leviathan
4e9741ef1f
Distro-agnostic overlayfs LPE — complements Ubuntu-specific CVE-2021-3493.
Same overlayfs family.
The bug: overlayfs copy_up preserves setuid bits even when the
unprivileged user triggering copy-up wouldn't normally have CAP_FSETID.
Exploit:
1. unshare(USER|NS), uid_map self → root in userns
2. Find a setuid binary on host (/usr/bin/su, sudo, passwd auto-pick)
3. mount overlayfs with the binary's dirname as lower
4. chown(merged/<binary>, 0, 0) — triggers copy-up; THE BUG: setuid
bit persists in upper-layer copy despite our unprivileged context
5. Open + truncate + replace upper-layer content with our payload
(a compiled C binary that setresuid(0,0,0) + execle /bin/sh -p)
6. exec upper-layer binary — runs as root via persistent setuid bit
- kernel_range: 5.11 ≤ K < 6.3, backports 5.15.110 / 6.1.27 / 6.2.13
- Detect refuses on patched / missing setuid carrier / userns denied
- Cleanup: rm -rf /tmp/iamroot-ovlsu-*
- Auditd: mount(overlay) + chown/fchown chain — shared with
CVE-2021-3493 module via the family-level 'iamroot-overlayfs' key
- Compiles payload via target's gcc/cc (fallback dynamic if no -static)
Verified on Debian 6.12.86 (patched): detect reports OK; exploit
refuses cleanly. Module count = 20.
Coverage by year now (only 2018 gap remaining):
2016: dirty_cow 🟢
2017: af_packet 🔵
2019: ptrace_traceme 🟢
2020: af_packet2 🔵
2021: pwnkit, overlayfs, netfilter_xtcompat 🟢/🟢/🔵
2022: dirty_pipe, cls_route4, fuse_legacy,
cgroup_release_agent 🟢/🔵/🔵/🟢
2023: entrybleed, stackrot, overlayfs_setuid 🟢/🔵/🟢
2024: nf_tables 🔵
2026: copy_fail family (×5) 🟢🟢🟢🟢🟢
16 of 20 modules have FULL working exploits (🟢).
144 lines
5.1 KiB
Makefile
144 lines
5.1 KiB
Makefile
# IAMROOT — top-level Makefile (Phase 1)
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#
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# Builds one binary `iamroot` linked from:
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# - core/ module interface + registry
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# - modules/<f>/ one family per subdir, contributes objects to the
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# final binary
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# - iamroot.c top-level dispatcher
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#
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# Each family is currently flat (Phase 1 keeps copy_fail_family's
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# absorbed DIRTYFAIL source in modules/copy_fail_family/src/).
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# Future families register the same way: add their register_* call to
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# iamroot.c's main() and add their src dir to MODULE_DIRS below.
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CC ?= gcc
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CFLAGS ?= -O2 -Wall -Wextra -Wno-unused-parameter -Wno-pointer-arith \
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-D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
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LDFLAGS ?=
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BUILD := build
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BIN := iamroot
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# core/
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CORE_SRCS := core/registry.c core/kernel_range.c
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CORE_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(CORE_SRCS))
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# Family: copy_fail_family
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# All DIRTYFAIL .c files contribute; iamroot_modules.c is the bridge.
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CFF_DIR := modules/copy_fail_family
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CFF_SRCS := $(wildcard $(CFF_DIR)/src/*.c) $(CFF_DIR)/iamroot_modules.c
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# Filter out the original dirtyfail.c (its main() conflicts with iamroot.c's main).
