new module):
- Famous Notselwyn UAF in nft_verdict_init. Affects 5.14 ≤ K, fixed
  mainline 6.8 with backports landing in 5.4.269 / 5.10.210 / 5.15.149
  / 6.1.74 / 6.6.13 / 6.7.2.
- detect() checks: kernel version range, AND unprivileged user_ns clone
  availability (the exploit's reachability gate — kernel-vulnerable
  but userns-locked-down hosts report PRECOND_FAIL, signalling that
  the kernel still needs patching but unprivileged path is closed).
- Ships auditd + sigma detection rules: unshare(CLONE_NEWUSER) chained
  with setresuid(0,0,0) on a previously-non-root process is the
  exploit's canonical telltale.
- Full Notselwyn-style exploit (cross-cache UAF → arbitrary R/W → cred
  overwrite or modprobe_path hijack) is the next commit.

9 modules total now. CVES.md and ROADMAP.md updated.
This commit is contained in:
KaraZajac
2026-05-16 20:19:11 -04:00
parent f1bd896ca8
commit a4b7238e4a
8 changed files with 350 additions and 13 deletions
Download Patch File Download Diff File Expand all files Collapse all files
CVES.md
+2 -1
View File
@@ -23,10 +23,11 @@ Status legend:
| CVE-2026-43284 (v6) | Dirty Frag — IPv6 xfrm-ESP (`esp6`) | LPE | mainline 2026-05-XX | `dirty_frag_esp6` | 🟢 | V6 STORE shift auto-calibrated per kernel build |
| CVE-2026-43500 | Dirty Frag — RxRPC page-cache write | LPE | mainline 2026-05-XX | `dirty_frag_rxrpc` | 🟢 | |
| (variant, no CVE) | Copy Fail GCM variant — xfrm-ESP `rfc4106(gcm(aes))` page-cache write | LPE | n/a | `copy_fail_gcm` | 🟢 | Sibling primitive, same fix |
| CVE-2022-0847 | Dirty Pipe — pipe `PIPE_BUF_FLAG_CAN_MERGE` write | LPE (arbitrary file write into page cache) | mainline 5.17 (2022-02-23) | `dirty_pipe` | 🟢 | Full detect + exploit + cleanup. Detect: branch-backport ranges (5.10.102 / 5.15.25 / 5.16.11 / 5.17+). Exploit: page-cache write into /etc/passwd UID field followed by `su` to drop a root shell. Auto-refuses on patched kernels. Cleanup: drop_caches + POSIX_FADV_DONTNEED. CI-validation against a vulnerable kernel (e.g. Ubuntu 20.04 with stock 5.13) is Phase 4 work. |
| CVE-2022-0847 | Dirty Pipe — pipe `PIPE_BUF_FLAG_CAN_MERGE` write | LPE (arbitrary file write into page cache) | mainline 5.17 (2022-02-23) | `dirty_pipe` | 🟢 | Full detect + exploit + cleanup. Detect: branch-backport ranges + **active sentinel probe** (`--active` fires the primitive against a /tmp probe file and verifies the page cache poisoning lands — catches silent distro backports the version check misses). Exploit: page-cache write into /etc/passwd UID field followed by `su` to drop a root shell. Auto-refuses on patched kernels. Cleanup: drop_caches + POSIX_FADV_DONTNEED. |
| CVE-2023-0458 | EntryBleed — KPTI prefetchnta KASLR bypass | INFO-LEAK (kbase) | mainline (partial mitigations only) | `entrybleed` | 🟢 | Stage-1 leak brick. Working on lts-6.12.86 (verified 2026-05-16 via `iamroot --exploit entrybleed --i-know`). Default `entry_SYSCALL_64` slot offset matches lts-6.12.x; override via `IAMROOT_ENTRYBLEED_OFFSET=0x...`. Other modules can call `entrybleed_leak_kbase_lib()` as a library. x86_64 only. |
| CVE-2026-31402 | NFS replay-cache heap overflow | LPE (NFS server) | mainline 2026-04-03 | — | ⚪ | Candidate. Different audience (NFS servers) — TBD whether in-scope. |
| CVE-2021-4034 | Pwnkit — pkexec argv[0]=NULL → env-injection | LPE (userspace setuid binary) | polkit 0.121 (2022-01-25) | `pwnkit` | 🟢 | Full detect + exploit (canonical Qualys-style: gconv-modules + execve NULL-argv). Detect handles both polkit version formats (legacy "0.105" + modern "126"). Exploit compiles payload via target's gcc → falls back gracefully if no cc available. Cleanup nukes /tmp/iamroot-pwnkit-* workdirs. **First userspace LPE in IAMROOT**. Ships auditd + sigma rules. |
| CVE-2024-1086 | nf_tables — `nft_verdict_init` cross-cache UAF | LPE (kernel arbitrary R/W via slab UAF) | mainline 6.8-rc1 (Jan 2024) | `nf_tables` | 🔵 | Detect-only. Branch-backport ranges checked (6.7.2 / 6.6.13 / 6.1.74 / 5.15.149 / 5.10.210 / 5.4.269). Also checks unprivileged user_ns clone availability (the exploit's trigger gate) — reports PRECOND_FAIL if userns is locked down even when the kernel is vulnerable. Full Notselwyn-style exploit is the next nf_tables commit. |
| CVE-TBD | Fragnesia (ESP shared-frag in-place encrypt) | LPE (page-cache write) | mainline TBD | `_stubs/fragnesia_TBD` | ⚪ | Stub. Per `findings/audit_leak_write_modprobe_backups_2026-05-16.md`, requires CAP_NET_ADMIN in userns netns — may or may not be in-scope depending on target environment. |
## Operations supported per module