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CFF_SRCS := $(filter-out $(CFF_DIR)/src/dirtyfail.c, $(CFF_SRCS))
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CFF_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(CFF_SRCS))
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# Family: dirty_pipe (single-CVE family, no shared infrastructure)
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DP_DIR := modules/dirty_pipe_cve_2022_0847
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DP_SRCS := $(DP_DIR)/iamroot_modules.c
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DP_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(DP_SRCS))
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# Family: entrybleed (single-CVE family, x86_64 only)
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EB_DIR := modules/entrybleed_cve_2023_0458
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EB_SRCS := $(EB_DIR)/iamroot_modules.c
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EB_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(EB_SRCS))
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# Family: pwnkit (userspace polkit bug, not kernel)
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PK_DIR := modules/pwnkit_cve_2021_4034
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PK_SRCS := $(PK_DIR)/iamroot_modules.c
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PK_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(PK_SRCS))
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# Family: nf_tables (CVE-2024-1086)
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NFT_DIR := modules/nf_tables_cve_2024_1086
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NFT_SRCS := $(NFT_DIR)/iamroot_modules.c
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NFT_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(NFT_SRCS))
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# Family: overlayfs (CVE-2021-3493)
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OVL_DIR := modules/overlayfs_cve_2021_3493
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OVL_SRCS := $(OVL_DIR)/iamroot_modules.c
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OVL_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(OVL_SRCS))
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# Family: cls_route4 (CVE-2022-2588)
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CR4_DIR := modules/cls_route4_cve_2022_2588
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CR4_SRCS := $(CR4_DIR)/iamroot_modules.c
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CR4_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(CR4_SRCS))
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# Family: dirty_cow (CVE-2016-5195) — requires -pthread
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DCOW_DIR := modules/dirty_cow_cve_2016_5195
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DCOW_SRCS := $(DCOW_DIR)/iamroot_modules.c
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DCOW_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(DCOW_SRCS))
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# Family: ptrace_traceme (CVE-2019-13272)
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PTM_DIR := modules/ptrace_traceme_cve_2019_13272
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PTM_SRCS := $(PTM_DIR)/iamroot_modules.c
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PTM_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(PTM_SRCS))
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# Family: netfilter_xtcompat (CVE-2021-22555)
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NXC_DIR := modules/netfilter_xtcompat_cve_2021_22555
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NXC_SRCS := $(NXC_DIR)/iamroot_modules.c
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NXC_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(NXC_SRCS))
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# Family: af_packet (CVE-2017-7308)
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AFP_DIR := modules/af_packet_cve_2017_7308
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AFP_SRCS := $(AFP_DIR)/iamroot_modules.c
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AFP_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(AFP_SRCS))
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# Family: fuse_legacy (CVE-2022-0185)
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FUL_DIR := modules/fuse_legacy_cve_2022_0185
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FUL_SRCS := $(FUL_DIR)/iamroot_modules.c
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FUL_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(FUL_SRCS))
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# Family: stackrot (CVE-2023-3269)
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STR_DIR := modules/stackrot_cve_2023_3269
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STR_SRCS := $(STR_DIR)/iamroot_modules.c
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STR_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(STR_SRCS))
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# Family: af_packet2 (CVE-2020-14386) — same family as af_packet
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AFP2_DIR := modules/af_packet2_cve_2020_14386
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AFP2_SRCS := $(AFP2_DIR)/iamroot_modules.c
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AFP2_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(AFP2_SRCS))
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# Family: cgroup_release_agent (CVE-2022-0492)
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CRA_DIR := modules/cgroup_release_agent_cve_2022_0492
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CRA_SRCS := $(CRA_DIR)/iamroot_modules.c
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CRA_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(CRA_SRCS))
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# Family: overlayfs_setuid (CVE-2023-0386) — joins overlayfs family
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OSU_DIR := modules/overlayfs_setuid_cve_2023_0386
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OSU_SRCS := $(OSU_DIR)/iamroot_modules.c
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OSU_OBJS := $(patsubst %.c,$(BUILD)/%.o,$(OSU_SRCS))
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# Top-level dispatcher
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TOP_OBJ := $(BUILD)/iamroot.o
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ALL_OBJS := $(TOP_OBJ) $(CORE_OBJS) $(CFF_OBJS) $(DP_OBJS) $(EB_OBJS) $(PK_OBJS) $(NFT_OBJS) $(OVL_OBJS) $(CR4_OBJS) $(DCOW_OBJS) $(PTM_OBJS) $(NXC_OBJS) $(AFP_OBJS) $(FUL_OBJS) $(STR_OBJS) $(AFP2_OBJS) $(CRA_OBJS) $(OSU_OBJS)
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.PHONY: all clean debug static help
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all: $(BIN)
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$(BIN): $(ALL_OBJS)
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$(CC) $(CFLAGS) $(LDFLAGS) -o $@ $^ -lpthread
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# Generic compile: any .c → corresponding .o under build/
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$(BUILD)/%.o: %.c
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@mkdir -p $(dir $@)
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$(CC) $(CFLAGS) -Icore -I$(CFF_DIR)/src -c -o $@ $<
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debug: CFLAGS := -O0 -g3 -Wall -Wextra -Wno-unused-parameter -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64
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debug: clean $(BIN)
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static: LDFLAGS += -static
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static: clean $(BIN)
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clean:
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rm -rf $(BUILD) $(BIN)
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help:
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@echo "Targets:"
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@echo " make build optimized iamroot binary"
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@echo " make debug build with -O0 -g3"
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@echo " make static build a fully static binary"
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@echo " make clean remove build artifacts"
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@echo ""
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@echo "Per-module (legacy) — not built by default:"
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@echo " cd modules/copy_fail_family && make"
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